Woodhouse 11 for Mw > 6. The red series in Fig. Similarly, earthquake recurrence is more difficult to examine for other long oceanic transform faults, such as those in the equatorial Atlantic, that have considerably smaller long-term slip rates. The fault segment between -665 and -680 km (green symbols in Fig. The solutions, additional methodology and other pertinent data are described more fully in Appendix A and the Supporting Information. G. P. Wolfe et al. Forsyth The point-source depths are about 10-12 km, which suggests that the earthquakes ruptured faults that cross the M discontinuity. Our locations and those of the ISC based on body waves are located systematically about 25 km south of the transforms as mapped in Fig. In those circumstances the use of longer period Rayleigh and Love waves, as in the CMT methodology, can lead to those events being identified confidently as earthquakes. Okal Menard A break in the smooth trend of the ridge at latitude 37.5S has been recognized in both bathymetric and altimetric data. Posts about Eltanin Fracture Zone System written by yamkin. E.A. [8], Coordinates: .mw-parser-output .geo-default,.mw-parser-output .geo-dms,.mw-parser-output .geo-dec{display:inline}.mw-parser-output .geo-nondefault,.mw-parser-output .geo-multi-punct{display:none}.mw-parser-output .longitude,.mw-parser-output .latitude{white-space:nowrap}000N 1800W / 0.000N 18.000W / 0.000; -18.000, "Dolomite formation in pelagic limestone and diatomite, Romanche Fracture Zone, Equatorial Atlantic", 10.1175/1520-0485(1998)028<1929:MITRFZ>2.0.CO;2, "Lower Cretaceous to Eocene sedimentary transverse ridge at the Romanche Fracture Zone and the opening of the equatorial Atlantic", "Hydrothermal activity on the southern Mid-Atlantic Ridge: Tectonically- and volcanically-controlled venting at 45S", "Transport of Bottom Water in the Romanche Fracture Zone and the Chain Fracture Zone", 10.1175/1520-0485(1998)028<0779:TOBWIT>2.0.CO;2, "Biodiversity and biogeography of hydrothermal vent species: thirty years of discovery and investigations", https://en.wikipedia.org/w/index.php?title=Romanche_Trench&oldid=1090955796, This page was last edited on 1 June 2022, at 10:32. [2], The trench has a depth of 7,761m (25,463ft), is 300km (190mi) long and has an average width of 19km (12mi) and allows for a major circulation of deep ocean basin water from the west Atlantic to the east Atlantic basins. Examine the figure above. Sea-surface shape by satellite Pelagic shrimps of the Family Oplophoridae (Crustacea Decapoda) from the Pacific sector of the Southern Ocean: USNS Eltanin Cruises 10, 11, 14-16, 19-21, 24 . (1975) obtained strike-slip mechanisms for them and another event in 1967. Hence, with its inclusion, the series appears to be complete from at least 1981 to 2010. Marathon Expedition, Leg 6 Studies in the Tonga Trench, Louisville Ridge, and Eltanin Fracture Zone What is the reflection of the story of princess urduja? Nearby ocean bottom seismometers are needed to detect them. When Sykes showed his results to M. Ewing, the latter arranged with NSF (US National Science Foundation) for the Research Vessel Eltanin to map the region. Nakata Since CMT locations are not available before 1976, the 10 largest earthquakes from 1969 to 1975 are shown in green at their body-wave locations of the International Seismological Centre (ISC). We determined a few CMT mechanisms for which PDE or ISC did not compute hypocentres, for which we relied on detections and locations based on intermediate-period surface waves (Ekstram 2006). [7] If those segments are not fully coupled, our calculations of downdip width, of course, are minimum estimates. [4] Where is and what is Eltanin Transform Fault and Fracture Zone. Our knowledge of the Eltanin system is limited by the relatively high magnitude of completeness of events, Mw 5.4, and the paucity of aftershocks and forerunning events. Sykes & Menke (2006) calculated maximum-likelihood estimates of COV that were 0.3 or smaller for a number of large-to-great earthquakes that ruptured nearly the same segments of strike-slip and subduction zone faults. Mw determined in this study compared with the surface wave magnitude Ms as computed by either ISC or PDE for periods between about 17 and 22 s. Mw is determined at longer periods. Map view of CMT locations of earthquakes along Hollister transform fault from 1976 to 2010. right. m3/(kgs2). If the 1981 shock were mislocated at least 12 km eastwards, the length of the repeating segment would be about 30 km. The along strike dimensions and perhaps the downdip widths of asperities must be small for parts of the three Eltanin faults that have not ruptured in events larger than Mw 5.0-5.5. The segment of the Heezen transform between 29 and 71 km (Fig. Whether the depths obtained for normal-faulting events, which occurred off the transforms, applies to strike-slip events along the transforms themselves is equivocal since the velocity and thermal structure of the three transforms is not known and close-in observations with ocean bottom instruments have not been made. "zone" in Chinese : n. 1. () 2. 