論文

査読有り 筆頭著者 責任著者 本文へのリンクあり 国際共著 国際誌
2021年7月

Two end-member earthquake preparations illuminated by foreshock activity on a meter-scale laboratory fault

Nature Communications
  • Futoshi Yamashita
  • ,
  • Eiichi Fukuyama
  • ,
  • Shiqing Xu
  • ,
  • Hironori Kawakata
  • ,
  • Kazuo Mizoguchi
  • ,
  • Shigeru Takizawa

12
1
記述言語
掲載種別
研究論文(学術雑誌)
DOI
10.1038/s41467-021-24625-4
出版者・発行元
Springer Science and Business Media LLC

<title>Abstract</title>The preparation process of natural earthquakes is still difficult to quantify and remains a subject of debate even with modern observational techniques. Here, we show that foreshock activity can shed light on understanding the earthquake preparation process based on results of meter-scale rock friction experiments. Experiments were conducted under two different fault surface conditions before each run: less heterogeneous fault without pre-existing gouge and more heterogeneous fault with pre-existing gouge. The results show that fewer foreshocks occurred along the less heterogeneous fault and were driven by preslip; in contrast, more foreshocks with a lower <italic>b</italic> value occurred along the more heterogeneous fault and showed features of cascade-up. We suggest that the fault surface condition and the stress redistribution caused by the ongoing fault slip mode control the earthquake preparation process, including the behavior of foreshock activity. Our findings imply that foreshock activity can be a key indicator for probing the fault conditions at present and in the future, and therefore useful for assessing earthquake hazard.

リンク情報
DOI
https://doi.org/10.1038/s41467-021-24625-4 本文へのリンクあり
共同研究・競争的資金等の研究課題
地震破壊伝播機構解明のための長大岩石摩擦実験研究
共同研究・競争的資金等の研究課題
低速変形から高速すべりまでの地球科学的モデル構築
URL
http://www.nature.com/articles/s41467-021-24625-4.pdf 本文へのリンクあり
URL
http://www.nature.com/articles/s41467-021-24625-4
ID情報
  • DOI : 10.1038/s41467-021-24625-4
  • eISSN : 2041-1723
  • ORCIDのPut Code : 96966421
  • 共同研究・競争的資金等の研究課題の業績ID : 30110261
  • 共同研究・競争的資金等の研究課題の業績ID : 30110262

エクスポート
BibTeX RIS