Tidal Response in Shallow Tectonic Tremors

S. Katakami, Y. Yamashita, H. Yakihara, H. Shimizu, Y. Ito, K. Ohta

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

Various types of slow earthquakes (e.g., tectonic tremors and slow slip events) have been reported in tectonic zones, especially in the subduction zone. The tidal response of a tremor is considered to be strongly related to the weak friction state of the plate interface, and many studies have reported observational evidence of such correlation between tides and deep tremor activity. Here we used the modified frequency scanning method at a single station to detect micro tectonic tremors that have not been previously reported in southern Kyushu. In the early stage of the tremor activity, tremors are mostly modulated by slow slip events. In contrast, we found a seismic response to ocean tides during the later stage in the shallower part of the subduction zone. This might indicate that the tremors are triggered by tidal changes caused by fault weakening due to slow slip events as same as deeper condition.

Original languageEnglish
Pages (from-to)9699-9706
Number of pages8
JournalGeophysical Research Letters
Volume44
Issue number19
DOIs
Publication statusPublished - Oct 16 2017

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Earth and Planetary Sciences(all)

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