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地震仪记录中,由于记录笔机械限幅的影响,很多地震因为出格而不能很快定出震级,为解决这一问题,我们收集了一些出格地震图例,总结出了太原台的震级限幅公式.一、基本思路近震体波震级公式为:M_L=logAμ十 R(△)式中Aμ是两水平向地动位移的算术平均值即Aμ=(y_N/V_N+Y_E/V_E)/2R(△)为零级地震的起算函数.由公式看出,震级M_L与最大振幅有关,一般来说,振幅的极大值就代表了地震的大部分能量.在放大倍率相同的情况下记录地震的振幅愈大,震级也愈大.同样,如果记录的最大振幅限幅的时间愈长,震级也就相对的加大,据此,可由地震的限幅长度推算震级.至于R(△),因我们取一定范围的限幅地震,且在限幅时间内包含了它的部分意义,故可不做主要考虑而直接由限幅长度L求得震级.
In seismograph records, because of the mechanical limiter of the stylus, many earthquakes can not determine the magnitude quickly because of the exception. In order to solve this problem, we collected some special earthquakes and summed up the magnitude limit formula of Taiyuan Station First, the basic idea The magnitude of near-Earth body wave magnitude is: M_L = logAμ ten R (△) where Aμ is the arithmetic mean of two horizontal ground motions, ie Aμ = (y_N / V_N + Y_E / V_E) / 2R △) is the initial function of a zero-magnitude earthquake.It can be seen from the formula that the magnitude M_L is related to the maximum amplitude, and in general, the maximum value of the amplitude represents most of the energy of the earthquake.Seismicity is recorded under the same magnification Similarly, if the maximum amplitude of the recorded amplitude is longer, the magnitude will be relatively larger, so that the magnitude can be deduced from the amplitude of the seismic cut. As for R (Δ), due to We take a range of amplitude-limited earthquakes and include some of its significance in the clipping time, so we can derive the magnitude directly from the clipping length L without any major consideration.