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通过建立的2个有限元模型,从位移场的角度探究了日本3·11大地震对郯庐断裂带(中南段)区域的影响。结果表明,日本3·11大地震所引起的同震水平位移在郯庐断裂带附近达到了mm至cm级。在郯庐断裂带的东侧,位移值最大处的中国东北地区达到了30mm,在华北地区,位移值最大处的烟台、威海等地也达到了12mm;在郯庐断裂带的西侧,位移值最大的东北地区有20mm,而在华北地区,位移值最大只有8mm。可见郯庐断裂带的东西两侧位移值差别非常明显。总体而言,日本3·11大地震对中国影响比较大的地方主要在郯庐断裂带的北段,即中国东北地区。考虑到实际地壳介质对应变传递的延迟效应,日本3·11大地震对中国郯庐断裂带的实际影响会有1个滞后,因此,2011年以来辽宁、吉林的多次地震与日本3·11大地震可能存在一定的相关性,可见日本大地震对山东、江苏段的影响仍然不可忽视。
Through the two finite element models established, the impact of the 3.11 earthquake in Japan on the Tanlu fault zone (middle-south section) was explored from the perspective of displacement field. The results show that the horizontal coseismic displacements caused by the 3.11 earthquake in Japan have reached the level of mm to cm near the Tan-Lu fault zone. On the east side of the Tan-Lu fault zone, the northeast China reaches a maximum displacement of 30 mm. In northern China, Yantai and Weihai with the maximum displacement reach 12 mm. On the west side of the Tan-Lu fault zone, The value of the northeast region has 20mm, while in North China, the displacement of the largest only 8mm. Visible Tan-Lu fault on both sides of the displacement value is very obvious. Overall, the major impact of the 3.1-magnitude earthquake in Japan on China was mainly in the northern section of the Tan-Lu fault belt, northeast China. Considering the delaying effect of the actual crustal medium on strain transfer, the actual impact of the 3.1-magnitude earthquake in Japan on the Tan-Lu fault zone in China would have lagged behind. Therefore, since 2011, many earthquakes in Liaoning and Jilin have been compared with Japan’s 3.11 There may be some correlation between the major earthquakes, showing that the impact of the Great Japan Earthquake on Shandong and Jiangsu sections can not be ignored.