The earthquake swarms occurred at seven areas distributed in the Kanto district and foreshocks preceding the Izu-Oshima-kinkai earthquake (M=7.0) of 1978 are studied through the analysis of waveform. The earthquakes in a given swarm activity usually share a similar waveform, and the arrival times for certain isolated waves measured from the P-wave onset of their events are the same within the deviation of 0.1 sec. Especially when earth- quakes of similar size are compared, their waveforms frequently coincide from P-wave onset till coda waves. Similar behavior, but with different waveforms are seen for earthquake swarms occurring in other areas. On the other hand, the waveform of foreshocks differs significantly from event to event even if the events occurred within a short time interval (e.g., 1 hour). If such features are always observed, the present results will be useful for the discrimination of swarm activity from other earthquake activity such as the foreshocks of a major earthquake.
雑誌名
東京大學地震研究所彙報 = Bulletin of the Earthquake Research Institute, University of Tokyo
巻
54
号
2
ページ
309 - 315
発行年
1979-12-25
ISSN
00408972
書誌レコードID
AN00162258
フォーマット
application/pdf
日本十進分類法
453
出版者
東京大学地震研究所
出版者別名
Earthquake Research Institute, University of Tokyo
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地震波形の相似性からみた前震と群発地震の違いについて(序報)
ji0542003.pdf
(399.02KB)
