Preprints
https://doi.org/10.5194/nhess-2022-114
https://doi.org/10.5194/nhess-2022-114
 
31 Mar 2022
31 Mar 2022
Status: this discussion paper is a preprint. It has been under review for the journal Natural Hazards and Earth System Sciences (NHESS). The manuscript was not accepted for further review after discussion.

Spatiotemporial 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 region of Taiwan through region-time-length algorithm and analysis of self-organizing spinodal model. Our results reveal that the spatiotemporial seismicity variations during the preparation process of impending earthquakes would display distinctive pattern corresponding to the tectonic setting. Q-type events occur in southern Taiwan and experience seismic quiescence stage prior to the mainshock. Seismicity decrease of 2.5 < M < 4.5 events around the high b-value southern Central Range, which contributes to accumulate the tectonic stress for preparing the occurrence of the Q-type event. On the other hand, A-type events occur in central Taiwan and experience seismic activation stage prior to the mainshock, which nucleated on the edge of the seismic activation area. We should pay attention when accelerating seismicity of 3 < M < 5 events appears within the low b-value area, which would promote the nucleation process of the A-type event.

Yi-Ying Wen et al.

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on nhess-2022-114', Anonymous Referee #1, 18 Apr 2022
    • AC1: 'Reply on RC1', Yi-Ying Wen, 03 Jun 2022
  • RC2: 'Comment on nhess-2022-114', Anonymous Referee #2, 21 Apr 2022
    • AC2: 'Reply on RC2', Yi-Ying Wen, 03 Jun 2022

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on nhess-2022-114', Anonymous Referee #1, 18 Apr 2022
    • AC1: 'Reply on RC1', Yi-Ying Wen, 03 Jun 2022
  • RC2: 'Comment on nhess-2022-114', Anonymous Referee #2, 21 Apr 2022
    • AC2: 'Reply on RC2', Yi-Ying Wen, 03 Jun 2022

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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