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现今人们估算震级主要还是利用体波和面波振幅。从这角度看震级还只是反映某种频率范围内地震波的能量。现广泛使用的近震震级公式M_L=lgA_μ+R(△),A_μ为二水平分量最大地动位移算术平均值,R(△)为起算函算,即考虑振幅随距离变化对震级的补偿。目前近震震级测定工作上存在的问题原因很多,如仪器类型,放大倍数测量误差、台基影
Nowadays, it is estimated that the magnitude mainly uses the amplitude of body wave and surface wave. From this perspective, the magnitudes reflect only the energy of the seismic waves in a certain frequency range. The near-Earthquake magnitude formula M_L = lgA_μ + R (△) which is widely used nowadays, A_μ is the arithmetic mean of the maximum dynamic displacement of the two horizontal components, and R (△) is the initial calculation function, that is, the amplitude compensation is taken into account when the amplitude varies with the distance. At present, there are many problems existing in the quasi-earthquake magnitude determination, such as instrument type, magnification measurement error,