Digital Elevation Model Offshore Taiwan and Its Tectonic Implications

臺灣海域數值地形模式及其在大地構造上之意義

劉家瑄(Char-Shine Liu) ； 劉紹勇(Shao-Yung Liu) ； Serge E. Lallemand ； Neil Lundberg ； Donald L. Reed

《Terrestrial, Atmospheric and Oceanic Sciences》 9卷4期 (1998/12) Pp. 705-738

並列摘要

Taiwan is an active and complex tectonic region with earthquakes occurringas a response to collision between the Philippine Sea and the Eurasianplates.Furthermore,the northward subduction of the Philippine Seaplate in northern Taiwan and the eastward subduction of the Eurasian platein southernmost Taiwan are significant seismogenic zones.Significant seismichazards in Taiwan may either be induced by the plate boundary activitiesassociated with lithospheric friction in the shallow part of the subductionzones at either end of Taiwan or by the intraplate activities due to platecollision.In the latter category,specially recognized as seismic sources forhazard consideration are the blind thrusts in the Western Foothills and theCoastal Plain.Similar to the 1994 Northridge earthquake,such events couldbe quite hazardous because the seismic sources are directly under populatedurban areas.The subduction zone offshore of northern Taiwan iscapable of producing M(subscript w)＞7.5 events,but much of the source zone will lieoffshore.The southern subduction zone extends under the Hengchun Peninsula,but the seismicity appears to be relatively low.Also to be noted arelong-term seismicity patterns,such as the NW-trending belt of events betweenMiaoli and Puli is that extends from near the surface to depths greaterthan 40 km.The Longitudinal Valley faults and the Meishan fault are wellknown.A better understanding of the potential seismogenic structures suchas the Longitudinal Valley fault system and Meishan fault may help us inproposing appropriate long term measures to mitigate seismic hazards.

並列關鍵字

Digital Elevation Model ； Swath Bathymetry ； Seafloor Morphology ； Morphotectonic Structures ； Taiwan Offshore Region