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Calibration of Local Magnitude ML in the Azores Archipelago Based on Recent Digital Recordings

机译:基于最新数字记录的亚速尔群岛局部震级ML 的标定

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—The development of the digital seismic network in the Azores Archipelago during recent years made it possible to obtain the amplitudes (waveform) of recorded motion in a large set of stations. With this new data, maximum amplitudes of the Wood Anderson seismograph are computed, for each station/component, which, together with epicentral distances, allows for the estimation of local magnitude M L . We used data recorded in 8 digital permanent three-component stations, with inter-station’s distances up to 300 km, in the period June 1998 – June 2000, corresponding to a set of 1315 events with magnitude (M L or M D ) 2, as well as to determine the corrections to be applied to each station. The new set of parameters, formed by attenuation coefficients and station corrections, were introduced in the calculations of the M L , leading to smaller dispersions in the analyzed dataset. We also conclude that the attenuation in the first 150 km is similar to the California values, although higher for longer distances.
机译:-近年来,亚速尔群岛的数字地震网络的发展使得有可能获得大量台站中记录的运动的振幅(波形)。利用这些新数据,可以为每个测站/组件计算伍德安德森地震仪的最大振幅,再加上震中距离,可以估算出局部震级M L 。在1998年6月至2000年6月期间,我们使用了8个数字永久三分量站中记录的数据,这些站之间的距离最大为300 km,对应于一系列1315个大小(ML 或MD < / sub>)2 ,并确定要应用于每个站的校正量。由M L 的计算引入了由衰减系数和测站校正形成的新参数集,从而导致分析数据集中的色散较小。我们还得出结论,前150 km的衰减与加利福尼亚州的值相似,尽管对于更长的距离而言衰减更大。

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