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The seismicity and deep structure of Island arcs

1966; American Geophysical Union; Volume: 71; Issue: 12 Linguagem: Inglês

10.1029/jz071i012p02981

2156-2202

Lynn R. Sykes,

Geological and Geochemical Analysis

Journal of Geophysical Research (1896-1977)Volume 71, Issue 12 p. 2981-3006 The seismicity and deep structure of Island arcs Lynn R. Sykes, Lynn R. SykesSearch for more papers by this author Lynn R. Sykes, Lynn R. SykesSearch for more papers by this author First published: 15 June 1966 https://doi.org/10.1029/JZ071i012p02981Citations: 262AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Abstract The hypocenters of approximately 1500 earthquakes in the Tonga-Fiji, Kermadec, Kuril-Kamchatka, and Caribbean regions were redetermined using a digital computer. Since these computations are more accurate than those used in most previous studies, the spatial distribution of the redetermined hypocenters can be used to resolve structural features with dimensions larger than about 20 km. In each of the regions investigated in this paper a zone of intense seismic activity was found beneath the inner (islandward) margin of the oceanic trench. Near its northern end the Tonga trench curves abruptly to the west; the belts of shallow and deep earthquakes and the chain of active volcanoes curve similarly. Thus the tectonic processes responsible for the earthquakes, the volcanoes, and the trench are intimately related for depths from 0 to 650 km. Theories that attempt to explain the curvature of the trench must account for a similar curvature in the belts of deep and shallow earthquakes. The distribution of earthquake hypocenters in the New Hebrides and Tonga-Fiji regions indicates that these arcs are part of a larger structural feature. Earthquake foci in the Tonga-Fiji region are confined to a zone about 50 to 100 km thick that dips under the arc. In at least some regions this focal surface can be regarded as a continuous zone of tectonic activity that extends from the surface to a depth of about 650 km. Within the accuracy of the computations the dip of this zone is independent of depth. Similar results were obtained for the Kermadec, Kuril-Kamchatka, and Lesser Antillean arcs. A discontinuity in seismicity between the Tonga and Kermadec arcs can be traced from the surface to a depth of about 650 km. Near the southern end of the Tonga arc the depth of maximum deep-focus activity decreases from about 625 km to about 475 km within a horizontal distance of about 500 km. It is unlikely that this pronounced peak in the deep-focus activity is associated either with a phase change or with a particular layer unless the physical or chemical properties of the mantle have large lateral variations. References , Academy of Sciences, U.S.S.R., Atlas Zemletriaseniǐ v SSSR, 338, Moscow, 1962. Acharya, H. K., Seismicity of the Galápagos Islands and vicinity, Bull. Seismol. Soc. Am., 55, 609– 617, 1965. Adams, R. D., Source characteristics of some deep New Zealand earthquakes, New Zealand J. Geol. Geophys., 6, 209– 220, 1963. Aki, K., Accuracy of origin time, epicentre and focal depth of local earthquakes determined routinely by the Japan Meteorological Agency, Bull. Earthquake Res. Inst., Tokyo Univ., 43, 23– 38, 1965. Anderson, D. L., M. N. Toksöz, Surface waves on a spherical earth, 1, Upper mantle structure from Love waves, J. Geophys. Res., 68, 3483– 3500, 1963. Andreyev, B. A., Geophysical