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首页> 美国政府科技报告 >Distribution of Seismicity before Large Strike slip and Thrust-Type Earthquakes.
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Distribution of Seismicity before Large Strike slip and Thrust-Type Earthquakes.

机译：大冲击和推力型地震前的地震活动分布。

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The patterns of seismic activity before large strike slip and thrust-type earthquakes were examined for intervals as great as 45 years before the main shocks. The earthquakes chosen for this investigation occurred along the northwestern, northern, and eastern margins of the Pacific, and most of these events had rupture zones that extended hundreds of kilometers. The observed distribution of prior seismicity for these earthquakes correlates with the configurations of their rupture zones and with the epicentral locations of the main shocks within the zones. An obvious and consistent feature of these spatial distributions is the relatively aseismic character of extensive portions of the rupture zones until the times of the main shocks. These reduced levels of seismic activity extended to events at least several magnitudes smaller. For most of the large earthquake examined, rupture initiated in an area of moderate seismic activity and then propagated as much as hundreds of kilometers into adjacent quiet regions. In at least several instances, rupture also terminated in a region of some prior activity. One important conclusion of this study is that gaps in seismicity for great earthquakes along major plate boundaries may also be gaps for smaller-magnitude activity.

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