Crustal-scale weak zone along a collisional suture revealed by spatial variations in velocity structures and seismicity

Kwang Hee Kim, Kou Cheng Chen, Jer Ming Chiu, Horng Yuan Yen

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

High-quality first-arrival data collected with a high-density temporary seismic array and regional seismic network were used to construct a P-wave velocity model and identify the precise location of earthquakes in the active collision zone of southeastern Taiwan. A crustal-scale weak zone, defined by high seismicity, is characterized by a steeply east-dipping lower-velocity anomaly and represents a boundary between an uplifted upper-mantle and the Luzon volcanic arc. The main features of the weak zone, with its associated low-velocity zone and seismicity pattern, vary significantly along the collisional boundary of southeastern Taiwan. Along the weak zone, unlithified sediments or highly fractured materials are compacted as the Philippine Sea plate moves toward the Eurasian plate. In areas of more advanced collision, soft material is more compacted and can therefore store significantly greater amounts of strain energy. This energy is released through episodic earthquakes.

Original languageEnglish
Pages (from-to)436-444
Number of pages9
JournalBulletin of the Seismological Society of America
Volume102
Issue number1
DOIs
StatePublished - Feb 2012

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