and geologic features of the deep-focus earthquake zone in the northwestern Pacific, English Transl., Dokl., Earth Sci. Sect., 150, 12– 14, 1963. Angenheister, G., A study of Pacific earthquakes, New Zealand J. Sci. Technol., 4, 209– 231, 1921. Båth, M., S. J. Duda, Earthquake volume, fault plane area, seismic energy, strain, deformation and related quantities, Ann. Geofis., Rome, 17, 353– 368, 1964. Benioff, H., Seismic evidence for the fault origin of oceanic deeps, Bull. Geol. Soc. Am., 60, 1837– 1856, 1949. Benioff, H., Orogenesis and deep crustal structure—Additional evidence from seismology, Bull. Geol. Soc. Am., 65, 385– 400, 1954. Benioff, H., Seismic evidence for crustal structure and tectonic activity, Geol. Soc. Am., Spec. Paper, 62, 61– 75, 1955. Benioff, H., Movements on major transcurrent faults, Continental Drift S. K. Runcorn, 103– 133, Academic Press, London and New York, 1962. Birch, F., Elasticity and constitution of the earth's interior, J. Geophys. Res., 57, 227– 286, 1952. Blot, C., Origine profonde des séismes superficiels et des éruptions volcaniques, Trav. Sci., Assoc. Seismol. Phys. Interior Earth, IUGG, Ser. A, 23, 103– 121, 1964. Bolt, B. A., The revision of earthquake epicentres, focal depths and origin-times using a high-speed computer, Geophys. J., 3, 433– 440, 1960. Brodie, J. W., T. Hatherton, The morphology of the Kermadec and Hikurangi trenches, Deep-Sea Res., 5, 18– 28, 1958. Eiby, G. A., The New Zealand sub-crustal rift, New Zealand J. Geol. Geophys., 7, 109– 133, 1964. Evison, F. F., Earthquakes and faults, Bull. Seismol. Soc. Am., 53, 873– 891, 1963. Fairbridge, R. W., The Melanesian border plateau, a zone of crustal shearing in the S.W. Pacific, Trav. Sci., Assoc. Seismol. Phys. Interior Earth, IUGG, Ser. A, 22, 137– 149, 1961. Fairbridge, R. W., Basis for submarine nomenclature in the South-West Pacific Ocean, Deut. Hydrograph. Z., 15, 1– 15, 1962. Fairbridge, R. W., H. B. Stewart Jr., Alexa bank, a drowned atoll on the Melanesian border plateau, Deep-Sea Res., 7, 100– 116, 1960. Fedotov, S. A., V. N. Aver'yanova, A. M. Bagdasarova, I. P. Kuzin, R. Z. Tarakanov, Some results of a detailed study of the seismicity of the southern Kuril Islands, English Transl., Bull. Acad. Sci. USSR, Geophys. Ser., 5, 413– 420, 1961. Fedotov, S. A., A. M. Bagdasarova, I. P. Kuzin, R. Z. Tarakanov, Seismicity and deep structure of the southern part of the Kurile Island arc, English Transl., Dokl., Earth Sci. Sect., 153, 71– 73, 1963. Fedotov, S. A., I. P. Kuzin, The velocity profile of the upper mantle in the vicinity of the South Kuril Islands, English Transl., Bull. Acad. Sci. USSR, Geophys. Ser., 5, 415– 425, 1963. Fedotov, S. A., I. P. Kuzin, M. F. Bobkov, Detailed seismological investigations in Kamchatka in 1961–1962, English Transl., Bull. Acad. Sci. USSR, Geophys. Ser., 9, 822– 831, 1964. Fisher, R. L., H. H. Hess, Trenches, in The Sea, 3 M. N. Hill, 411– 436, Interscience, New York and London, 1963. Goryatchev, A. V., On the relationship between geotectonic and geophysical phenomena of the Kuril-Kamtchatka folding zone at the junction zone of the Asiatic continent with the Pacific Ocean, The Crust of the Pacific Basin, Geophys. Monogr. Ser., 6 G. A. Macdonald, H. Kuno, 41– 49, American Geophysical Union, Washington, D.C., 1962. Griggs, D., J. Handin, Observations on fracture and a hypothesis of earthquakes, Geol. Soc. Am. Mem., 79, 347– 364, 1960. Gutenberg, B., C. F. Richter, Depth and