1992年以来，永夏矿区各矿井相继进行了采区高分辨地震勘探。
Since 1992, the highresolution seismic explorations of working areas have been conducted successively in various mine shafts of Yongxia mining district.
1992年以来，永夏矿区各矿井相继进行了采区高分辨地震勘探。
Since 1992, the highresolution seismic explorations of working areas have been conducted successively in various mine shafts of Yongxia mining district.
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