Annual modulation of triggered seismicity following the 1992 Landers earthquake in California

Stephen S. Gao (), Paul G. Silver, Alan T. Linde and I. Selwyn Sacks
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Stephen S. Gao: Department of Terrestrial Magnetism Carnegie Institution of Washington
Paul G. Silver: Department of Terrestrial Magnetism Carnegie Institution of Washington
Alan T. Linde: Department of Terrestrial Magnetism Carnegie Institution of Washington
I. Selwyn Sacks: Department of Terrestrial Magnetism Carnegie Institution of Washington

Nature, 2000, vol. 406, issue 6795, 500-504

Abstract: Abstract The mechanism responsible for the triggering of earthquakes remains one of the least-understood aspects of the earthquake process. The magnitude-7.3 Landers, California earthquake of 28 June 1992 was followed for several weeks by triggered seismic activity over a large area, encompassing much of the western United States1. Here we show that this triggered seismicity marked the beginning of a five-year trend, consisting of an elevated microearthquake rate that was modulated by an annual cycle, decaying with time. The annual cycle is mainly associated with several hydrothermal or volcanic regions where short-term triggering was also observed. These data indicate that the Landers earthquake produced long-term physical changes in these areas, and that an environmental source of stress—plausibly barometric pressure—might be responsible for the annual variation.

Date: 2000
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DOI: 10.1038/35020045

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