I am a geologist, graduated from the University of Iceland, and taught geology for a few years. I have gained some knowledge about Earth's inner structure, so I provide this website as my contribution to answer one of the greatest questions remaining within the realm of geoscience. Experiments show that the mantle should form convection rolls when close to the melting point. I took this literally, and calculated the dimensions and shape of these mantle convection rolls. Then I compare that model with the surface. This makes it possible to provide many interesting examples about geology found on my blog.
Three well-known volcanic and geothermal sites in the northwestern part of the Ring of Fire—Mount Fuji, Changbaishan, and the Valley of Geysers in Kamchatka—occupy very different positions within the geometrical framework considered here.
Map showing a section of the Ring of Fire, the convection-roll division lines, and the locations of Changbaishan, Mount Fuji, and the Valley of Geysers.
In the accompanying map, the inner and outer boundaries of the Ring of Fire are shown in red, while the calculated mantle-convection-roll divisions are shown as black lines.
Changbaishan is located close to the outer boundary of the Ring of Fire. At the same time, it lies within the region where the proposed Indian Ocean Ring overlaps the Pacific Ring. Its position can therefore be examined in relation to the interaction between two large-scale tectonic systems rather than to the Pacific Ring alone.
Mount Fuji, by contrast, is situated close to a calculated division between two large-scale lower-mantle convection rolls. It also marks the northern end of the Izu–Bonin subduction system, which follows this calculated mantle division southwards. Fuji therefore provides a particularly clear example of a volcanic centre associated directly with the geometry of the mantle convection roll system.
The Valley of Geysers in Kamchatka occupies yet another type of position. It lies close to the inner boundary of the Ring of Fire and also near a major N–S axis that can be regarded as an extension of the minor axis of the Antarctic ellipse.
This same meridional direction continues through the longitude of the Geysir geothermal area in Iceland. When viewed relative to the geographic poles, the Iceland–Kamchatka direction forms an approximately 90° relationship with Yellowstone. The three major geyser regions therefore occupy geometrically related positions within the broader global framework, although the immediate tectonic setting of each is different.
These three examples illustrate an important point. Exceptional volcanic or geothermal activity need not correspond to only one kind of geometrical relationship. In this case:
Changbaishan is associated with the overlap of two proposed tectonic rings;
Mount Fuji is associated with a major lower-mantle convection-roll division and the beginning of the Izu–Bonin subduction system;
the Valley of Geysers is associated with the inner boundary of the Ring of Fire and a major meridional axis linked geometrically with Antarctica.
The locations can therefore be examined as different surface expressions of the same broader tectonic framework.
After the mantle convection roll system had been analysed, a number of secondary relationships became easier to recognize. The geometry of the Ring of Fire became more comprehensible, and extrapolation of its form led to the hypothesis that the Ring of Fire may represent only one of three adjacent large-scale tectonic systems of comparable dimensions surrounding the Earth.
Arrangement according to Ring of Fire, extrapolated.
An important clue was that the dimensions of the Ring of Fire could be defined by its span across the equatorial region and then traced away from the equator. The inner boundary was found to span 120°, from approximately 146°E to 94°W. This suggested a simple possibility: the Pacific Ring may occupy one of three approximately equal 120° sectors around the globe, with comparable tectonic rings associated with the Atlantic and Indian Oceans.
The outer boundary of the Ring of Fire is somewhat more difficult to define. A first approximation suggests a span of about 150°, but comparison with major tectonic structures indicates that the effective width may be somewhat greater. Features such as the Kermadec–Tonga system, and particularly the Red Sea, provide important constraints on the position of the outer boundaries of these large-scale elliptical tectonic forms.
Africa as a Test of the Geometry
Africa provides a useful example of how major tectonic structures correspond to this geometrical duplication of the Ring of Fire.
Africa and the Mediterranean Ocean.
The Red Sea follows the orientation of the proposed outer ellipse remarkably closely. In the present mathematical construction, the ellipse is centred at approximately 29.3°W, 6.0°S, with minor and major axis lengths of 71 and 96.5 units, respectively, and is rotated by 45°, corresponding to a slope of −1 in the planar representation. The corresponding inner ellipse has minor and major axis lengths of 51.8 and 77.7 units.
