气候变化领域集成服务门户(CCPortal): Moment-Duration Scaling of Low-Frequency Earthquakes in Guerrero, Mexico

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DOI	10.1029/2019JB019099
	Moment-Duration Scaling of Low-Frequency Earthquakes in Guerrero, Mexico
	Farge G.; Shapiro N.M.; Frank W.B.
发表日期	2020
ISSN	21699313
卷号	125 期号:8
英文摘要	Low-frequency earthquakes (LFEs) are detected within tremor, as small, repetitive, impulsive low-frequency (1–8 Hz) signals. While the mechanism causing this depletion of the high-frequency content of their signal is still debated, this feature may indicate that the source processes at the origin of LFEs are different from those for regular earthquakes. Key constraints on the LFE-generating physical mechanisms can be obtained by establishing scaling laws between their seismic moment and source durations. Here we apply a simple spectral analysis method to the S waveforms of LFEs from Guerrero, Mexico, to measure their seismic moments and corner frequencies, a proxy to source duration. We find characteristic values of M0∼3×1012 N.m (Mw∼2.3) and fc∼3.0 Hz with the corner frequency very weakly dependent on the seismic moment. This moment-duration scaling observed for Mexican LFEs is similar to one previously reported in Cascadia and is very different from the established one for regular earthquakes. This suggests that they could be generated by sources of nearly constant size with strongly varying intensities. LFEs do not exhibit the self-similarity characteristic of regular earthquakes, suggesting that the physical mechanisms at their origin could be intrinsically different. © 2020. American Geophysical Union. All Rights Reserved.
英文关键词	Guerrero; low-frequency earthquakes; Mexico; self-similarity; slow earthquakes
语种	英语
来源期刊	Journal of Geophysical Research: Solid Earth
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/187718
作者单位	Université de Paris, Institut de Physique du Globe de Paris, CNRS, Paris, F-75005, France; Schmidt Institute of Physics of the Earth, Russian Academy of Sciences, Moscow, Russian Federation; Institut de Sciences de la Terre, Université Grenoble Alpes, CNRS (UMR5275), Grenoble, France; Department of Earth Sciences, University of Southern California, Los Angeles, CA, United States; Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA, United States
推荐引用方式 GB/T 7714	Farge G.,Shapiro N.M.,Frank W.B.. Moment-Duration Scaling of Low-Frequency Earthquakes in Guerrero, Mexico[J],2020,125(8).
APA	Farge G.,Shapiro N.M.,&Frank W.B..(2020).Moment-Duration Scaling of Low-Frequency Earthquakes in Guerrero, Mexico.Journal of Geophysical Research: Solid Earth,125(8).
MLA	Farge G.,et al."Moment-Duration Scaling of Low-Frequency Earthquakes in Guerrero, Mexico".Journal of Geophysical Research: Solid Earth 125.8(2020).