后两种来源局限于少数区域，在这些区域，地表水通过地下断层或断裂往下渗透，从而接触到被近期的熔岩活动加热的深层岩石。
The latter two sources are limited to those few areas where surface water seeps down through underground faults or fractures to reach deep rocks heated by the recent activity of molten rock material.
SDO是在二月份发射升空的，它的主要功能是深层次观测太阳内层现象从而对神秘的太阳内部活动进行调查研究。
SDO was launched in February and peers deep into the layers of the sun, investigating the mysteries of its inner workings.
有团队研究出深层式慢性地震和浅层式慢性地震的发生是串联方式的，意思是深层和浅层的活动是相关的，也有可能就是一个引起了另一个的震动。
Deep and shallow earthquakes measured by the team occurred in tandem, indicating that the deeper and shallower motions are linked, perhaps with one set triggering the other.
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