【10/4更新】2022年4月1日からのCiNii ArticlesのCiNii Researchへの統合について

Dynamic Earthquake Triggering in Southern California in High Resolution: Intensity, Time Decay, and Regional Variability

HANDLE オープンアクセス
  • 宮澤, 理稔
    Disaster Prevention Research Institute, Kyoto University; Department of Earth & Planetary Sciences, University of California Santa Cruz
  • Brodsky, Emily E.
    Department of Earth & Planetary Sciences, University of California Santa Cruz
  • Guo, Huiyun
    Department of Earth & Planetary Sciences, University of California Santa Cruz

抄録

Earthquake triggering by seismic waves has been recognized as a phenomenon for nearly 30 years. However, our ability to study dynamic triggering has been limited by our ability to capture the triggering stresses accurately and record the resultant earthquakes. Here we use full waveforms from a dense seismic network and a modern, high‐resolution seismic catalog to measure triggering in Southern California from 2008 to 2017 based on interevent time ratios. We find that the fractional seismicity rate change, which we term triggering intensity or triggerability, as a function of peak strain change for the period of ∼20 s due to distant earthquakes is monotonically increasing and compatible with earlier measurements made with a disjoint data set from 1984 to 2008. A triggering strain of 1 microstrain is equivalent to the local productivity generated by an M1.8 earthquakes. This result implies that a prediction of seismicity rate changes can be made based on recorded ground shaking using the same formalism as currently used for aftershock prediction. For a teleseismic event, this small level of triggering occurs throughout the region and thus aggregates to a regional effect. We find that the triggering rate decays after the triggerer follows an Omori‐Utsu law, but at a much slower rate than a typical aftershock sequence. The slow decay rate suggests that an ancillary process such as creep or fluid flow must be part of dynamic triggering. The prevalence of triggering in areas of creep or fluid involvement reinforces this inference. A triggering cascade of secondary earthquakes is insufficient to explain the data.

遠地地震によって誘発される地震活動の特徴を解明 --地震ビッグデータ解析を通じて--. 京都大学プレスリリース. 2021-05-06.

収録刊行物

  • AGU Advances

    AGU Advances 2 (2), 2021-06

    American Geophysical Union (AGU)

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詳細情報

  • CRID
    1050851010431661696
  • HANDLE
    2433/262768
  • 本文言語コード
    en
  • 資料種別
    journal article
  • データソース種別
    • IRDB
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