geographical distribution of deep-focus earthquakes, Bull. Geol. Soc. Am., 49, 249– 288, 1938. Gutenberg, B., C. F. Richter, Seismicity of the Earth 2nd ed., (1st ed., 1949), Princeton University Press, 1954. Harrington, H. J., Deep-focus earthquakes in South America and their possible relation to continental drift, Polar Wandering and Continental Drift A. C. Munyan, 55– 73, American Association of Petroleum Geologists, Tulsa, Oklahoma, 1963. Healy, J., The hot springs and geothermal resources of Fiji, New Zealand Dept. Sci. Ind. Res., Bull., 136, 77, 1960. Heezen, B. C., The Tonga-Kermadec and Hikurangi trenches, Abstracts of Papers, 6, 70, I.U.G.G., 12th General Assembly, Berkeley, California, 1963. Herrin, E., J. Taggart, Regional variations in Pn velocity and their effect on the location of epicenters, Bull. Seismol. Soc. Am., 52, 1037– 1046, 1962. Hess, H. H., Major structural features of the western North Pacific, an interpretation of H.O. 5485, bathymetric chart, Korea to New Guinea, Bull. Geol. Soc. Am., 59, 417– 445, 1948. Hess, H. H., J. C. Maxwell, Major structural features of the southwest Pacific: a preliminary interpretation of H.O. 5484, bathymetric chart, New Guinea to New Zealand, Proc. Pacific Sci. Congr., 7th New Zealand, 2, 14– 17, 1953. Hodgson, J. H., Nature of faulting in large earthquakes, Bull. Geol. Soc. Am., 63, 611– 644, 1957. Houtz, R. E., The 1953 Suva earthquake and tsunami, Bull. Seismol. Soc. Am., 52, 1– 12, 1962. Houtz, R. E., K. A. Phillips, Interim Report on the Economic Geology of Fiji, Geological Survey Department, Suva, Fiji, 1963. Hunkins, K., J. T. Kuo, Surface wave dispersion in the Tonga-Fiji region, Bull. Seismol. Soc. Am., 55, 135– 145, 1965. Ichikawa, M., On the mechanism of the earthquakes in and near Japan during the period from 1950 to 1957, Geophys. Mag., 30, 355– 403, 1961. , Institute of Oceanology, Bathymetric chart of the Pacific Ocean (Tikhiǐ Okean), 1:25,000,000,Academy of Sciences,U.S.S.R., Moscow,1963. Isacks, B., L. R. Sykes, J. Oliver, Distribution in time of small deep and shallow earthquakes in the Fiji-Tonga region, 1966. Katsumata, M., Vertical distribution of earthquake foci in and around Japan, Geophys. Mag., 127, 483– 486, 1956. Kondorskaya, N. V., N. S. Landyreva, Seismicity of the Kamchatka region from permanent seismic station data, English Transl., Bull. Acad. Sci. USSR, Geophys. Ser., 10, 823– 830, 1962. Kondorskaya, N. V., G. A. Postolenko, Seismic activity of the Kuril-Kamchatka region for the years 1954 to 1958, English Transl., Bull. Acad. Sci. USSR, Geophys. Ser., 9, 646– 649, 1958. Kondorskaya, N. V., G. A. Postolenko, Analysis of observations on earthquakes in the Kuril-Kamchatka region, English Transl., Bull. Acad. Sci. USSR, Geophys. Ser., 10, 1033– 1037, 1959. Koning, L. P. G., Earthquakes in relation to their geographical distribution, depth and magnitude, 3, the southwestern Pacific, Koninkl. Ned. Akad. Wetenschap. Proc., Ser. B, 55, 194– 206, 1952. Kuo, J., J. Brune, M. Major, Rayleigh wave dispersion in the Pacific Ocean for the period range 20 to 140 seconds, Bull. Seismol. Soc. Am., 52, 333– 357, 1962. Ladd, H. S., The geology of Viti Levu (Fiji), Bull. Bishop Museum, Honolulu, 119, 236, 1934. Macdonald, G. A., Petrography of the Wallis Islands, Bull. Geol. Soc. Am., 56, 861– 872, 1945. Macdonald, G. A., Notes on Niuaf'ou, Am. J. Sci., 246, 65– 77, 1948. Macdonald, G. A., Hawaiian petrographic province, Bull. Geol. Soc. Am., 60, 1541– 