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Titolo:
Regional seismicity and on-land deformation in the Ryukyu arc: Implications for the kinematics of opening of the Okinawa Trough
Autore:
Fournier, M; Fabbri, O; Angelier, J; Cadet, JP;
Indirizzi:
Univ Paris 06, CNRS, Lab Tecton, ESA 7072, F-75252 Paris 05, France Univ Paris 06 Paris France 05 Tecton, ESA 7072, F-75252 Paris 05, France Univ Franche Comte, Dept Geosci, F-25030 Besancon, France Univ Franche Comte Besancon France F-25030 sci, F-25030 Besancon, France
Titolo Testata:
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
fascicolo: B7, volume: 106, anno: 2001,
pagine: 13751 - 13768
SICI:
0148-0227(20010710)106:B7<13751:RSAODI>2.0.ZU;2-6
Fonte:
ISI
Lingua:
ENG
Soggetto:
INDIA-EURASIA COLLISION; MOMENT TENSOR SOLUTIONS; JAPAN SEA; PALEOMAGNETIC EVIDENCE; SOUTHWEST JAPAN; ISLAND-ARC; BASIN; TECTONICS; KYUSHU; ROTATION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
66
Recensione:
Indirizzi per estratti:
Indirizzo: Fournier, M Univ Paris 06, CNRS, Lab Tecton, ESA 7072, Case 129,4 Pl Jussieu, F-75252 Paris 05, France Univ Paris 06 Case 129,4 Pl Jussieu Paris France 05 5, France
Citazione:
M. Fournier et al., "Regional seismicity and on-land deformation in the Ryukyu arc: Implications for the kinematics of opening of the Okinawa Trough", J GEO R-SOL, 106(B7), 2001, pp. 13751-13768

Abstract

The stress field evolution and the kinematics of opening of the Okinawa Trough are investigated on the basis of earthquake focal mechanisms and structural data in the Ryukyu are and the Okinawa Trough. Focal mechanisms show that the crust underlying the are and the trough undergoes extension along two suborthogonal directions: a regional are-perpendicular extension and a local al c-parallel extension. Both extensions are concurrent and related to the same regional stress field characterized by permutating horizontal sigma (2) and sigma (3) axes. Earthquake slip vectors reveal a southward motion of the Ryukyu are with respect to the south China block. The current pole of opening of the Okinawa Trough is located around 16 degreesN and 50 degreesE. Fracture analysis in Okinawa island allows identification of three episodes of extension: a late Miocene N40 degreesW to N20 degreesE extension(episode I), a late Pliocene to early Pleistocene N20 degreesE extension (episode II), and a latest Pleistocene to present-day N20 degreesW extension(episode III). Episodes II and III are characterized by permutations between the two horizontal sigma (2) and sigma (3) axes. By synthesizing regional deformation data and by comparing the geometry of the deformation with analogue models of oblique rifting we reconstruct the kinematics of opening of the Okinawa Trough since the late Miocene. The direction of divergence ofthe Ryukyu are has rotated clockwise from -N150 degreesE in the late Miocene to nearly N-S today.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 14/07/20 alle ore 10:07:24