1  大关地震区的主要断裂及马边—昭通地震带1900年以来M≥50级地震震中分布图

Fig1  Major faults in Daguan seismic area and epicentral distribution of

        the events

        (M≥50) along Mabian-Zhaotong seismic belt since 1900

        ①马边—奕良断裂;②巧家—莲峰断裂;③洒鱼河断裂;④宜宾断裂