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Asymmetrical Seismic Pulses before a Large Earthquake
Journal of Volcanology and Seismology ( IF 0.7 ) Pub Date : 2019-05-13 , DOI: 10.1134/s074204631901007x
G. A. Sobolev , N. A. Zakrzhevskaya , S. M. Kireenkova

Abstract

This study is concerned with the behavior of seismic noise in the period range of a few minutes based on records made by broadband IRIS stations before the catastrophic earthquake of March 11, 2011 in Japan. A formalized technique was used to identify discrete asymmetrical pulses whose amplitudes were an order of magnitude higher than the noise level and that were spaced at intervals longer than 30 minutes. The frequency of pulses at the MAJO station on Honshu 400 km of the earthquake epicenter increased on January 30, 2011 and remained high until March 2, 2011. No such phenomena have been observed at MAJO in the same periods during the preceding 15 years, when the station was in regular operation. The records of other similar stations farther than 1700 km from the epicenter were not found to contain increases in the rate of pulses. We believe that these asymmetrical pulses were due to dilatancy in shallow crustal layers beneath the MAJO station.


中文翻译:

大地震前的非对称地震脉冲

摘要

根据2011年3月11日日本大地震之前宽带IRIS电台的记录,这项研究与几分钟内的地震噪声行为有关。使用一种形式化的技术来识别离散的不对称脉冲,其幅度比噪声水平高一个数量级,并且间隔的时间超过30分钟。2011年1月30日,本州400 km地震本州MAJO站的脉冲频率增加,并一直保持高位,直到2011年3月2日。在过去15年中,当时的MAJO在同一时期未观察到这种现象。该站处于正常运行状态。距离震中1700 km以外的其他类似台站的记录未发现包含脉冲率的增加。
更新日期:2019-05-13
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