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首页> 外文期刊>Seismological research letters >Body-Wave Magnitude mb Is a Good Proxy of Moment Magnitude M_w for Small Earthquakes (m_b<4:5 C5:0)
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Body-Wave Magnitude mb Is a Good Proxy of Moment Magnitude M_w for Small Earthquakes (m_b<4:5 C5:0)

机译:波动幅度mb是小地震(m_b <4:5 C5:0)的矩幅度M_w的良好代理

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摘要

Body-wave magnitude m_b is usually considered a poor proxy of moment magnitude M_w because it saturates for moderate and large earthquakes (M_w >5:5–6) and generally shows a poor correlation with M_w. On the other hand, the observed distribution of data at the global scale also seems to indicate an inverse saturation at low magnitudes (M_w <4:5–5:0) in which M_w appears to be almost uncorrelated with mb. We show here that the latter is an artifact of the incompleteness of the global M_w datasets forM_w <4:5–5:0 and that disappears considering lower M_w estimates available from regional centroid moment tensor (CMT) catalogs and/or using general orthogonal regression methods. In these cases we show that m_b well corresponds to M_w <4:5–5:0 and hence can confidently be used for approximating the M_w of small earthquakes.
机译:体波震级m_b通常被认为是矩震级M_w的较差代理,因为它在中等和大地震中饱和(M_w> 5:5-6),并且通常显示与M_w的相关性较差。另一方面,在全球范围内观察到的数据分布也似乎表明在低幅度(M_w <4:5-5:0:0)下的反饱和度,其中M_w与mb几乎不相关。我们在这里显示,后者是M_w <4:5-5:0的全局M_w数据集不完整的产物,考虑到区域质心矩张量(CMT)目录中可用的较低M_w估计值和/或使用一般正交回归,后者消失了方法。在这些情况下,我们表明m_b井与M_w <4:5-5:0相对应,因此可以放心地用于近似小地震的M_w。

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