Simplified tectonic map from Wikipedia.
The major-axis direction of the outer ellipse also extends mathematically close to the South Pole, linking the geometry of the oceanic rings with the Antarctic system.
A Six-Part Global Arrangement
Although three elliptical tectonic rings are identified, the complete arrangement can also be viewed as a six-part system, because each ellipse consists of two opposing halves.
This introduces an interesting comparison with hexagonal geometry. In a regular hexagon, each side has the same length as the radius of the circumscribed circle. Sixfold arrangements are also common in physical systems where comparable units are distributed around a centre.
The possible relationship with the mantle convection roll system therefore deserves examination. If the tectonic arrangement is divided into six principal sectors, the positions of the convection-roll divisions can be compared with the boundaries between these sectors. However, the numerical relationship between the number of rolls and the six sectors should be treated separately and tested precisely rather than assumed from the geometry alone.
Width of the Tectonic Rings at the Equator
The western boundary of each outer ellipse appears to be closely related to a principal equatorial upwelling node, while the corresponding inner boundary shows a similar relationship to a downwelling node.
The tectonic boundaries do not coincide exactly with these theoretical points. The outer and inner limits appear to lie slightly to the west and east of them, respectively. This displacement may be significant, particularly where subduction systems extend several degrees beyond the underlying geometrical division.
The observed east–west width of the tectonic rings at the equator therefore appears to be closer to 20° than to 15°. A theoretical value of 21° would fit the convection-roll framework particularly well: a 15° lower-mantle convection unit, combined with two 1.5° upper-mantle roll widths on each side, gives
15° + 3° + 3° = 21°.
This provides a possible geometrical explanation for the greater width of the tectonically active zone relative to the underlying 15° division.
The African Rift System Within the Ring Geometry
When the geometry is compared with a tectonic map of Africa and the surrounding oceans, several major relationships become apparent.
The Red Sea lies along the outer boundary of the proposed Atlantic tectonic ring. The Mediterranean region, including its major subduction systems, occupies a position comparable to an active segment of the Ring of Fire.
The East African Rift System also falls within the proposed large-scale tectonic geometry. Particularly striking is the southern continuation of the rift system through the Malawi Rift toward the Indian Ocean. This major tectonic division follows approximately the double boundary separating the proposed Atlantic and Indian Ocean Rings.
Thus, several of Africa’s most important active tectonic structures—the Mediterranean convergence zone, the Red Sea spreading system, the East African Rift and its continuation toward the Indian Ocean—can all be examined within the same geometrical framework derived initially from the Ring of Fire.
A Framework for Further Testing
This geometrical construction raises a large number of new questions, but they can be addressed individually.
The important point is that the geometry provides specific, testable predictions. The positions of spreading centres, subduction zones, rift systems, plate boundaries and major tectonic junctions can be compared independently with the predicted inner and outer ellipses and with the underlying mantle-convection divisions.
The next stage is therefore not to add further complexity to the model, but to test each correspondence separately and determine how accurately the simple geometrical construction agrees with the observed tectonic structure of the Earth.
The Scotia Arc tectonic system, situated between southern South America and the Antarctic Peninsula, developed during the progressive disruption of the former geological connection between South America and Antarctica. Over tens of millions of years, extension, seafloor spreading, transform motion, subduction and back-arc spreading produced the exceptionally complex tectonic structure that now occupies the Scotia Sea. The system includes the North and South Scotia ridges, the extinct West Scotia Ridge, the active East Scotia Ridge, the South Sandwich volcanic arc and trench, as well as a number of continental fragments and smaller tectonic blocks.
The progressive opening of the region also created the Drake Passage, establishing an oceanic connection between the Pacific and Atlantic sectors of the Southern Ocean. A shallow gateway may already have existed by about 50 million years ago, while a deep-water connection developed later, particularly as seafloor spreading became established in the West Scotia Sea between about 34 and 30 Ma. This opening eventually allowed circumpolar ocean circulation to develop around Antarctica. The Antarctic Circumpolar Current profoundly influences the transfer of heat between Antarctica and lower latitudes and contributed to the increasing thermal isolation of the continent.
