Non-volcanic crustal movements of the northernmost Philippine Sea plate detected by the GPS-acoustic seafloor positioningReportar como inadecuado




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Earth, Planets and Space

, 67:184

6. Geodesy

Abstract

Repeatedly performing the GPS-acoustic seafloor positioning, we first succeeded in detecting non-volcanic seafloor movements on the Philippine Sea plate PHS subducting along the Sagami Trough. At a seafloor geodetic site on the northernmost part of the PHS off the Boso Peninsula, we detected significant eastward motion with respect to the central part of the PHS. This is unaccountable by the coupling between the Pacific plate and the PHS along the Izu-Bonin Ogasawara Trench because it would cause the westward elastic deformation at BOSS. It is rather consistent with the rigid motion of the tectonic block in the fore-arc along the Izu-Bonin Trench, associated with the back-arc rift. The other site on the western side of the Sagami Bay had moved toward the north relative to the Izu Peninsula. It suggests that the Izu microplate obviously moves relative to the northern PHS. The difference between the velocities of the Sagami Bay and the Izu Peninsula indicates the coupling on the boundary fault as well.

KeywordsGPS-acoustic Seafloor geodetic observation Philippine Sea plate Sagami Trough Izu arc Izu microplate Plate motion AbbreviationsCLconfidence level

CTDconductivity temperature depth profiler

EUEurasian plate

GEONETGNSS Earth Observation Network System

GNSSglobal navigation satellite system

GPSglobal positioning system

IAIzu arc block

IMIzu microplate

ITRFInternational Terrestrial Reference Frame

JCGJapan Coast Guard

NANorth American plate

PACPacific plate

PHSPhilippine Sea plate

XCTDexpendable conductivity temperature depth profiler

XBTexpendable bathythermograph

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Autor: Shun-ichi Watanabe - Tadashi Ishikawa - Yusuke Yokota

Fuente: https://link.springer.com/







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