BKP双旋转体系与朝鲜半岛地震活动安全岛效应

朝鲜半岛位于中国东北和日本西南部的地震频发区之间,但在历史资料或仪器记录中,过去百年内没有发生过灾难性的地震。为了说明这一问题,引入了阿穆尔板块(BKP),通过对板块周缘地震进行震源机制解的分析,给定了一个科学合理的边界带,结合GPS相对位移测量,结果显示,BKP内部以郯庐断裂带为界,北部作逆时针旋转,南部朝鲜半岛作顺时针旋转的"双旋转"运动。BKP在旋转过程中,通过郯庐断裂带卸载了大部分的旋转应力。根据古登堡-里克特经验公式计算,在1900~2014年间,沿BKP边界的地震带释放总能量是朝鲜半岛地震的(M≥3.0)10~6倍,说明朝鲜半岛处于一个稳定的"安全岛"状态。通过研究,初探了阿穆尔板块边界的划定和板块边缘及内部构造运动的问题,且从多方面阐明了朝鲜半岛免于灾难性地震的原因。

Double rotation system of BKP and the safety island effect of earthquake activity in the Korean Peninsula

Although the Korean peninsula is located near several great earthquake regions such as NE China and SW Japan,it has never suffered from catastrophic earthquakes for the last 100 years according to historical and instrumentalrecords. In order to explain this problem, Amr plate (BKP) was introduced,Given a reasonable boundary zone the analysis of focal mechanism solutions of plate edge and GPS displacement measurement, results show that the BKP is divided into two parts by Tanlu fault, northern counter-clockwise rotation, Korean Peninsula of Southern BKP clockwise rotation, Witch are Composed of double rotation , unloaded most of the rotation stress through the Tanlu fault. According to the calculation of the Gutenberg Richter formula, in 1900-2014, the total energy released along the earthquake zone of BKP border is 106 times that of the Korean Peninsula, which indicates that the Korean Peninsula is a stable "safety island" state. Through this study, A preliminary study on the delimitation of the Amr plate boundary and the internal tectonic movement, Clarify the cause why Korean peninsula avoid devastating earthquake from many aspects.