What is particularly interesting in the present study, however, is the geometry of the entire tectonic system. Although the Scotia Arc is conventionally described as an arcuate tectonic structure, its principal ridges, plate boundaries and subduction systems can, in the geometrical interpretation developed here, be contained within an approximately elliptical large-scale form. The minor-axis meridian of this ellipse lies at approximately 49.7°W.
This position is especially notable when compared with the elliptical form previously identified around the Icelandic shelf, whose corresponding minor-axis meridian lies at approximately 19.7°W.
The difference is almost exactly: 49.7°W − 19.7°W = 30.0°
Thus, the central axes of two geographically remote and tectonically very different regions fall on meridians separated by exactly 30° of longitude within the proposed mantle convection-roll framework.
This comparison does not imply that Iceland and the Scotia Arc formed through the same tectonic processes. Iceland lies on an active divergent plate boundary associated with the Mid-Atlantic Ridge, whereas the Scotia Arc contains a much more complicated combination of transform boundaries, extinct and active spreading centres, back-arc extension and subduction. What is being compared here is therefore not the detailed tectonic mechanism, but the large-scale geometry and its position within the proposed global convection-roll system.
This distinction makes the correspondence more interesting rather than less: two very different tectonic systems appear to be organised within similarly defined large-scale geometrical frameworks.
Iceland and the Antarctic Peninsula
There is another useful reason for making this comparison. Iceland lies between approximately 63° and 67°N, while the northern Antarctic Peninsula occupies broadly corresponding latitudes in the Southern Hemisphere. We therefore have exposed land at approximately equivalent absolute latitudes on opposite sides of the Earth, allowing some geometrical relationships to be compared directly.
An earlier comparison was presented here:
Iceland and Antarctic Peninsula compared
When the outline of the Antarctic Peninsula is transferred to the Iceland region according to corresponding positions within the proposed convection-roll framework, an intriguing relationship appears. The trend of the Antarctic Peninsula follows closely the principal division line of the North Atlantic tectonic system where that line crosses Iceland.
The same relationship can be shown on the geological map base of the Icelandic Institute of Natural History and the National Energy Authority:
And when the corresponding Antarctic line is added:
Iceland division line with Antarctica division line
The geometrical agreement is striking. It should not, however, be interpreted simply as a similarity in coastline shape. The proposed explanation is that both regions occupy corresponding positions relative to the same large-scale system of mantle convection rolls. If the underlying geometrical controls are comparable, some similarity in the orientation of tectonic structures at the surface would be expected.
The new comparison with the entire Scotia Arc adds an important dimension to this earlier observation. The minor axis of the proposed Icelandic ellipse follows approximately 19.7°W, whereas the corresponding axis through the Scotia Arc system follows approximately 49.7°W. The two are therefore separated by 30° of longitude, one of the fundamental longitudinal intervals identified in the convection-roll model.
The Antarctic Peninsula extends away from the Scotia system in a position that can consequently be compared with Iceland after applying this 30° longitudinal relationship. When the two regions are superimposed according to that geometry, the Antarctic Peninsula follows a trend comparable to the principal tectonic and volcanic division across Iceland.
There is also a suggestive mirror-like aspect to the comparison. From its connection with the Scotia Arc, the Antarctic Peninsula extends predominantly southward, while the principal volcanic zones of Iceland extend through the Icelandic shelf in a broadly corresponding geometrical arrangement. The comparison is not exact at the level of individual faults or volcanic centres, nor should it be expected to be. The significant feature is the correspondence of the large-scale axes, orientations and longitudinal positions.
This gives the Scotia Arc–Iceland comparison particular importance within the model. It is not an isolated match between two selected geological features. Rather, the 30° separation between the two central meridians occurs in addition to numerous other cases in which major geological structures appear to coincide with the regular longitudinal framework predicted by the mantle convection-roll system.
