图14  阴山带(吉兰泰－天镇)地震月频度变化曲线

Fig.14  Variation curve for monthly frequency of earthquakes along

        the Yinshan Earthquake Belt(Jilantai-Tianzhen)

       (北纬39°00′－41°30′, 东经105°00′－108°00′,北纬40°00′－41°30′,

       东经108°00′－115°00′，M_S≥1.0)

       注：磴口、凉城、乌加河和包头震群未计入