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根据中国地震局分析预报中心提供的资料，１９９９年６月份华北地区（３３．０°～４２．０°Ｎ，１１１．０°～１２５．０°Ｅ）共发生ＭＬ≥３．０地震１０次（见表１），无ＭＬ４以上地震发生，２２日１３时４３分发生在牟中的ＭＬ３．８地震是本月最显著的事件，华北西部
According to the data provided by the Center for Analysis and Prediction of China Earthquake Administration, ML ≥ 3.0 earthquakes occurred in North China in June 1999 (33.0 ° ~ 42.0 ° N, 111.0 ° ~ 125.0 ° E) for 10 times (Table 1). No ML4 earthquake occurred. The ML3.8 earthquake that hit Muzhong at 13:43 on the 22nd was the most notable event of the month. The western part of North China