The Scotia Arc therefore provides an unusually useful test area. Its tectonic history is independently well established, its internal structure is exceptionally complex, and yet the system as a whole can be examined geometrically. If such a complex assemblage of spreading ridges, transform boundaries, subduction zones and volcanic arcs is nevertheless organised within the predicted large-scale framework, the correspondence deserves closer investigation.
The geological features found at these corresponding latitudes in the Southern and Northern Hemispheres appear, to some extent, to mirror one another.
The broadly elliptical Scotia Arc tectonic system can be compared with the elliptical outline of the Icelandic shelf, while the volcanically active Antarctic Peninsula may likewise be compared with the volcanic regions of Iceland.
The two areas are by no means identical. Their geological settings are fundamentally different, not least because the Antarctic Peninsula is strongly influenced by the presence and tectonic history of the Antarctic continent, whereas Iceland is surrounded by oceanic crust and lies astride an active mid-ocean ridge system.
Nevertheless, the comparison is presented here because the large-scale mirroring effect is difficult to overlook. Despite the very different geological environments, the overall geometry, orientation and position of the principal tectonic and volcanic features show a striking degree of correspondence.
The analysis of the Ring of Fire has raised the possibility that its overall form is considerably more regular than is generally apparent, and that its geometry may be controlled by large-scale mantle circulation together with the configuration of adjacent parts of the Earth. This naturally directs attention toward Antarctica, which is itself arranged in a remarkably systematic way around the South Pole.
Most important lower mantle divisons marked with thick red lines.
The division of Antarctica into East and West Antarctica is well established, and the geological boundary between the two passes relatively close to the geographic South Pole. When the entire Antarctic Plate is considered, rather than only the continental landmass, its overall form is elongated and can be approximated by an ellipse. Significantly, the minor axis of this ellipse follows the principal division between East and West Antarctica.
The World’s Oceans in Relation to the Elliptical Geometry of the Antarctic Plate.
The endpoints of the major axis correspond approximately to the major oceanic-ridge junctions on opposite sides of Antarctica: toward the Indian Ocean ridge system on one side and the East Pacific Rise system on the other.
The Mantle Convection Roll Model also corresponds closely with the orientations of the major and minor axes in the western and eastern Pacific sectors surrounding Antarctica. The relevant boundaries intersect these axes near 64°S. A considerable degree of geometrical agreement therefore emerges between the Ring of Fire, the proposed mantle-convection-roll system, and the principal axes of the Antarctic Plate in the southern Pacific region. This relationship is illustrated on the accompanying map.
Extending the Geometry Beyond the Pacific
To examine whether this correspondence represents a broader global pattern, the Atlantic and Indian Ocean regions must also be considered. The inner boundary of the Ring of Fire spans here theoretically 120° from east to west where it crosses the equatorial region. This suggests a simple research hypothesis: if the Pacific system occupies approximately one third of the Earth’s circumference, comparable tectonic rings might occupy the other two 120° sectors.
The first test of this idea can deliberately be kept as simple as possible. A mathematical ellipse is constructed to span 120° at the equator, with its centre positioned 6° south of the equator and with a major-to-minor axis ratio of 1.5. A second, outer ellipse is then constructed around it, spanning 150°, while retaining the same centre. The 150° span corresponds to measureable distance between concrete points along the equator. This provides a straightforward geometry that can be compared directly with mapped tectonic structures. In the Atlantic case, the centre of the proposed elliptical system is placed at approximately 6°S, 29.5°W. The important point is that these parameters are established before detailed geological adjustment. The question is therefore not whether an ellipse can be fitted retrospectively to selected tectonic features, but how well a deliberately simple geometrical construction corresponds to the actual tectonic pattern.
Correspondence with Major Tectonic Structures
When this geometry is plotted on a global map, the agreement with several major tectonic structures appears unexpectedly strong. One of the clearest examples is the Kermadec–Tonga system, which fits naturally into the proposed Indian Ocean Ring. This is particularly significant because Kermadec–Tonga is conventionally regarded as part of the wider Pacific Ring of Fire. In the present model, however, it lies within the sector where the Pacific and Indian Ocean tectonic systems overlap.
