Seismic Slip Distribution along the San Jacinto Fault Zone, Southern California, and Its Implications
Seismic Slip Distribution along the San Jacinto Fault Zone, Southern California, and Its Implications
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南加州圣哈辛托断裂带地震滑移分布及其意义
DOI：
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发表时间：
1975
期刊：
影响因子：
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通讯作者：
T. Hanks
中科院分区：
文献类型：
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作者：
W. Thatcher;J. Hileman;T. Hanks
根据1890年以来发生的9次中强地震(6&7级)中每一次的地震矩测定和震源规模估计，得到了圣哈辛托断裂带卡洪山口至迷信山间240公里处的地震滑动量及其分布。
地震滑动有两个显著的缺口，一个是在卡洪山口和河滨之间，另一个是从安扎到郊狼山。它们长约40公里，都以复杂的断裂带和目前较高水平的小震活动为特征(M<；5)。在任何一段上都没有发现无地震的断层蠕变。这些空白可能标志着下一次中强震(M=6→7)将沿着圣哈辛托断裂带发生的地点。断层的两个剩余部分，河滨和安扎，以及郊狼山到迷信山，可能分别在1890-1923年和1942-1968年间沿其全长破裂。
The amount and distribution of seismic slip along 240 km of the San Jacinto fault zone between Cajon Pass and Superstition Mountain has been obtained from determinations of seismic moment and estimates of source dimension for each of the nine moderate earthquakes (6 < M < 7) which have occurred there since 1890.
There are two significant gaps in seismic slip, one between Cajon Pass and Riverside, the other from Anza to Coyote Mountain. Each is about 40 km long and both are characterized by complex fault zones and a currently high level of minor seismicity (M < 5). No aseismic fault creep has been identified on either segment. These gaps may mark the sites of the next moderate earthquakes (M = 6 → 7) to occur along the San Jacinto fault zone. The two remaining sections of the fault, Riverside and Anza, and Coyote Mountain to Superstition Mountain, may have been ruptured along their entire lengths, in 1890–1923 and 1942–1968, respectively.