Determination of epicenters before earthquakes utilizing far seismic and GNSS data: Insights from ground vibrations

Chieh Hung Chen, Li Ching Lin, Ta Kang Yeh, Strong Wen, Huaizhong Yu, Chen Yu, Yongxin Gao, Peng Han, Yang Yi Sun, Jann Yenq Liu, Cheng Horng Lin, Chi Chia Tang, Che Min Lin, Hung Hao Hsieh, Pin Ji Lu

Research output: Contribution to journalLetterpeer-review

20 Scopus citations

Abstract

Broadband seismometers, ground-based Global Navigation Satellite Systems (GNSS), and magnetometers that were located within an epicentral distance of approximately 150 km consistently observed the novel anomalous behaviors of the common-mode ground vibrations approximately 5–10 days before the M6.6 Meinong earthquake in Taiwan. The common-mode ground vibrations with amplitudes near 0.1 m at frequencies ranging from 8 × 10−5 to 2 × 10−4 Hz were generated near the region close to the epicenter of the impending earthquake. The common-mode vibrations were consistently observed in seismic and GNSS data associated with five other earthquakes in four distinct areas. The results reveal that the common-mode vibrations could be a typical behavior before earthquakes. The causal mechanism of common-mode vibrations can be attributed to crustal resonance excitations before fault dislocations occur. Potential relationships with other pre-earthquake anomalies suggest that the common-mode vibrations could be ground motion before earthquakes, which was investigated for a significant length of time.

Original languageEnglish
Article number3252
Pages (from-to)1-13
Number of pages13
JournalRemote Sensing
Volume12
Issue number19
DOIs
StatePublished - 1 Oct 2020

Keywords

  • Common-mode ground vibrations
  • Pre-earthquake anomalous phenomena
  • Pre-earthquake ground motion

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