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一概述测量地球磁场的变化是地震预报的一种手段。地球磁场简称地磁,包括三个要素:磁场强度、磁倾角(地磁磁针与水平面的夹角)和磁偏角(地磁磁针与南北方向的夹角)。地壳中的岩石有许多是有磁性的,这些岩石受力变形时,磁性就会变化。因此在强烈地震前,磁场强度与磁偏角也会发生变化,引起地磁的局部异常。这种因地震活动而导致地磁发生异常变化的现象就叫做“震磁效应”。很多地震活动与地磁异常有关。从空间分布看,有些强震与大地地磁
An overview of the changes in the Earth’s magnetic field is a measure of earthquake prediction. Earth’s magnetic field referred to as geomagnetism, including three elements: the magnetic field strength, magnetic inclination (geomagnetic needle with the horizontal plane angle) and magnetic declination (geomagnetic needle and north-south angle). Many of the rocks in the earth’s crust are magnetic, and the magnetic properties change as the rocks are deformed by force. Therefore, before a strong earthquake, the magnetic field strength and magnetic declination will also change, causing local geomagnetic anomalies. This phenomenon caused by the seismic activity of the Earth’s anomalous change is called “seismic magnetic effect.” Many earthquakes are related to geomagnetic anomalies. From the spatial distribution of view, some strong earthquakes and earth magnetism