A similar relationship appears between the Pacific and Atlantic systems. The Caribbean region and Indonesia occupy broadly corresponding positions at the intersections between the major rings: the Caribbean at the junction between the Pacific and Atlantic systems, and Indonesia at the junction between the Pacific and Indian Ocean systems. Both therefore occupy geometrically comparable positions relative to the proposed mantle-convection-roll framework and to major divisions in the lower mantle. This correspondence is important because the two regions are among the most tectonically complex areas on Earth. Rather than lying randomly within the global pattern, each appears close to a junction between two of the proposed large-scale tectonic systems.
A further complex relationship occurs between South America and Antarctica. The Scotia–Drake Passage–South Sandwich region contains a particularly complicated combination of spreading, transform motion and subduction, yet this system also appears to display symmetry relative to intersection points derived from the mantle-convection-roll geometry.
Overlapping Tectonic Rings
The derivation of these tectonic rings is in several respects more difficult than the derivation of the mantle-convection-roll system itself. The latter concerns an idealized organization within the mantle, whereas the tectonic rings are expressed through lithospheric plates that have evolved, fragmented, rotated and interacted over geological time. The regions where the proposed rings overlap therefore constitute a separate field of investigation.
Nevertheless, it is significant that such a simple initial construction produces such extensive correspondence with mapped tectonic structures. The geometry was not derived independently for each region. Instead, the same basic parameters are repeated around the Earth and then compared with the geology. Considerable work is still required before the system can be defined precisely. Among the factors that must be examined are the geometry of the Earth’s geoid, the use of latitude and longitude on a curved rather than planar surface, and the apparent southward displacement of the tectonic-ring system, which in the present construction places the centres approximately 6° south of the equator.
The distinction between mathematical geometry on a map projection and geometry on the actual surface of the Earth is particularly important. Future calculations should therefore define the ellipses geodetically rather than treating longitude and latitude simply as Cartesian coordinates.
The Red Sea as a Particularly Strong Correspondence
Apart from Kermadec–Tonga, the Red Sea appears to provide one of the clearest correspondences with the tectonic geometry derived from the Ring of Fire. The outer boundary of the proposed Atlantic Ring runs approximately along the central axis of the Red Sea. This is especially interesting because the Red Sea is not merely a geographical depression but an active divergent plate boundary containing an axial spreading system and developing oceanic crust. Its position therefore provides a potentially important test of the model.
The Red Sea relationship also appears to repeat a geometrical pattern observed on the opposite side of the system, along western North America. From the San Andreas region southward through Mexico and the Gulf of California, active plate-boundary structures and spreading centres follow a broadly comparable orientation along the outer margins of the large-scale tectonic ellipses. The corresponding boundary lines are separated by approximately 105°, consisting of 90° between the parallel outer edges of the two elliptical systems plus the intervening 15°-wide tectonically active zone.
The comparison is not intended to imply that these regions have identical tectonic histories. Rather, they appear to occupy corresponding positions and orientations within the larger geometrical framework.
Repeated Ridge Orientations at 90° Intervals
This relationship recalls an earlier observation concerning the Reykjanes Ridge and the Juan de Fuca Ridge. These ridge systems occur approximately 90° apart within the proposed global geometry, yet follow corresponding structural directions. Such repetitions become increasingly important when several independent tectonic features are considered together. A single alignment can readily be coincidental. A repeated combination of alignments, orientations, intersection points and distances is more informative and can be tested quantitatively.
The mantle-convection-roll system also provides a direct geometrical continuation from the minor axis of Antarctica toward the Reykjanes Ridge and Iceland. Thus, Iceland does not appear in this framework merely because it lies on the Mid-Atlantic Ridge. Its position can also be related to one of the principal Antarctic axes and to the wider system of global tectonic divisions.
Multiple Independent Relationships
The resulting pattern is therefore not based on one isolated correspondence. Several different relationships appear simultaneously: The axes of the Antarctic Plate, the geometry of the Ring of Fire, the proposed Atlantic and Indian Ocean Rings, major spreading ridges, major subduction systems, complex plate-boundary junctions, and the mantle-convection-roll divisions all show repeated geometrical relationships.
