摘要
酒西盆地为河西走廊西段的一个压陷性盆地,其内发育了多条晚第四纪活动逆断裂、褶皱带,是未来具有发生破坏性地震的潜在震源区。通过对酒西盆地和邻近地区9个潜在震源区的长期地震活动水平的对比研究,发现不同震级档的潜在震源区基本处于各自的一个地震活动水平档上。据此将玉门潜在震源区地震活动水平与其它潜在震源区对比,并结合区内活动构造及历史地震等活动特征,判定其震级上限为MS7.0。指出地震活动水平对比方法可作为潜在震源区划分中的一个辅助手段。
Jiuxi basin, a compressional basin in western segment of Hexi Corridor, had developed several late Quaternary reverse faults and fold zones, and is a potential seismic source of strong earthquake in future. In this paper, taking Yumen potential seismic source zone as an example, the long-term seismic activity levels of 9 potential seismic sources near Jiuxi basin are compared. It is found that seismic activities of seismic sources in same magnitude grades are nearly in the same level respectively. Basing on the result, it is feasible that determination of the upper-bound magnitude of Yumen potential source is Ms7. 0. So, comparing seismic activities level in long term is a auxiliary measure for determination of potential seismic source zone.
出处
《西北地震学报》
CSCD
北大核心
2009年第2期136-141,共6页
Northwestern Seismological Journal
基金
国家科技支撑计划项目子专题2006BAC13B01-0102
甘肃省科技攻关基金项目(2GS054-A44-015)
关键词
地震活动水平
酒西盆地
逆断裂-褶皱带
潜在震源区
震级上限
Seismic activity level
Jiuxi basin
Reverse fault-fold zone
Potential seismic source zone
Upper-limit magnitude
