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Titolo:
Crustal velocity field of southwest Japan: Subduction and arc-arc collision
Autore:
Miyazaki, S; Heki, K;
Indirizzi:
Geog Survey Inst, Geog & Crustal Dynam Res Ctr, Tsukuba, Ibaraki 3050811, Japan Geog Survey Inst Tsukuba Ibaraki Japan 3050811 ba, Ibaraki 3050811, Japan Natl Astron Observ, Mizusawa Astrogeodynam Observ, Div Earth Rotat, Mizusawa City, Iwate 0230861, Japan Natl Astron Observ Mizusawa City Iwate Japan0230861 Iwate 0230861, Japan
Titolo Testata:
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
fascicolo: B3, volume: 106, anno: 2001,
pagine: 4305 - 4326
SICI:
0148-0227(20010310)106:B3<4305:CVFOSJ>2.0.ZU;2-B
Fonte:
ISI
Lingua:
ENG
Soggetto:
BASE-LINE INTERFEROMETRY; AMURIAN PLATE MOTION; NANKAI TROUGH; CONTINENTAL COLLISION; STRAIN ACCUMULATION; CENTRAL CALIFORNIA; GPS MEASUREMENTS; GEODETIC DATA; FAULT SLIP; DEFORMATION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
65
Recensione:
Indirizzi per estratti:
Indirizzo: Miyazaki, S Geog Survey Inst, Geog & Crustal Dynam Res Ctr, Kitasato 1, Tsukuba, Ibaraki 3050811, Japan Geog Survey Inst Kitasato 1 Tsukuba Ibaraki Japan 3050811 apan
Citazione:
S. Miyazaki e K. Heki, "Crustal velocity field of southwest Japan: Subduction and arc-arc collision", J GEO R-SOL, 106(B3), 2001, pp. 4305-4326

Abstract

We investigate crustal deformation in southwest japan over a 3-year periodrevealed by a permanent dense Global Positioning System (GPS) array. Southwest Japan is a part of the Amurian Plate, a microplate moving about 10 mm/yr toward the east with respect to the Eurasian Plate. It overrides the Philippine Sea Plate at the Nankai Trough and collides with the northeast Japan are in the central part of Japan. In this paper we first derive GPS site velocities relative to the stable part of the Amurian Plate in order to isolate signals of crustal deformation caused by the subduction and/or the collision. The velocity field has a conspicuous feature indicating the interseismic elastic loading by the Philippine Sea Plate slab at the Nankai Trough, characterized by the northwestward movements of points throughout the studied area. Their amplitudes are the largest at the Pacific coast and decay toward the Japan Sea coast with a subtle systematic shift of azimuths. A model assuming an elastic half-space, the convergence rate at the Nankai Trough based on a refined Euler vector, and the strength of the coupling inferred from a thermal model, could explain the velocity field in the western part of the studied area to a large extent. Those in the eastern part systematically deviate from them, and the residual components there show east-westshortening and north-south extension. This may represent crustal thickening and trenchward extrusion of crustal blocks caused by the collision between southwest and northeast Japan. This suggests that the collision between southwest and northeast Japan gives rise to not only crustal thickening but also trenchward extrusion of crustal block. A velocity contrast was found across the Median Tectonic Line, the largest inland active fault in Japan, but the current permanent GPS network is not dense enough for us to discuss its coupling depth.

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Documento generato il 20/01/20 alle ore 07:36:43