Fortnightly modulation of San Andreas tremor and low-frequency earthquakes

van der Elst Nicholas J.; Delorey Andrew A.; Shelly David R.Johnson Paul A.

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Fortnightly modulation of San Andreas tremor and low-frequency earthquakes

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摘要

Earth tides modulate tremor and low-frequency earthquakes (LFEs) on faults in the vicinity of the brittle-ductile (seismic-aseismic) transition. The response to the tidal stress carries otherwise inaccessible information about fault strength and rheology. Here, we analyze the LFE response to the fortnightly tide, which modulates the amplitude of the daily tidal stress over a 14-d cycle. LFE rate is highest during the waxing fortnightly tide, with LFEs most strongly promoted when the daily stress exceeds the previous peak stress by the widest margin. This pattern implies a threshold failure process, with slip initiated when stress exceeds the local fault strength. Variations in sensitivity to the fortnightly modulation may reflect the degree of stress concentration on LFE-producing brittle asperities embedded within an otherwise aseismic fault.

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《Proceedings of the National Academy of Sciences of the United States of America.》 |2016年第31期|8601-8605|共5页
作者
van der Elst Nicholas J.; Delorey Andrew A.; Shelly David R.Johnson Paul A.;
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作者单位

US Geol Survey, Earthquake Sci Ctr, Pasadena, CA 91106 USA;

Los Alamos Natl Lab, Geophys Grp, Los Alamos, NM 87545 USA;

US Geol Survey, Volcano Sci Ctr, Menlo Pk, CA 94025 USA;

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收录信息美国《科学引文索引》(SCI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
原文格式 PDF
正文语种英语
中图分类自然科学总论;
关键词
faults; low-frequency earthquakes; tidal triggering; fortnightly tides;

Fortnightly modulation of San Andreas tremor and low-frequency earthquakes

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