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已往主要以地质及地球物理角度来研究活断层。近来地球化学在这方面的研究亦有所报道(King,1980)。地球内部逸出的Rn,He一类气体成分的异常被认为是地震的可能前兆。这些气体有可能通过活断层,矿泉以及其它通道排出。Sugisaki(1980)把日本中部断层内排出的气体分成二类:(1)主要存在于断层泥内富含H_2和CO_2而贫CH_4;(2)存在于从断层带流出的矿水中,富含He和CH_4,往往缺乏CO_2。1966年塔什干地震后,地下
In the past, the main fault was the study of the active faults in terms of geology and geophysics. Recent studies of geochemistry in this area have also been reported (King, 1980). Abnormalities of gas components such as Rn and He that escape from the Earth’s interior are considered as possible precursors to earthquakes. These gases may be discharged through active faults, mineral springs and other channels. Sugisaki (1980) classifies gases discharged from central Japan faults into two categories: (1) H 2 and CO 2 are predominantly present in fault mud and depleted in CH 4; (2) Gas present in the effluent from the fault zone is enriched with He And CH_4, often lacking in CO2