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.
讨论了华北平原周边1975年海城地震、1937年荷泽地震及1830年磁县地震3次强震的地表地震破裂特征以及这3个地区北西向断裂的全新世活动。
The characteristics of the surface fractures of 1975 Haicheng earthquake, 1937 Heze earthquake, 1830 Cixian earthquake and activity of Holocene faults in those areas have been discussed in this paper.
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