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

被引:52
作者
Gao, SS [1 ]
Silver, PG [1 ]
Linde, AT [1 ]
Sacks, IS [1 ]
机构
[1] Carnegie Inst Washington, Dept Terr Magnetism, Washington, DC 20015 USA
关键词
D O I
10.1038/35020045
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
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 States(1). 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.
引用
收藏
页码:500 / 504
页数:5
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