基于有限元分析的松原震群与日本大地震的关系探讨

Discussion on Relationship between Songyuan Swarm and Japan Huge Earthquake Based on Finite Element

日本3·11大地震之后,我国松原地区发生了多次4级以上地震,两者之间存在的关系是本文探讨的重点。利用有限元方法,构造两个有限元模型,从库仑应力变化的角度研究日本3·11大地震对位于郯庐断裂带北段第二松花江断裂的影响。模拟结果表明,日本大地震对我国东北部地区影响大,第二松花江断裂带的位移最大达到20 mm。整个研究区的静态库仑应力均为正值,表明该断层处于危险阶段。考虑到实际地壳介质对应变传递的延迟效应,日本3·11大地震对我国东北地区的实际影响会有一个滞后,因此松原震群与日本3·11大地震存在密切相关性。

After Japan 3 · 11 earthquake, it happened many times earthquakes of at least magnitude 5 in Songyuan area of China. In the paper, relationship between Songyuan swarm and Japan huge earthquake is the key. According to the finite element models, the impact of Japan earthquake to the second Songhua river fault, located on the north section of Tan - lu fault zone is discussed in view of displacement field and coulomb stress. The simulation results show that Japan earthquake has notable impact on Northeast China, and the maximize displacement value located in the second Songhua river fault reaches to 20 millimeters. In Songyuan area, static coulomb stress is positive, it illustrates that the fault is in the state of danger. Considering of the actual delay effect of crustal medium to stress transfer, the impact of Japan 3.11 earthquake on the Tan - lu fault zone will have a delay, so the follow - up effect will stay for a cer- tain time. This will be taken more attention by all of us.