磐石—伊通地区地震活动性与断裂构造的相关性研究
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摘要
对磐石—伊通地区的地震活动性进行了研究,对研究区的断裂构造、区域重力场特征进行了分析,探讨了地震活动性与断裂构造的空间相关性,分析研究表明:该区域断裂构造比较发育,其展布方向主要有北东、北西向,这几组方向的断裂控制了该区域的地震活动。地震多发生在这些断裂及其交汇处。发现不同震级地震与断裂构造存在一定的相关性,地震大多发生在断裂的上盘。地震活动性分析表明,地震震源层在7~19km位置,该区域以年平均能量释放速率相同,表明该区域的断裂活动可能以蠕滑方式为主,未来发生强震的可能性较低,但却是中小地震活动性较高的地区。随着断裂活动时代变新,断裂周围地震发生的频率也升高,断裂对地震的影响优势距离在10～20km。
In this paper,the seismicity of Panshi-Yitong region was discussed.The faults and regional gravitational field characteristic and the spatial correlation between the seismicity and the faults in this region were analyzed.This study shows that the faults are well developed in the region,and their main distribution direction are NE and NW,which have controlled the regional seismic activity.Most earthquakes are occurred in these faults and the junction among them.Some correlation have been found among different magnitude earthquakes and faults.And most earthquakes occurred in the hanging wall of the fault.The seismicity analysis shows that the seismic source is 7~19km up to the ground.The region has the same average annual energy release rate,which shows that the faults of this region has mainly in creep slip.In the future,the probability of strong earthquake is low,but there would be more higher medium-small earthquake activities.Along with the faulting ages becoming younger,the earthquake frequency will rise around these faults,and the advantage distance is between 10 km to 20 km.
In this paper,the seismicity of Panshi-Yitong region was discussed.The faults and regional gravitational field characteristic and the spatial correlation between the seismicity and the faults in this region were analyzed.This study shows that the faults are well developed in the region,and their main distribution direction are NE and NW,which have controlled the regional seismic activity.Most earthquakes are occurred in these faults and the junction among them.Some correlation have been found among different magnitude earthquakes and faults.And most earthquakes occurred in the hanging wall of the fault.The seismicity analysis shows that the seismic source is 7~19km up to the ground.The region has the same average annual energy release rate,which shows that the faults of this region has mainly in creep slip.In the future,the probability of strong earthquake is low,but there would be more higher medium-small earthquake activities.Along with the faulting ages becoming younger,the earthquake frequency will rise around these faults,and the advantage distance is between 10 km to 20 km.
引文
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[4]樊耀新.思普地区地震活动和地质构造的相关性研究[J].地震研究,1998,21(1):65-69.
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