MODEL FOR EARTHQUAKE SWARMS
MODEL FOR EARTHQUAKE SWARMS
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DOI：
10.1029/jb082i008p01347
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发表时间：
1977-01-01
影响因子：
--
通讯作者：
HILL, DP
中科院分区：
文献类型：
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作者：
HILL, DP
火山区地震群模型由以下概念组成：（1）地壳脆性体积内存在岩浆填充岩脉群，（2）岩脉群内的岩脉系统地定向，其长尺寸沿区域最大主应力方向，（3）沿着以斜角连接梯形偏移岩脉尖端的共轭断层面系统发生一系列剪切破坏（地震群）。该模型解释了各种情况下地表断层模式、群地震震源分布和断层面解之间常见的几何关系。然而，以走滑断层为主的群区域提供了该模型实用性的最引人注目的例子。这里考虑的具体例子包括夏威夷基拉韦厄火山东裂谷带的一个群，以及加利福尼亚州帝王谷和冰岛雷克雅内斯半岛的群，它们代表了扩张中心和转换断层之间的过渡带。
A model for earthquake swarms in volcanic regions consists of the following concepts: (1) clusters of magma‐filled dikes exist within brittle volumes of the crust, (2) dikes within a cluster are systematically oriented with their long dimension in the direction of the regional greatest principal stress, and (3) a sequence of shear failures (an earthquake swarm) occurs along a system of conjugate fault planes joining en echelon offset dike tips at oblique angles. This model accounts for commonly observed geometric relations between surface faulting patterns, the hypocentral distribution of swarm earthquakes, and fault plane solutions in a variety of situations. Swarm areas dominated by strike‐slip faulting, however, provide the most compelling examples of the utility of the model. Specific examples considered here include a swarm on the east rift zone of Kilauea volcano, Hawaii, and swarms in the Imperial Valley, California, and the Reykjanes Peninsula, Iceland, which represent transitional zones between spreading centers and transform faults.