Time-domain source parameter estimation of<i>M</i>w 3–7 earthquakes in Japan from a large database of moment-rate functions

DOI DOI DOI PDF PDF 被引用文献6件 参考文献81件
  • Keisuke Yoshida
    Research Center for Prediction of Earthquakes and Volcanic Eruptions, Graduate School of Science, Tohoku University , Sendai 980-8578, Japan
  • Hiroo Kanamori
    Seismological Laboratory, California Institute of Technology , Pasadena, CA 91125, USA

書誌事項

公開日
2023-02-15
資源種別
journal article
権利情報
  • https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model
DOI
  • 10.1093/gji/ggad068
  • 10.1002/essoar.10510900.2
  • 10.1002/essoar.10510900.1
公開者
Oxford University Press (OUP)

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説明

<jats:title>SUMMARY</jats:title><jats:p>Time-domain analyses of seismic waveforms have revealed diverse source complexity in large earthquakes (Mw &gt; 7). However, source characteristics of small earthquakes have been studied by assuming a simple rupture pattern on the frequency domain. This study utilizes high-quality seismic network data from Japan to systematically address the source complexities and radiated energies of Mw 3–7 earthquakes on the time domain. We first determine the apparent moment-rate functions (AMRFs) of the earthquakes using the empirical Green's functions. Some of the AMRFs show multiple peaks, suggesting complex ruptures at multiple patches. We then estimate the radiated energies (ER) of 1736 events having more than ten reliable AMRFs. The scaled energy (eR = ER/M0) does not strongly depend on the seismic moment (M0), focal mechanisms, or depth. The median value of eR is 3.7 × 10−5, which is comparable to those of previous studies; however, eR varies by approximately one order of magnitude among earthquakes. We measure the source complexity based on the radiated energy enhancement factor (REEF). The values of REEF differ among earthquakes, implying diverse source complexity. The values of REEF do not show strong scale dependence for Mw 3–7 earthquakes, suggesting that the source diversity of smaller earthquakes is similar to that of larger earthquakes at their representative spatial scales. Applying a simple spectral model (e.g. the ω2-source model) to complex ruptures may produce substantial estimation errors in source parameters.</jats:p>

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