根据陕甘宁交界区域测震台网中心提供的地震目录及部分台网资料，利用基于G-R关系的EMR方法，对1970年以来该区域地震目录最小完整性震级Mc的时空分布进行分析。结果显示：自1970年以来，该区域最小完整性震级Mc逐步下降，模拟、"九五""十五"阶段Mc分别为ML 2.3、ML 2.2、ML 1.6，2015年以来Mc维持在ML 1.3左右；"十五"数字化改造后，Mc空间分布呈现不均匀性，但整体低于ML 1.8。
In this article, we have analyzed the minimum complete magnitude of earthquake with spatial and temporal distribution in the border area of Shaanxi, Gansu and Ningxia area base on EMR method from 1970. The data of earthquake catalogue and station network come from region station network. The results show that minimum complete magnitude of earthquake catalog has gradually declined. It was ML 2.3, ML 2.2 and ML 1.6 in analogous, in the ninth five-year plan and the tenth five-year plan stage, respectively from 1970, and has kept at ML 1.3 since 2015. It appears spatial and temporal distribution inhomogeneity. The entirety of minimum complete magnitude of earthquake catalog is inferior to ML 1.8.
2018,39(4): 18-24 收稿日期：2017-11-27
DOI：10.3969/j.issn.1003-3246.2018.04.003
基金项目：2018年度启航与创新基金——鄂尔多斯西缘不同区域最小完整性震级研究（项目编号：QC201820）
作者简介：冯亮亮(1982-),男,硕士研究生,陕西宝鸡人,工程师,主要从事地震活动性分析与监测预报工作。E-mail:fll-0919@163.com
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