The repetition of large-earthquake ruptures

被引:143
作者
Sieh, K
机构
[1] Seismological Laboratory, Div. of Geol. and Planetary Sciences, California Institute of Technology, Pasadena
关键词
D O I
10.1073/pnas.93.9.3764
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
This survey of well-documented repeated fault rupture confirms that some faults have exhibited a ''characteristic'' behavior during repeated large earthquakes-that is, the magnitude, distribution, and style of slip on the fault has repeated during two or more consecutive events. In two eases faults exhibit slip functions that vary little from earthquake to earthquake. In one other well-documented case, however, fault lengths contrast markedly for two consecutive ruptures, but the amount of offset at individual sites was similar. Adjacent individual patches, 10 km or more in length, failed singly during one event and in tandem during the other. More complex cases of repetition may also represent the Failure of several distinct patches. The faults of the 1992 Landers earthquake provide an instructive example of such complexity. Together, these examples suggest that large earth-quakes commonly result from the failure of one or more patches, each characterized by a slip function that is roughly invariant through consecutive earthquake cycles. The persistence of these slip-patches through two or more large earthquakes indicates that some quasi-invariant physical property controls the pattern and magnitude of slip. These data seem incompatible with theoretical models that produce slip distributions that are highly variable in consecutive large events.
引用
收藏
页码:3764 / 3771
页数:8
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