3. . . Use the facts stated above when they apply. Also, there was no discontinuous change in the calculated Mo when the CMT was evaluated above the Moho (which in PREM is at 24.4 km) or below it. 4 are more tightly clustered in map view. Shen D.W. This is in accord with the findings of Stewart & Okal (1983) that the Eltanin system has not broken in great events since 1920 and is unlikely to do so. (1981), Arvidsson & Ekstrm (1998) and Ekstrm et al. The steep slope of about -2.9 for Mw > 6 is unusual. Their average repeat time is 7.1 yr and their COV is 0.28. n=02+(1)nn2+7\sum_{n=0}^{\infty} \frac{2+(-1)^{n}}{n^{2}+7}n=0n2+72+(1)n, Which is an example of homeostasis? (1988) found that at magnetic chron 34, 83-121 Ma, when New Zealand broke away from Antarctica, there was essentially no fault offset at the location where the Eltanin system was later to develop. Ms, which is typically reported by PDE and ISC only for Rayleigh waves and for periods between about 18 and 22 s, may yield a biased estimate of the long-period character of a seismic source as a result of low excitation at certain focal depths and biased sampling of the radiation field. In this method, the moment tensor and source centroid are estimated by matching observed long-period three-component seismograms to synthetic waveforms calculated using normal-mode summation. Hence, we cannot distinguish between those two models. Ekstram -Linear spreading on Earth's curved surface. Small amounts of normal faulting occurring off transform is in accord with the idea that the Euler pole has moved relatively recently in time to place each of the three transform zones under a small component of extension. C. The efforts that we made, which are described in Appendix A, resulted in a number of additional solutions, especially for the period 1976-1991 and for Mw 5.4-6.0 (see Fig. The three sets of large events have a repeat time of 13 yr and a COV of 0.13. 4. Mw determined in this study compared with short-period body-wave magnitude mb as computed by either ISC or PDE. The ridge segments and transform faults of the East Pacific Rise and Pacific-Antarctic ridge are the sites of the fastest rates of the seafloor spreading and relative plate motion in the world. of fracture zones in the southern oceans by mavis lynn driscoll b.a., university of california at berkeley, 1981 submitted in partial fulfillment of the requirements for the degree of doctor of philosophy at the massachusetts institute of technology and the woods hole oceanographic institution june 1987 -Different segments of the mid-ocean ridge system spreading at different rates. 7, however, since it is located just to the east of other large shocks along the Heezen transform. (1993) and Abercrombie & Ekstrm (2001) clearly include the uppermost oceanic mantle for earthquakes along three slower moving transform faults in the Equatorial Atlantic. 7 is not unreasonable for single events of Mw 5.9-6.1. Thermal models with constant and variable mineral physics properties are formally analyzed for fits against recently filtered databases for heat flow and topography. D.F. Excluding it does not change the average repeat time for events of Mw > 5.9; it increases the SD and COV slightly. We show events characterized by a predominance of strike-slip faulting that we located since 1976 in red along with the few earthquakes in blue that involved a predominance of normal faulting. Wolfe (2002) used nearby hydroacoustic stations to locate very small events and aftershocks along a number of oceanic transform faults. The horizontal axis is parallel to computed transform directions; the vertical is perpendicular to it. Wilson Ekstram However, a major offset developed on this transform between 60 and 80 Ma, prior to the oldest dated rocks from the ridge. If so, their repeat time was about 16 yr but is based on only three events. Some other fault segments with larger events rupture with less certain repeat times of 7-24 yr. Other segments are poorly coupled for shocks of Mw > 5.4 and perhaps smaller. This section appears to be separated from the western basin of the Atlantic by a sill of 4500 m (2400 fm) near 17W. The segment near the eastern end of the Heezen transform between 179 and 200 km (Fig. Atwater E.A. The total length of the three en echelon faults is nearly 1000 km; each is characterized by fast long-term rates of displacement of about 80 mm yr-1. Challenger Fracture Zone. Clearly, a gradient in the maximum size of earthquakes and seismic coupling occurs between the eastern and western ends of the Heezen transform. 