摘要
利用山东测区2009—2015年的流动重力资料,采用绝对重力控制,相对重力联测的经典平差方法,给出了山东测区重力场动态变化图像,系统地分析了2013年11月23日莱州M_S4.6级、2015年5月22日乳山M_S4.6级地震前后重力场的空间变化和段差变化特点,并结合地质构造及机理探讨了重力变化特征与莱州地震、乳山地震之间的关系。结果表明:莱州M_S4.6级地震震区位于重力场差分变化零值线拐弯区域;乳山M_S4.6级地震震区位于重力场差分变化正异常的最大区域。另外,从跨断裂的段差变化可以看出,地震发震前后重力段差必然在断裂带两侧有一次明显的累积上升过程,且幅度较大,一般在转折下降时易发震。
Using the flow gravity observation data in Shandong survey area from 2009 to 2015, the absolute gravity control, relative gravity conjunction of the classical adjustment method, the paper gives the dynamic image of gravity field in Shandong survey area and systematically analyzes the spatial variation of gravitational field and segment difference change characteristics before and after the Laizhou Ms 4.6 earthquake on 23rd November 2013, Rushan Ms 4.6 earthquake on 22nd May, 2015. Combining with the geological structure and earthquake mechanism characteristics analysis, the paper discusses the relation of characteristic of gravity variation and Laizhou earthquake and Rushan earthquake. The results show that Rushan the zone of Laizhou Ms 4.6 earthquake is located at the gravity field variation difference zero line turn are earthquake is located at the area with the maximum positive anomaly of gravity f can be seen from the cross fault segment difference that the earthquake seismic and sides the fracture zone inevitably have a significant cunndative rise process wilh large generally occur in the transition falls. the zone of Rushan Ms 4.6 difference. In addition, it gravity difference on both magnitude and earthquakes
出处
《华南地震》
2016年第4期27-33,共7页
South China Journal of Seismology
基金
地震行业科研专项(201508009-12)
山东地震局合同制项目(15Y116)
关键词
莱州地震
乳山地震
重力变化
地质构造
Laizhou earthquake
Rushan earthquake
Gravitational fiehl variation
Geological structure
