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Determination of Local Magnitude Distance Corrections for Northern Oklahoma

机译:俄克拉荷马州北部局部幅度距离校正的确定

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摘要

Richter's local magnitude distance correction terms may have a significant bias with respect to distance if applied in a region with attenuation properties different than southern California. Using data from a network of broadband seismometers installed in northern Oklahoma, we empirically constrain the attenuation properties based on the amplitudes of observed seismograms to determine a formula for local magnitude for this region that is unbiased with respect to distance. We use both the classic definition of local magnitude as proposed by Richter and a second method that calibrates local magnitude so that it agrees with moment magnitude where a regional moment tensor can be computed. For both methods, the new formula results in magnitudes systematically lower than the existing local magnitude model used by the Oklahoma Geological Survey. We compare the resulting magnitudes and discuss the benefits and drawbacks of each method. Our results highlight the importance of determining accurate distance correction terms for magnitude computation with regional network data.
机译:如果在具有与南加州不同的衰减特性的区域中应用,Richter的局部幅度距离校正术语可能具有很大的偏差。使用从俄克拉荷马州北部安装在北俄克拉荷马州的宽带地震仪网络的数据,基于观察到的地震图的幅度来验证衰减特性,以确定对相对于距离不偏向的该区域的局部大小的公式。我们使用Richter提出的局部幅度的经典定义和校准局部幅度的第二种方法,使得它同意可以计算区域时刻张量的时刻幅度。对于这两种方法,新的公式会产生大于俄克拉荷马地质调查所使用的现有局部幅度模型的大幅度。我们比较产生的大小并讨论了每种方法的益处和缺点。我们的结果突出了确定具有区域网络数据的幅度计算准确距离校正项的重要性。

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