【摘要】 本文根据陕西测震台网地震目录和地震观测报告等资料,利用基于G-R关系基础上的EMR法,对1970年以来陕西区域地震目录最小完整性震级Mc的时空展布进行了研究。结果表明:模拟观测阶段(1970—2001年9月),ML2.1级以上地震基本完整;在地震台站数字化阶段(2001年10月—2013年4月),最小完整性震级为ML1.6。从时间尺度上看,陕西地区的地震监测能力在逐步提高。同时还分析研究了陕西地区最小完整性震级的空间分布情况,结果表明陕西北部地区Mc无法计算(缺震),中部较南部偏低。更多还原

【Abstract】 This article analyzed the earthquake catalogues and monitoring reports of Shaanxi region since 1970, and reaches the conclusion that earthquake above ML2.1 are basically complete during the analog monitoring stage(1970—Sep.2001) and the minimum magnitude of completeness is ML1.6 during the digitalized seismotation stage(Oct.2001—Apr.2013) using Entire-Magnitude Range(EMR) method based on G-R relation. Considering from time scale, the monitoring ability of Shaanxi region keeps improving over time. We also studied the spatial distribution of the minimum magnitude of completeness of Shaanxi region, it turns out that the Mc of Northern Shaanxi can’t be calculated(for lacking earthquake) and Mc of central Shaanxi is lower than that of Southern Shaanxi.更多还原