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Accurate Determination of Local Magnitude for Earthquakes in the Western Canada Sedimentary Basin

机译:加拿大西部地震地震局部级别的准确确定

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In this study, we take a close look at the constituents of the Richter (1935) relation for calculation of local magnitude (M-L), which is the basis for magnitude determination by Natural Resources Canada (NRCan) in the western Canada sedimentary basin (WCSB). Using a comprehensive catalog of Wood-Anderson amplitudes from earthquakes in northeast British Columbia and western Alberta, we first compare the distance correction terms - log(A(0)) for the Richter magnitude scale previously obtained for WCSB and several other regions. We also formulate a new correction term specifically for NRCan's routine M-L calculation that better accounts for the attenuation of direct and refracted waves from events within WCSB. Based on a bilinear model for ground-motion attenuation, our -log(A(0)) is
机译:在这项研究中,我们仔细研究了Richter(1935)的组成部分,以计算局部幅度(ML)的计算,这是加拿大西部西部沉积盆地的自然资源(NRCAN)的幅度决定的基础(WCSB )。 我们首先使用来自东北哥伦比亚和艾伯塔西部的地震的综合目录,我们首先比较了对WCSB和其他几个地区以前获得的Richter幅度规模的距离校正条款 - log(a(0))。 我们还专门为NRCAN的例程M-L计算制定了一个新的修正项,更好地占WCSB内的事件的直接和折射波的衰减。 基于用于地面运动衰减的双线性模型,我们的-Log(a(0))是

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