4065 km S of Avarua, Cook Islands / pop: 13,373 / local time: 16:34:59.2 2016-05-02 4. Undersea Features Fishing & Outdoor Fracture Zone Maps: Undersea Features is home to a total of 187 Fracture Zone(s), listed below. LOUISVILLE RIDGE AND ELTANIN FRACTURE ZONE 3053 west to isolated peaks superimposed on ridge segments in the southeast. The transform valley is 15-20 km wide and 2-4 km deep. Moment release in earthquakes of Mw= 6.08 is about 60 per cent of that for Mw > 5.55. What causes the formation of offsets in the mid-ocean ridge system? 2. The new CMT catalogue that we obtained is more complete than older versions. (1993) find that a 10 clockwise rotation of magnetic anomalies north of the Heezen transform occurred within the last 4 Ma, which would put it in extension. McGuire What is the labour of cable stayed bridges? 1). The slope of -1.0 for the latter period for Mw 5.4-6.0 is typical of that for earthquakes in many areas of the world. The precision of epicentral locations in his study was improved considerably by using data from new seismic stations in Antarctica that were installed during the International Geophysical Year, 1957-1958, and computer programs for analysing P and PKP arrival times. We thank S. Carbotte and C. Scholz of Lamont and journal reviewers J. McGuire and C. Laederach for critically examining the manuscript and for valuable suggestions and P.G. The CMT methodology and format of the catalogue are described in Dziewonski (1981) and Ekstram (2005). Y. CHALLENGER FRACTURE ZONE. Sykes It is the only example of a very short time interval between large shocks along segments of the Eltanin transforms. . Figs 4-6 depict the three Eltanin transforms in greater detail. We show in detail, however, that some segments of the three transforms are aseismic at the Mw > 5.4 level whereas others are more strongly coupled. J.J. This tectonics article is a stub. (2007) and others modelled temperatures in the vicinity of oceanic transform faults at fast moving plate boundaries that differ from those for the earlier simple plate cooling models. Dotted lines denote approximate locations of ridge segments. Our calculations of moment magnitude Mw are compared with determinations of the short-period magnitude mb in Fig. C.G. Stewart & Okal (1983) concluded that earthquakes along the Eltanin zone from 1920 to 1981 accounted for less than 10 per cent of the slip predicted by kinematic models of plate motion and cooling. (1993) found another normal faulting event just to the south of the Menard transform fault at 49.5 S along the same plate boundary. 8, interaction between the two may well occur. We take this along with the distributions of events in time and longitude after 1976 (Fig. 6). Bohnenstiehl et al. Similarly, the series between 95 and 121 km (blue in Fig. This experiment addresses one component of the potential bias that may be present in CMT seismic moments. Fracture Zone. Since the 40-km section of the Tharp (Fig. In discriminating the signals of earthquakes from those of underground nuclear explosions low excitation of Rayleigh waves in the narrow period band used for determining Ms may result in a few earthquakes appearing to be explosions. Ekstram Smith Strike-slip mechanism in centre is that for 2007 event. Montesi Others related faults include the Vacquier Transform Fault, the Menard Transform Fault, and the Udintsev Fault.[3]. G. florida a jurassic transform plate boundary. F. Those estimates are smaller than those for oceanic transforms at much slower moving plate boundaries, which is in accord with the notion, which we accept, that temperatures are higher at a given depth for fast moving plate boundaries. . For example, if it is known that an earthquake occurred at a depth of 10 km, and the CMT was calculated at 25 km, is there a corresponding bias in the CMT estimate of Mo? His values and ours of COV = 0.26 imply quasi-periodic behaviour. trench to the Eltanin Fracture Zone. T. The inversion procedure follows the method of Ekstrm (1989) and leads to estimates of the earthquake focal mechanism, source-time function and point-source depth that are consistent with both the P-wave data and the CMT results. The smaller events in Fig. A large iceberg interfered with one scientific