Research on distinguishing method and mechanism of tidal deformation anomalies before large earthquakes

Jing Zhang*, Rong Hua Chen, Lin Zhang Yang, Ping Ji

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

By analyzing the digital tilt tidal observations at Yongsheng station and strain tidal observations at Houma station, this paper suggests that the solid tidal force might trigger tiny abrupt deformation when the seismogenic system enters into an instable critical state. The step and abrupt changes correlate to a certain extent to the direction of tidal force and the orientation and size of tidal shear stress along the fault strike. In the paper, we study for the first time the relationship between deformation anomaly and additional tidal stress in order to approach the physical mechanism of anomalies appeared immediately before earthquakes and the distinguishing method.

Original languageEnglish
Pages (from-to)155-162
Number of pages8
JournalActa Seismologica Sinica English Edition
Volume19
Issue number2
DOIs
Publication statusPublished - Mar 2006
Externally publishedYes

Keywords

  • Deformation anomaly
  • Tidal force
  • Trigger

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