Preprints
https://doi.org/10.5194/nhess-2022-242
https://doi.org/10.5194/nhess-2022-242
 
12 Oct 2022
12 Oct 2022
Status: this preprint is currently under review for the journal NHESS.

Spatiotemporal seismicity pattern of the Taiwan orogen

Yi-Ying Wen1,2, Chien-Chih Chen3,4, Strong Wen1,2, and Wei-Tsen Lu1 Yi-Ying Wen et al.
  • 1Department of Earth and Environmental Sciences, National Chung Cheng University, Chia-yi County 62102, Taiwan
  • 2Environment and Disaster Monitoring Center, National Chung Cheng University, Chia-yi County 62102, Taiwan
  • 3Department of Earth Sciences, National Central University, Taoyuan City 32001, Taiwan
  • 4Earthquake-Disaster & Risk Evaluation and Management Center, National Central University, Taoyuan City 32001, Taiwan

Abstract. We investigate the temporal and spatial seismicity patterns prior to eight M>6 events nucleating in different regions of Taiwan through a region-time-length algorithm and an analysis of a self-organizing spinodal model. Our results reveal that the spatiotemporal seismicity variations during the preparation process of impending earthquakes display distinctive patterns corresponding to tectonic settings. Q-type events occur in southern Taiwan and experience a seismic quiescence stage prior to the mainshock. A seismicity decrease of 2.5<M<4.5 events occurs around the high b-value southern Central Range, which contributes to the accumulation of tectonic stress for preparing for the occurrence of the Q-type event. On the other hand, A-type events occur in central Taiwan and experience a seismic activation stage prior to the mainshock, which nucleates on the edge of the seismic activation area. We should consider when accelerating seismicity of 3<M<5 events appears within the low b-value area, which could promote the nucleation process of the A-type event.

Yi-Ying Wen et al.

Status: open (extended)

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  • RC1: 'Comment on nhess-2022-242', Anonymous Referee #1, 05 Dec 2022 reply

Yi-Ying Wen et al.

Yi-Ying Wen et al.

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Short summary
Knowing the spatiotemporial seismicity patterns prior to impending large earthquakes might help to the earthquake hazard assessment. Several recent moderate earthquakes occurred in the various regions of Taiwan, which help to further investigate the spatiotemporal seismic pattern related to the regional tectonic stress. We should pay attention when seismicity decrease of 2.5<M<4.5 events around southern Central Range, or the accelerating seismicity of 3<M<5 events appears in central Taiwan.
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