mapping (Lonsdale 1994). It is that region where three of the four normal faulting earthquakes in Fig. J. Equidistant polar diagram out to distance of 135 centred on our study area, the Eltanin transform system, illustrating distribution of stations that contributed data to CMT solutions. Two 20-km segments of the Hollister transform (Figs 3 and 6) are the sites of several earthquakes of Mw= 5.9 whereas only single shocks of that size are found along its western half. We report the unique occurren M.S. As AABW flows through the Romanche Fracture Zone, salinity and temperature increase significantly. which two plates create the eltanin fracture zone quizlet; Well Inspection using ROV at Kondashetti Halli, Bangalore Our new catalogue can be used in testing computer simulations of earthquake recurrence. 3391km (2107mi) WSW of Ushuaia, Argentina The two largest (Mw 6.7 and 5.9) occurred well to the north of the transform in 2001 and 2007. It seems unlikely that our CMT location errors would change much over the length of the Tharp transform. They also report reverse faulting events near transform faults at other plate boundaries, another indication of changes in relative plate motion during the last few million years. This completeness can be seen as well by the slope of 1.0 of the LogNMw relationship in Fig. Watts Aseismic parts of the Heezen and Tharp fracture zones can be traced far to the northwest and southeast. . We conclude that strike-slip and normal faulting along the three Eltanin transforms are partitioned so that strike-slip faulting takes place along the transforms themselves and normal faulting occurs nearby but just off the transforms. L.M. . a) reproduction b) controlling an experiment c) growth and development d) maintaining a steady temperature, An equation for the period T of a planet (the time to make one orbit about the Sun) is, T2=42r3/(GM)T ^ { 2 } = 4 \pi ^ { 2 } r ^ { 3 } / ( G M ) 4). They find that aftershock zones of nearby pairs of moderate-size earthquakes along fast-moving transforms were separated by small spreading centres. Arvidsson Seamount chains in the Pacific basin tend to be aligned northwesterly, and several chains are intimately associated with fracture zones; the Eltanin Fracture Zone in the southwestern Pacific is an example. Wolfe et al. Phipps Morgan & Forsyth (1988), Shen & Forsyth (1992), Behn (2007), Gregg et al. . The flow of NADW through the Romanche and Chain Fracture Zones may serve as a conduit for larval transport from the western North Atlantic to the eastern South Atlantic. The seismic history of the Eltanin Fracture Zone on the Pacific-Antarctic Ridge for the years 1920-1981 shows that the seismic slip accumulated during this recording interval accounts for only a small fraction (less than 10%) of the amount of slip predicted by kinematic models of plate motion. The combined three Eltanin transform faults are much more active at the Mw~ 6 level than a comparable length of either the San Andreas Fault in California or other transform systems on land. It and some other segments of the three Eltanin transforms appear to be well coupled seismically. Blue symbols indicate four normal faulting mechanisms and their T-(extensional) axes. L.R. Individual ridge segments trend, how- ever, up to a few tens of degrees from the smooth trend. A.M. Earth Extremities I cover many earth extremities ranging from Earthquakes, Quake Swarms, Volcanic Activity/Eruptions, CME's - Coronal Mass Ejections, Solar Flares, Geomagnetic Storms, Magnetosphere Pressure plus other solar related radiation pulses, Asteroid/Meteorite Threats, Solar . Available long-period data for events along the three transforms increased from about 15 to 100 global stations as illustrated in Fig. The morphology of the Atlantis Fracture Zone is typical of that of slow-slipping transforms. This yielded 84 earthquakes. T. The summit of the transverse ridge is capped by Miocene shallow water limestones that reached above sea level 20 Ma before subsiding abnormally fast. Unlike all the other countries in the St. Cecilia Archipelago, Eltanin is only comprised of one island. The greater number of stations in the last 20 years permitted CMT solutions to be obtained for a large number of smaller earthquakes, some as small as Mw 5.15. . [3], Series of faults that offset the Pacific-Antarctic Ridge. Okal & Langenhorst (2000) relocated a number of earthquakes along the three transforms using short-period body waves. What causes the formation of offsets in the mid-ocean ridge system? The transverse ridge separates the present trench from an 800km (500mi)-long aseismic valley where the Romanche transform was located until about 108 Ma. The Eltanin Fault System (Eltanin Fracture Zone) is a series of six or seven dextral transform faults that offset the Pacific-Antarctic Ridge, a spreading zone between the Pacific Plate and the Antarctic Plate.The affected zone of the Pacific-Antarctic Ridge is about 800 km long, between 56 S, 145 W and 54.5 S, 118.5 W, southwest of Easter Island, and about as far as one can get from . COV = 0 and 1.0 correspond to strict periodicity and random occurrence, respectively. 