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收集整理了四川、云南、重庆3省市的数字地震波记录资料,反演该区域的中小地震震源机制解,并利用这些结果采用力轴张量法计算给出5个主要构造带(区)在汶川8.0级地震前后的平均应力场.对比汶川地震前后各主要构造带(区)应力场的状态发现,龙门山构造带南段、鲜水河构造带南段在汶川地震前后局部应力扰动明显,即震后平均应力场方位扰动值相对变化较大;鲜水河构造带南段、龙门山构造带南段和华蓥山构造带中段震后逆倾型地震明显减少.分析认为,这是巨大地震前后大范围地壳应力状态变化或调整的一种反映.  相似文献
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The contrast research results show that the number of items and stations with imminent, short and medium term precursor anomalies for the Wenchuan M_S 8. 0 earthquake is less than that of the Menglian earthquake. The number of anomalies and stations associated with the Wenchuan earthquake increased in the early stage of the short-term range,as opposed to the later period for the Menglian and Lijiang earthquakes. Most of the medium term anomalies occurred two to three years before the Wenchuan earthquake,when the number of anomaly stations and items was eleven,and a great change appeared in the observation values in about half of the stations ( items ) . However,for the Menglian earthquake,medium term anomalies happened one to two years before the earthquake, the number of abnormal stations and items reached 20,and a sharp change appeared in the observation values six months to one year before the earthquake in about 30 percent of the stations or items. In the epicenter and the nearby area,the macroscopic abnormalities started 3 years before the Wenchuan earthquake and lasted intermittently until 1 month before the earthquake. Within 2 percent of the total area of the province,the macroscopic abnormalities accounted for 30 to 50 percent of the total number of anomalies of the Province. For the Xingtai,Tangshan,Haicheng,Songpan earthquakes,the macroscopic anomalies started two to three months before,or on the very day of the earthquakes. The common feature of the precursors between the Wenchuan and other strong earthquakes is the appearance of tremendous changes in a certain number of observation values of anomalies in the mid and short terms before all these earthquakes.  相似文献
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