1596, 1949. McIntyre, D. B., J. M. Christie, The kinematics of faulting from seismic data, Bull. Geol. Soc. Am., 63, 645– 652, 1957. Menard, H. W., Marine Geology of the Pacific, 271, McGraw-Hill Book Company, New York, 1964. Niazi, M., D. L. Anderson, Upper mantle structure of western North America from apparent velocity of P waves, J. Geophys. Res., 70, 4633– 4640, 1965. Orowan, E., Continental drift and the origin of mountains, Science, 146, 1003– 1010, 1964. Raitt, R. W., R. L. Fisher, R. G. Mason, Tonga trench, Geol. Soc. Am. Spec. Paper, 62, 237– 254, 1955. Randall, M. J., Seismic energy generated by a sudden volume change, Bull. Seismol. Soc. Am., 54, 1291– 1298, 1964. Richard, J. J., Catalogue of the Active Volcanoes Of the World including Solfatara Fields, Part 13, Kermadec, Tonga and Samoa, International Association of Volcanology, Rome, 1962. Ritchie, G. S., Sounding profiles between Fiji, Christmas and Tahiti Islands, Deep-Sea Res., 5, 162– 168, 1958. Ruditch, E. M., On the relationship of deep earthquakes of eastern outlying districts of Asia with large crustal structures, Crust of the Pacific Basin, Geophys. Monogr. Ser., 6 G. A. Macdonald, H. Kuno, 52– 59, American Geophysical Union, Washington, D.C., 1962. Solov'ev, S. L., Seismicity of Sakhalin, Bull. Earthquake Res. Inst., Tokyo Univ., 43, 95– 102, 1965. Suyehiro, S., Deep earthquakes in the Fiji region, Papers Meteorol. Geophys., Tokyo, 13, 216– 238, 1962. Sykes, L. R., Seismicity of the South Pacific Ocean, J. Geophys. Res., 63, 5999– 6006, 1963. Sykes, L. R., Deep-focus earthquakes in the New Hebrides region, J. Geophys. Res., 69, 5353– 5355, 1964. Sykes, L. R., The seismicity of the Arctic, Bull. Seismol. Soc. Am., 55, 519– 536, 1965. Sykes, L. R., M. Ewing, The seismicity of the Caribbean region, J. Geophys. Res., 70, 5065– 5074, 1965. Sykes, L. R., M. Landisman, The seismicity of East Africa, the Gulf of Aden and the Arabian and Red seas, Bull. Seismol. Soc. Am., 54, 1927– 1940, 1964. Talwani, M., J. L. Worzel, M. Ewing, Gravity anomalies and crustal section across the Tonga trench, J. Geophys. Res., 66, 1265– 1278, 1961. Thompson, J. A., Volcanoes of the New Zealand-Tonga volcanic zone, New Zealand J. Sci. Technol., 8, 354– 371, 1926. Tobin, D. G., L. R. Sykes, Relationship of hypocenters of earthquakes to the geology of Alaska, J. Geophys. Res., 71, 1659– 1667, 1966. Tokarev, P. I., O Glubinnoǐ fokahnoǐ poverkhnosti i sviazi zemletriaseniy s relefom v Kurilo-Kamchatskoǐ zone (On the deep focal surface and connections of earthquakes in the Kuril-Kamchatka zone), Bull Volcanol. Sta., Acad. Sci. USSR, 27, 66– 81, 1958. Tsuboi, C., Earthquake energy, earthquake volume, aftershock area and strength of the earth's crust, J. Phys. Earth, 4, 63– 66, 1956. Turner, H. H., On the arrival of earthquake waves at the antipodes, and the measurement of the focal depth of an earthquake, Monthly Notices Roy. Astron. Soc., Geophys. Suppl., 1, 1– 13, 1922. Udintzev, G. B., Relef Kurilo-Kamchatskoǐ Vladiny, Tr. Inst. Okeanol. Akad. Nauk SSSR, 12, 16– 61, 1955. Utsu, T., A statistical study on the occurrence of aftershocks, Geophys. Mag., 30, 521– 605, 1961. Wadati, K., On the activity of deep-focus earthquakes in the Japan Islands and neighborhoods, Geophys. Mag., 8, 305– 325, 1935. Wilson, J. T., Pattern of uplifted islands in the main ocean basins, Science, 139, 591– 594, 1963. Citing Literature Volume71, Issue1215 June 1966Pages 2981-3006 ReferencesRelatedInformation