当前位置：首页 > 过刊浏览->2013年第5\6期合刊
HTML全文
汶川8.0级地震前发震断裂带地震活动特征研究
Seismicity and stress field feature of the seismic fault zone before the M8.0 Wenchuan earthquake
- DOI:
- 作者:
- 魏娅玲 蔡一川 苏金蓉 吴微微
- 作者单位:
- 四川省地震局，成都 610041
- 关键词:
- 汶川地震；龙门山断裂带；分区速度模型；双差定位法
Wenchuan earthquake；Longmenshan fault zone；Partition velocity model；double difference location method
- 摘要:
-
设定两个不同研究领域，分别就汶川8.0级地震前地震活动特征进行研究，得出以下结论：（1）至少在2008年5月11日之前的38年时间中，龙门山断裂带中段出现M5.0级以上地震空段，汶川巨大地震就发生在这一空段；（2）第一研究区域强震释放能量出现阶段性梯次减少现象；（3）至2008年初，估算出第一研究区域地应力积累量已达5.0136×1016J，相当于一次M7.9级强震所能释放的能量；（4）第二研究区域中小地震在龙门山断裂带中段的南端形成了几乎垂直相交的两条地震带，小震活动明显增多。
Set up two different research areas,respectively analysis two area seismicity before the M8.0 Wenchuan earthquake，Draw the following conclusion:（1）At least in the 38 years before on May 11,2008, A More than M5.0 seismic empty section appeared in the midsection of the Longmenshan fault zone,the Wenchuan great earthquake occursed in this empty section；（2）These energy that the strong earthquake released appeared echelon periodic decreasing phenomenon in the first study area；（3）To the beginning of 2008,ground stress accumulation value has amounted to 5.0136×1016J, about a magnitude M7.9 earthquake can release energy；（4）In the southernmost of the midsection of the Longmenshan zone formed two almost vertical two seismic zone in the second study area, small earthquakes clear increase。
