虽然有大量的物理现象已被看作是可能的地震前兆,但是这些现象,没有一个能始终如一地用于准确及时的预报。Rikitake(1976)对地震预报作了详细的评述,Dmowska(1977)和 Vogel(1979)也作了进一步的评述。与这些现象有关的参数是地震波速度、磁场、电阻率、孔隙度、导磁率,甚至包括动物行为。在地表见到的这些现象中,最普遍而又引人注目的是震前出现的非地震成因的地壳升降。已经认为,使地球物质产生破裂的震源机 Although a large number of physical phenomena have been considered as possible earthquake precursors, none of these phenomena can consistently be used for accurate and timely forecasts. Rikitake (1976) provided a detailed review of earthquake prediction and further comments by Dmowska (1977) and Vogel (1979). The parameters associated with these phenomena are seismic velocity, magnetic field, resistivity, porosity, permeability and even animal behavior. The most common and striking of these phenomena seen on the earth’s surface are the movements of the earth’s crust, which were caused by non-earthquakes before the earthquake. It has been considered that the Earth’s source produced rupture of the source machine