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南加州地震震源深度的分布表明,具有片岩基底的地区较具有其他类型基底岩石地区的最大震源深度浅(其深度在4～10km)。与其他基底岩石的矿物相比,片岩中的主要矿物塑化所需的温度较低,因而在深度较浅处塑化。岩性的水平向变化将控制未来潜在地震震源深度范围(乃至震级)。这种深度范围可以通过目前的背景地震活动性的深度来确定。
The distribution of focal depths of the Southern California earthquake shows that the area with schist bases is shallower than the depth of the largest focal depths of other types of basement rocks (with depths of 4 to 10 km). Compared to other basement rock minerals, the main mineral in the schist is required to be plasticized at a lower temperature and therefore at a lower depth. The horizontal variation of lithology will control the range (or even magnitude) of potential seismic focal depths in the future. This depth range can be determined by the depth of the current background seismicity.