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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Crustal stress field in southern California and its implications for fault mechanics
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Crustal stress field in southern California and its implications for fault mechanics

机译：加利福尼亚南部的地壳应力场及其对断层力学的影响

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We present a new, high spatial resolution image of stress orientation in southern California based on the inversion of earthquake focal mechanisms. We use this image to study the mechanics of faulting in the plate boundary region. The stress field contains significant spatial heterogeneity, which in some cases appears to be a result of the complexity of faulting and in other cases appears to be a cause. Temporal changes in the stress field are also observed, primarily related to major earthquakes. The observed 15 degrees (+/- 10 degrees) rotation of the stress axes due to the 1992 M7.3 Landers mainshock implies that the deviatoric stress magnitude in the crust is low, of the order of 10 MPa. This suggests that active faults in southern California are weak. The maximum principal stress axis near the San Andreas Fault is often at similar to 50 degrees to the fault strike, indicating that the shear stress on the fault is comparable to the deviatoric stress. The San Andreas in southern California may therefore be a weak fault in a low-strength crust. [References: 65]
机译：我们基于地震震源机制的反演，提出了加利福尼亚南部应力定向的新的高分辨率空间分辨率图像。我们使用该图像来研究板块边界区域的断层力学。应力场具有明显的空间异质性，在某些情况下，这似乎是断层复杂性的结果，而在其他情况下，则是原因。还观察到应力场的时间变化，主要与大地震有关。由于1992 M7.3 Landers主冲击，应力轴旋转了15度（+/- 10度），这表明地壳中的偏应力强度很低，约为10 MPa。这表明加利福尼亚南部的活动断层很弱。 San Andreas断层附近的最大主应力轴通常与断层走向近似50度，这表明断层上的剪切应力与偏应力相当。因此，加利福尼亚南部的圣安德烈亚斯可能是低强度地壳中的弱断层。 [参考：65]

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