Previous analysis has also shown that the world’s principal geyser regions can be placed within the same geometrical framework. Iceland, Yellowstone, Kamchatka, New Zealand, Chile and East Africa each occupy positions that can be related to major axes, ring boundaries, intersections or tectonic divisions within the proposed system. This does not by itself establish a common physical cause. It does, however, considerably increase the number of independent geological observations against which the geometry can be tested.
A Working Global Hypothesis
The purpose of the present construction is therefore not to claim that the three tectonic rings have already been demonstrated as physical mantle structures. At this stage they are best regarded as a geometrical research hypothesis derived from the observed form of the Ring of Fire.
The procedure is intentionally simple: First, identify the regularities already present in the Ring of Fire; then construct equivalent geometrical forms at 120° intervals around the Earth; and finally compare those forms with independently mapped tectonic structures.
The surprising result is that the comparison does not produce random relationships. Instead, major structures repeatedly appear close to predicted axes, boundaries, overlaps and intersection zones. If further quantitative analysis confirms these relationships, the three-ring geometry may provide an additional way of examining how the lithosphere is organized above large-scale mantle circulation. The central question is therefore no longer simply why the Pacific Ring of Fire has its familiar form. A broader question arises:
Is the Ring of Fire one visible part of a larger, globally organized tectonic system extending through the Pacific, Atlantic and Indian Ocean regions and geometrically linked to Antarctica and the underlying mantle circulation?
When the three large-scale tectonic rings considered here—the Pacific Ring of Fire, the Atlantic Ring and the Indian Ocean Ring—are viewed together, their geometry becomes increasingly apparent through comparison with the principal geological structures associated with them. Although the Pacific Ring of Fire is by far the most readily recognizable of the three, the Atlantic Ring appears to occupy a more geometrically central and symmetrical position within the system.
The Ring of Fire (red), the Atlantic Ocean Ring (orange), and the Indian Ocean Ring (yellow).
In the Atlantic case, the inner and outer ellipses are arranged symmetrically. At the equator, the distance between them corresponds to ten of the proposed mantle-convection divisions, each spanning 1.5° of longitude. When the geometry is calculated from latitude and longitude, this spacing retains the same mathematical width around the elliptical system rather than representing a simple constant distance measured east–west.
A comparable relationship occurs along the eastern part of the Pacific Ring and the western part of the Indian Ocean Ring. However, where the Pacific and Indian Ocean systems overlap, the distance between the corresponding inner and outer elliptical boundaries becomes approximately twice as large.
Overlap Between the Pacific and Indian Ocean Rings
This difference may be significant. Much of the overlapping Pacific–Indian sector is characterized by subduction and convergent tectonics, whereas the Atlantic system is dominated by divergence associated with the Mid-Atlantic Ridge. The geometry may therefore reflect a fundamental distinction between regions dominated by upwelling and spreading and those dominated by downwelling and subduction.
Within this arrangement, the Philippine Sea Plate lies essentially within the Pacific Ring, whereas the Kermadec–Tonga system falls within the Indian Ocean Ring. This is important because features that at first appear to belong exclusively to the conventional Pacific Ring of Fire may, in this geometrical interpretation, occupy the overlapping margins of two separate large-scale tectonic systems.
Connections with the Antarctic Axes
Although three tectonic rings are identified, while four principal elliptical-axis directions can be extended outward from Antarctica, a considerable degree of correspondence emerges between the two geometries. One simple example is provided by three of the world’s best-known geyser regions: the Valley of Geysers in Kamchatka, Yellowstone, and the Geysir geothermal area in Iceland. Their positions are separated by approximately 90° within this global framework.
The Atlantic ellipses are centred geometrically on an extension of the minor axis of the Antarctic system. Iceland lies directly on this axis, at the point where the outer Atlantic ellipse crosses it. The same outer Atlantic ellipse also reaches the Yellowstone region and follows the general position of the Red Sea farther south. Thus, structures that are normally considered separately—the North Atlantic spreading system, Iceland, the Red Sea and the Yellowstone region—appear within the same large-scale elliptical geometry.
