Changes in In-Situ Rock Stress before and after the Major 2011 Tohoku-Oki Earthquake

Kiyotoshi Sakaguchi, Tatsuya Yokoyama

Research output: Contribution to journalConference article

2 Citations (Scopus)

Abstract

To examine the change in in-situ stress between before and after the 2011 Tohoku-oki earthquake, we performed stress measurements after the earthquake in the Kamaishi mine, located near the northern termination of the mainshock rupture. The in-situ stress measurement period was from 1991 to 2016. The results showed that the magnitudes of the three-dimensional principal stresses and the vertical stress drastically increased during the mainshock and, at one year after the earthquake, were more than double those before the earthquake. The principal stress magnitudes then decreased with time, and returned almost to the pre-earthquake levels at about five years after the earthquake. The increasing and decreasing trends in stress in the Kamaishi mine can be interpreted in terms of the effects of coseismic rupture behavior of the Tohoku-oki earthquake mainshock and the occurrence of aftershocks in the Sanriku-oki low-seismicity region (SLSR), where the Kamaishi mine is located.

Original languageEnglish
Pages (from-to)768-775
Number of pages8
JournalProcedia Engineering
Volume191
DOIs
Publication statusPublished - 2017 Jan 1
EventISRM European Rock Mechanics Symposium, EUROCK 2017 - Ostrava, Czech Republic
Duration: 2017 Jun 202017 Jun 22

Keywords

  • CCBO technique
  • rock stress measurement
  • stress change
  • the 2011 Tohoku-oki earthquake

ASJC Scopus subject areas

  • Engineering(all)

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