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Titolo:
Westward extension of the Okinawa trough at its western end in the northern Taiwan area: Bathymetric and seismological evidence
Autore:
Wang, CS; Yang, ML; Chou, CP; Chang, YC; Lee, CS;
Indirizzi:
Natl Taiwan Ocean Univ, Inst Appl Geophys, Keelung 202, Taiwan Natl TaiwanOcean Univ Keelung Taiwan 202 l Geophys, Keelung 202, Taiwan Natl Cheng Kung Univ, Tainan Hydraul Lab, Tainan 70101, Taiwan Natl Cheng Kung Univ Tainan Taiwan 70101 draul Lab, Tainan 70101, Taiwan
Titolo Testata:
TERRESTRIAL ATMOSPHERIC AND OCEANIC SCIENCES
fascicolo: 2, volume: 11, anno: 2000,
pagine: 459 - 480
SICI:
1017-0839(200006)11:2<459:WEOTOT>2.0.ZU;2-#
Fonte:
ISI
Lingua:
ENG
Soggetto:
MOMENT TENSOR SOLUTIONS; BACK-ARC BASIN; RYUKYU ARC; COLLISION; EARTHQUAKES; SEISMICITY; TRANSITION; SUBDUCTION; CONTINENT; EVOLUTION;
Keywords:
development of the Okinawa trough; detailed bathymetry;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
40
Recensione:
Indirizzi per estratti:
Indirizzo: Wang, CS Natl Taiwan Ocean Univ, Inst Appl Geophys, 2 Pei Ning Rd, Keelung202, Taiwan Natl Taiwan Ocean Univ 2 Pei Ning Rd Keelung Taiwan 202 , Taiwan
Citazione:
C.S. Wang et al., "Westward extension of the Okinawa trough at its western end in the northern Taiwan area: Bathymetric and seismological evidence", TERR ATM OC, 11(2), 2000, pp. 459-480

Abstract

In this paper, we used detailed bathymetry, earthquake distribution and focal mechanisms to study the phenomenon of active westward extension of the Okinawa trough in the northern Taiwan area, We found a distinguishable subsiding and collapsing area on the continental shelf edge and the continentalslope on the northern side of the Okinawa trough, This area extends westwards to at least 121.5 degrees E and includes several morphological units related to the existence and formation of three major canyons, The canyons and the morphological units are still evolving through the sediment transportand through the subsidence and collapse of material due to the formation of the Okinawa trough. According to the degree of development, we found thatthese morphological units have developed from the east to the west, There are two parallel E-W trending central graben at the westernmost part of theOkinawa trough, with each corresponding to a narrow shallow seismic belt, The widths of the central graben are 10-15 km, There is geophysical and geological evidence that the formation of these central graben has been extended westwards to the onland area of Taiwan, Focal mechanisms of earthquakes and the topographic features show that the formation of the Okinawa trough is associated with the down-dip extensional stress along the subducting slab of the Philippine Sea plate, and most of northern Taiwan and all the northeastern offshore area of Taiwan are under tensional stress, New portions of the Okinawa trough have been forming across the whole width at its western end through subsidence in the continental shelf, the continental slope and the traditionally recognized area of the Okinawa trough in the northeastern Taiwan area, to make the Okinawa trough develop gradually and extend westwards.

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Documento generato il 19/07/18 alle ore 13:28:40