5 and the bathymetric expression of it in Fig. Ekstram [5], The hydrothermal vents of the MAR support many life forms. The Antarctic-Pacific Plate boundary, while characterized by somewhat slower rates than segments of the East Pacific Rise farther north, contains three nearby transform faults-the Heezen, Tharp and Hollister-that together are about 1000 km long and have been the sites of numerous earthquakes of moment magnitude, Mw, 5-6.4 during the past 50 years. . The fracture along blocks of crust (tectonic plates) is called a Log of cumulative number of earthquakes per 20 yr larger than a given Mw as a function of Mw. His events along what we identify as a well-coupled zone between 29 and 59 km in Fig. Fig. Data for the reanalysis were collected from all the main global digital networks that have operated since 1976. Indeed, jets are observed to pass along both the Udinstev and Eltanin Fracture Zones (Gille 1994; Hughes and Ash 2001). (2009). (1993) for two other normal faulting earthquakes off the Eltanin transforms. It is formed by a transform boundary. In relocating earthquakes along the East Pacific Rise and Pacific-Antarctic Ridge, Sykes (1963) found that the pattern of epicentres was offset about 1000 km near 55 S. Cumulative seismic moment release for shocks of Mw > 5.55 from 1969 to 2010 along three additional segments of Heezen transform fault as indicated in Fig. The fast rate of plate motion, maximum size of events and relatively short repeat times make these fault segments a good laboratory for research on quasi-periodic behaviour and earthquake prediction. Nevertheless, strike-slip earthquakes along the three transform faults are much more numerous and have together released more seismic moment than the normal-faulting events. Eltanin fracture zone Scope Notes: SE Pacific. We obtained a CMT solution for an additional earthquake of Mw 6.15 in 1979. Nettles DeMets 2). Langenhorst Solid line indicates Mw=mb. This is an improvement over past formulations where bathymetric offsets were imposed kinematica. Rupture of two or more nearby asperities in shocks as large as Mw 6.4 can occur but is rare as ascertained from the steep slope of the frequency-magnitude relationship in Fig. G. What did the Nazis begin using gas chambers instead of mobile killing units and shooting squads after a while? 4, between -25 km and 0 km). R.G. Forsyth Eltanin has a maritime climate in the transition region between the tundra and subarctic zones (Kppen classification) which is characterised by . As in Fig. Reported values for the ratios KlRb RblSr La/Yb and Sr87 86ISr for fresh material, generally'"hint at a Pacific Ocean Topography 70%. Hence, a variety of rupture behaviours, repeat times and maximum observed magnitudes is associated with the active parts of the three transforms. We did not use the ISC catalogue for events after 1999. Experience has shown that deviations of the CMT centroid depth from the true depth occur both randomly and systematically. At faster separating parts of the Pacific-Antarctic boundary, and on most of the rest of the EPR, fracture zone structure is mainly inherited from the variable arrangement of volcanic ridges and tectonic uplifts at the risecrest intersections, rather than from structures formed at the transform valley. Of the 84 earthquakes from 1976 to 1989, we rejected seven CMT solutions. Hence, it and the two larger events occurred along an off-transform feature. fracture zones and transform faults flashcards quizlet. M.S. D.V. C1. Bohnenstiehl C.J. C2 shows that Mw is similar to Ms at larger magnitudes but is 0.40.9 units larger at Mw 5.4. We assume that earthquakes along a given segment of a transform occur on single faults although the distribution of CMT solutions scatters about 15 km perpendicular to the transforms. In contrast, normal-faulting events of Mw 5-6.5 are common along slower spreading ridges such as those in the Atlantic. D.K. H.W. Note exaggerated scale in transform-perpendicular direction. GE was partially supported by NSF grant EAR-09-24694. The synthetic waveforms used in the CMT inversion are corrected for lateral heterogeneity using the