Variability in earthquake stress drop and apparent stress

被引:150
作者
Baltay, Annemarie [1 ]
Ide, Satoshi [2 ]
Prieto, German [3 ]
Beroza, Gregory [1 ]
机构
[1] Stanford Univ, Dept Geophys, Stanford, CA 94305 USA
[2] Univ Tokyo, Dept Earth & Planetary Sci, Bunkyo Ku, Tokyo 1130033, Japan
[3] Univ Los Andes, Dept Fis, Bogota 4976, Colombia
关键词
SEISMIC ENERGY; MID-NIIGATA; JAPAN; MOMENT; FAULT;
D O I
10.1029/2011GL046698
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
We apply empirical Green's function coda-based analysis to four earthquake sequences in Japan that span a magnitude range of 1.8 to 6.9, to measure radiated energy, corner frequency and stress drop. We find no systematic dependence of apparent stress or stress drop on seismic moment for these sequences, and find they both are log-normally distributed; however, we identify several anomalous events-both energetic and enervated-that show sharply different spectral signatures from the rest of the population. These events indicate that much of the variation in apparent stress and stress drop is statistically significant, which may have important implications for seismic hazard analysis. Citation: Baltay, A., S. Ide, G. Prieto, and G. Beroza (2011), Variability in earthquake stress drop and apparent stress, Geophys. Res. Lett., 38, L06303, doi: 10.1029/2011GL046698.
引用
收藏
页数:6
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