Other Geometrical Correspondences
Other striking relationships also emerge. New Zealand and Italy, for example, occur near opposite ends of the outer ellipse assigned here to the Indian Ocean Ring. Both are tectonically and volcanically active, and their overall geographical outlines are remarkably similar when considered in opposite orientation. This comparison has been discussed separately, but within the present framework their positions become part of a broader geometrical relationship rather than an isolated coincidence.
Hemispheric Asymmetry and the 45° Orientation
Explaining the physical origin of such a pattern is considerably more difficult than identifying the geometry itself. The elliptical forms are broadly symmetrical with respect to the equatorial region, but they are not perfectly symmetrical between the Northern and Southern Hemispheres. Their geometry is also related to the South Pole. In the mathematical construction used here, the outer ellipse ultimately extends to 90°S, while reaching only approximately 75°N.
Another important characteristic is the orientation of the ellipses. Their principal axes are inclined by approximately 45° relative to the geographic north–south direction: the major axis trends broadly northwest–southeast, while the minor axis trends northeast–southwest.
Possible Influence of Earth’s Rotation
This orientation raises a possible dynamical question. The rotation of the Earth produces opposite lateral deflections of moving material in the Northern and Southern Hemispheres. Consequently, a process that contributes to a westward displacement of a moving component in the Northern Hemisphere would have its corresponding deflection toward the east in the Southern Hemisphere. If the observed geometrical forms reflect the behaviour of moving material within the mantle, their orientation may therefore result from an interaction between rotational effects and organized mantle circulation.
Within such an interpretation, two components would have to be considered together: the geometry imposed by mantle-convection structures and the opposite rotational influence acting in the two hemispheres. A long-term equilibrium between these components could potentially produce preferred directions lying approximately halfway between the north–south and east–west axes, resulting in the observed orientation of about 45°. At this stage, however, the 45° orientation should primarily be regarded as an observed geometrical characteristic of the proposed system; its dynamical explanation requires separate physical analysis.
The San Andreas Fault as a Key Example
The San Andreas Fault provides one of the most interesting possible indications of such horizontal tectonic organization. Along its central part, the relative motion of the Pacific Plate is largely parallel to the fault system. In the geometry presented here, this motion also follows the inner minor-axis direction of the Pacific Ring. The correspondence between plate motion, the fault orientation and the minor axis of the ellipse therefore provides a particularly useful location for examining whether the geometry represents more than a purely cartographic relationship.
The relationship between the minor axis of the Pacific Ring and the corresponding Antarctic axis provides another possible indication of large-scale tectonic organization. Similarly, the central position of the Atlantic ellipse relative to the opposite extension of the Antarctic minor axis suggests that the Antarctic geometry and the three surrounding tectonic-ring systems may belong to a common global pattern.
The Mid-Atlantic Ridge Within the Elliptical Geometry
The Mid-Atlantic Ridge naturally forms an important part of this comparison. Its broad north–south course follows the Atlantic domain, but in the North Atlantic the ridge departs markedly from a simple meridional line. The westward curvature associated with the Iceland–Greenland–North Atlantic region corresponds closely to the westward extension of the proposed Atlantic ellipse. Rather than treating this curvature simply as a local irregularity in the ridge system, it can therefore be examined as part of the larger geometry.
Significance of the Combined Three-Ring Model
The main addition resulting from the present analysis is therefore not the identification of any single tectonic feature, but the comparison of the three proposed rings with one another. Their mutual intersections, changes in width, relationships with spreading and subduction zones, and alignment with the principal axes extending from Antarctica provide additional constraints that are not apparent when the Pacific, Atlantic and Indian Ocean systems are examined independently.
Most importantly, the geometrical relationships can be described and tested independently of any proposed mechanism. The existence, accuracy and statistical significance of the alignments should therefore be evaluated first. Only after the geometrical pattern has been established quantitatively should possible explanations involving mantle convection, plate motion and rotational effects be assessed.