whole-mantle model of Dziewonski & Woodward (1992) for the body waves and long-period mantle waves, and the phase-velocity maps of Ekstrm et al. Gordon Exploring Data Coaching Activity: Longshore C, SmartFigure: Geostrophic current and western. This attests to the very thin lithosphere at fast spreading ridges. Larson The smooth trend of the ridge is NNW-SSE with a trend break at about 37.8S. The ISC located an event along the segment of Ms= 5.5 on 1975 April 19. Earthquakes of Mw 6.2-6.4 occur along each transform but larger events are confined to the eastern half of the Heezen, two parts of the Tharp and segments of the Hollister. The morphology of the Atlantis Fracture Zone is typical of that of slow-slipping transforms. In this paper we concentrate on these phenomena using earthquakes that have been relocated and reanalysed using long-period digital data from global stations for a recent 35-yr period (Fig. They concluded from analyses of seismograms, however, that the transform earthquakes themselves did not have a significant component of slow seismic slip. The absence of known earthquakes on the three transforms beyond their bounding ridge crests and the spacing of magnetic anomalies, however, indicate that the Pacific and Antarctic plates are intact today beyond the active parts of those transforms and that the lengths of the transforms are not continuing to grow. P.M. The segment between -210 and -241 km consists of a large number of events of Mw > 5.55, one of Mw 6.08, three of 6.15 =Mw= 6.17 and one of Mw 6.3 (Stewart & Okal 1983) on 1973 September 18. https://session.masteringgeology.com/problemAsset/3004355/4/MGEO_3004355_PartD.jpg. Their length, relative simplicity, 80 mm yr-1, long-term slip rate and the lack of known shocks of Mw > 7 make them a good laboratory for studying quasi-periodic recurrence of earthquakes on a timescale of years to a few decades. 10) was the site of many earthquakes of Mw > 5.55, two of Mw 6.13 and two of Mw 6.0, the latter two on the same day in 2010. The repeat times of those largest events are longer but uncertain since they are based on few earthquakes. Search for other works by this author on: Earthquake slip on oceanic transform faults, Global CMT analysis of moderate earthquakes, Mw (1997) for the intermediate-period, fundamental-mode surface waves. It moves 5) are characterized by shocks of Mw= 5.9 but about half of its length is not. We used a 97-km length of the Hollister that includes all large shocks (Fig. L.R. Boettcher Tolstoy S. Carbotte kindly computed the bathymetric map in Fig. The Romanche Fracture Zone offsets the Mid-Atlantic ridge by 900 km (560 mi), making it the largest equatorial fracture zone in the Atlantic. A.B. Fig. 7 for events of Mw > 5.55 (blue) and Mw > 5.9 (red). Where is and what is Eltanin Transform Fault and Fracture Zone? Several of those well-coupled segments ruptured quasi-periodically in earthquakes of Mw~5.5-6 and with repeat times shorter than 10 yr. We choose the Eltanin transform faults as another good place to search for these phenomena. The Eltanin Transform Fault and Fracture Zone is a series of six or seven dextral transform faults along ~800 km of the Pacific-Antarctic Ridge that offset it ~1600 km. This partitioning of slip likely results from changes during the last few million years in the Euler pole for relative motion between the Antarctic and Pacific plates. They are typified by some of the roughest sea conditions and most severe weather on the Earth. At 14.5W the trough reaches a maximum depth of 2895 fm (5470 m). That view was strengthen when Menard reviewed the manuscript and provided an unpublished bathymetric map that included more data in the far southeast Pacific. McGuire (2008) examined 16 pairs of Mw= 5.5 earthquakes that occurred along approximately the same segments of transform faults on the East Pacific Rise to the south and north of the equator. The isobaths are drawn at 500 m intervals between 1900 and 3400 m, from the dataset of Smith and Sandwell (1995). Rolandone [] ( ) "eltanin fracture zone" in Chinese : "eltanin" in Chinese : "fracture zone" in Chinese : ; ; ; ; ; . . The point source depth of 10.4 km places the 2007 earthquake 6-7 km below the ocean floor. 4 occurred. Cumulative moment release is shown in Fig. The principal fracture zones are identified, as are segments of the PAR. Abercrombie Hirth Eltanin Fracture Zone System: IHO-IOC GEBCO Gazetteer of Undersea Feature Names : English: Eltanin Fracture Zone: US BGN Advisory Committee on Undersea Features (ACUF) PlaceType: Fracture Zone : Latitude: 54 8' 16.8" S (-54.137999) Longitude: 127 32' 7.3" W (-127.53537) Min.
