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The local magnitude scale in the Korean Peninsula

机译：朝鲜半岛的局部震级

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摘要

A formula to determine the local magnitude (M-L) following Richter's original definition was empirically derived for the Korean Peninsula. A total of 1,644 digital seismograms from 142 Korean earthquakes that occurred from 1997 to 2000 were corrected for instrument response and convolved with the nominal Wood-Anderson torsion seismograph response to be appropriate for the original definition of ML. Then, the zero-to-peak amplitude was measured in millimeters on the synthetic Wood-Anderson seismogram. Multiple regression analysis was conducted to determine distance and station correction terms for the measured peak amplitudes. The best-fit solution for ML yielded the following formula for the Korean Peninsula:M-L = log(10) A(Delta)+ 1.12 log(10) Delta + 0.60 - S,where A(Delta) and S denote the peak amplitude on the synthetic Wood-Anderson seismogram at distance D and the station correction term, respectively. Note that the second term, distance correction, was adjusted with Richter's M-L, taking into consideration attenuation differences between the Korean Peninsula and southern California, where Richter originally introduced M-L. On average, the magnitudes determined in this study are nearly the same as those determined by the Korea Institute of Geoscience and Mineral Resources (KIGAM), but are larger than those of the Korea Meteorological Administration (KMA) by as much as 0.36.
机译：对于朝鲜半岛，根据经验推导了按照里氏最初的定义来确定局部强度（M-L）的公式。从1997年到2000年发生的142次韩国地震中，总共对1,644张数字地震图进行了仪器响应校正，并与名义上的Wood-Anderson扭转地震仪响应进行卷积，以适合ML的原始定义。然后，在合成Wood-Anderson地震图中以毫米为单位测量零峰振幅。进行了多元回归分析，以确定测得的峰值幅度的距离和测站校正项。 ML的最佳解决方案得出朝鲜半岛的以下公式：ML = log（10）AΔ（Δ）+ 1.12 log（10）Δ+ 0.60-S，其中A（Δ）和S表示峰值分别在距离D和测站校正项下合成的Wood-Anderson地震图。请注意，第二项距离校正是使用Richter的M-L进行调整的，其中考虑了朝鲜半岛和南加州（Richter最初引入M-L的地方）之间的衰减差异。平均而言，这项研究确定的震级与韩国地质科学与矿产研究所（KIGAM）确定的震级几乎相同，但比韩国气象局（KMA）的震级高0.36倍。

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