日本9.0级地震前后华北形变场变化特征与地震趋势分析

Changing Characteristics of the Deformation Field before and after the 2011 Japan 9.0 Earthquake and Earthquake Trend in Huabei,China

本文分析了华北主要断裂带基于2011年日本9.0级地震同震位移场的应变变化,结合华北地区近几年形变异常分析日本9.0级地震前后华北地区形变场的变化特征,分析了日本9.0级地震对华北地区的影响以及未来值得关注的地区。日本9.0级地震的发生使得华北地区EW向主压应变有所释放,不同地区的同震响应存在差异,部分趋势性变化在日本9.0级地震后有所恢复,目前郯庐带中南段及附近区域的挤压应变背景和断层活动水平增强值得关注。

Strain changes of the main faults in Huabei region co-deformed from the 2011 Ja- pan 9.0 earthquake are analysed in this paper. Combined with recently deformation anom- alies analysed the characteristics of deformation change of the Huabei region before and af- ter Japan 9.0 earthquake, discussed the impact on the earthquake trend in Huabei region and other future concern areas. The results show that EW compressive strain of Huabei region were partly released during Japan 9.0 earthquake, and co-deformation responses differed in different regions. Some deformation trends have turned back after the earth- quake. Recent phenomenon near the middle-south segment of the Tanlu Fault should be of concern, where compressive deformation background and fault activity level have in- creased.