New calibration for local magnitude (⁠ML⁠) was performed for Colombia. The territory was divided into five zones using reported attenuation values for different areas of the country and correlating this information with the mapped lithologies, the absence or presence of volcanic activity, and patterns in the hypocentral locations of seismicity. Seismic data from the Colombian National Seismic Network—Colombian Geological Survey (RSNC‐SGC) were used to obtain a total of 81,232 peak amplitudes from 22,816 earthquakes recorded between January 2015 and August 2017. This set of data was incorporated into a linear inversion to calculate the distance‐correction functions for each zone. A new methodology is proposed for calculating the base level of the distance‐correction function or parameter c⁠, using the amplitude values for earthquakes with moment magnitudes (⁠Mw⁠) close to 3 measured at stations at distances close to 100 km. The distance‐correction logA0 functions obtained in this study for the five zones are: Zone 1:−logA0=1.245×log(r)+0.0024×r−2.051,Zone 2:−logA0=1.056×log(r)+0.0021×r−1.76,Zone 3:−logA0=1.07×log(r)+0.0013×r−1.531,Zone 4:−logA0=1.241×log(r)+0.0015×r−2.178,Zone 5:−logA0=0.711×log(r)+0.0009×r−0.69, in which r is the hypocentral distance in kilometers. The results of this study are in use in the RSNC‐SGC since September 2018. Before using the equations presented here, the values of local magnitude were previously underestimated for the entire Colombian territory. This work allows the calculation of the local magnitude using the largest attenuation changes in addition to decreasing discrepancies with other magnitude types such as Mw and those calculated by international networks.

中文翻译：

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哥伦比亚当地震级刻度的校准

对哥伦比亚进行了新的局部震级校准（⁠ML⁠）。使用报告的该国不同地区的衰减值将该领土划分为五个区域，并将该信息与映射的岩性，是否存在火山活动以及地震活动的震中位置相关联。使用哥伦比亚国家地震台网-哥伦比亚地质调查局（RSNC-SGC）的地震数据，从2015年1月至2017年8月记录的22,816次地震中获得了总计81,232个峰值振幅。这组数据被整合到线性反演中以进行计算每个区域的距离校正功能。提出了一种新的方法来计算距离校正函数或参数c⁠的基本水平，使用在距近100 km的站点上测得的矩震级（Mw⁠）接近3的地震的振幅值。在此研究中获得的五个区域的距离校正logA0函数为：区域1：-logA0 = 1.245×log（r）+ 0.0024×r-2.051，区域2：-logA0 = 1.056×log（r）+ 0.0021× r−1.76，区域3：−logA0 = 1.07×log（r）+ 0.0013×r−1.531，区域4：−logA0 = 1.241×log（r）+ 0.0015×r−2.178，区域5：−logA0 = 0.711× log（r）+ 0.0009×r-0.69，其中r是以公里为单位的下摆距离。该研究的结果自2018年9月以来一直在RSNC-SGC中使用。在使用此处给出的等式之前，以前对整个哥伦比亚领土的本地震级值都低估了。