THE 1960 CHILEAN EARTHQUAKES
THE 1960 CHILEAN EARTHQUAKES
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DOI：
10.1029/jb094ib01p00665
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发表时间：
1989-01-10
期刊：
影响因子：
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通讯作者：
CIFUENTES, IL
中科院分区：
文献类型：
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作者：
CIFUENTES, IL
在1960年智利大地震之前，发生了一个不寻常的前震序列，它始于一个矩为2.0 × 1021 N m、破裂长度约为150 km的地震。地震序列的重新定位显示了地震活动向主震开始的进展。根据余震和地壳形变的分布，估计1960年智利大地震的破裂长度为920 ± 100 km。确定了一个前震和两个余震的震源机制解，并用于约束主震的震源机制解。地震序列中的第一次地震使位于南纬37.03°和38.74°之间的秘鲁-智利海沟破裂，而1960年智利的大主震则使南部相邻的海沟破裂。1960年智利大主震在第一次地震的破裂区域内开始，并在智利海脊与秘鲁-智利海沟（46.5°S）的交叉点附近终止。
An unusual foreshock sequence that began with an earthquake of moment 2.0 × 1021N m and rupture length of about 150 km preceded the great 1960 Chilean earthquake. Earthquake relocations of the sequence show a progression of seismic activity toward the initiation of the main shock. The rupture length of the great 1960 Chilean earthquake is estimated from the distribution of aftershocks and crustal deformation to be 920 ± 100 km. The source mechanisms of a foreshock and two aftershocks are determined and used to constrain the source mechanism of the main shock. The first event in the sequence ruptured the segment of the Peru‐Chile Trench between 37.03°S and 38.74°S, whereas the great 1960 Chilean main shock ruptured the adjoining segment to the south. The great 1960 Chilean main shock initiated within the rupture area of the first event and terminated near the intersection of the Chile Ridge with the Peru‐Chile Trench (46.5°S).