Scaling relation between earthquake magnitude and the departure time from <i>P</i> wave similar growth

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書誌事項

公開日
2016-09-15
権利情報
  • http://onlinelibrary.wiley.com/termsAndConditions#vor
DOI
  • 10.1002/2016gl070069
公開者
American Geophysical Union (AGU)

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説明

<jats:title>Abstract</jats:title><jats:p>We introduce a new scaling relation between earthquake magnitude (<jats:italic>M</jats:italic>) and a characteristic of initial <jats:italic>P</jats:italic> wave displacement. By examining Japanese K‐NET data averaged in bins partitioned by <jats:italic>M<jats:sub>w</jats:sub></jats:italic> and hypocentral distance, we demonstrate that the <jats:italic>P</jats:italic> wave displacement briefly displays similar growth at the onset of rupture and that the departure time (<jats:italic>T</jats:italic><jats:sub>dp</jats:sub>), which is defined as the time of departure from similarity of the absolute displacement after applying a band‐pass filter, correlates with the final <jats:italic>M</jats:italic> in a range of 4.5 ≤ <jats:italic>M<jats:sub>w</jats:sub></jats:italic> ≤ 7. The scaling relation between <jats:italic>M</jats:italic><jats:sub>w</jats:sub> and <jats:italic>T</jats:italic><jats:sub>dp</jats:sub> implies that useful information on the final <jats:italic>M</jats:italic> can be derived while the event is still in progress because <jats:italic>T</jats:italic><jats:sub>dp</jats:sub> occurs before the completion of rupture. We conclude that the scaling relation is important not only for earthquake early warning but also for the source physics of earthquakes.</jats:p>

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