Transition of the Taiwan-Ryukyu collision-subduction process as revealed by ocean-bottom seismometer observations

Shao Jinn Chin, Jing Yi Lin, Yen Fu Chen, Wen Nan Wu, Chin Wei Liang

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

Located at the arc-continental collision region between the Eurasian (EP) and Philippine Sea Plates (PSP), Taiwan is usually considered to have a complex tectonic environment, particularly along the eastern coast of the island. To gain a better understanding of the geological evolution of the east Taiwan area, the data from 8 Ocean Bottom Seismometers (OBS) acquired during the Across Taiwan Strait Explosion Experiment in 2012 and 14 inland seismic stations were used to determine a more detailed and accurate distribution of marine earthquakes. Based on the 333 relocated earthquakes and available geophysical data, we suggest two main tectonic boundaries for eastern Taiwan. South of 23.25°N, the homogeneous distribution of earthquakes in the crustal portion for both the inland and offshore areas suggests an ongoing collisional process. North of this location, between approximately 23.25°N and 23.8°N, the abrupt increasing of seismicity depth infers that the underthrusted arc/fore-arc material is deforming due to the collisional compression at depth. In this segment, the subsidence of the arc/fore-arc area determines the transition from collision to subduction. North of 23.8°N, the northwestern dipping PSP is well illustrated by the seismicity both onshore and offshore, indicating a dominant subduction process.

Original languageEnglish
Pages (from-to)149-157
Number of pages9
JournalJournal of Asian Earth Sciences
Volume128
DOIs
StatePublished - 1 Oct 2016

Keywords

  • Arc-continental collision
  • Ocean Bottom Seismometer
  • Seismicity
  • Subduction
  • Taiwan

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