1923年仁达地震与1973年炉霍地震的破裂模型及触发关系研究

采用1923年仁达MS7.3地震和1973年炉霍MS7.4地震地质考察的同震破裂数据，基于弹性半空间位错模型和最小二乘方法反演历史地震破裂模型。以仁达地震的同震滑动分布为扰动源，采用PSGRN/PSCMP程序计算其在断层面上产生的同震和震后库仑应力变化。结果表明，仁达地震最大滑动量约为3.3 m，矩震级为MW7.0；炉霍地震最大滑动量约为3.7 m，矩震级为MW7.3。2次地震的最大滑动量均位于浅部0~5 km，且震源机制相似，以左旋走滑为主。仁达地震同震及震后效应引起炉霍地震震中区域的库仑应力增强约29.79 kPa，达到地震触发阈值10 kPa。

Study on Rupture Models and Triggering Relationships of the 1923Renda Earthquake and the 1973 Luhuo Earthquake

We use the co-seismic rupture data for geological surveys of the 1923 MS7.3 Renda earthquake and the 1973 MS7.4 Luhuo earthquake to invert the historical earthquake rupture models based on elastic half-space dislocation model and least squares method. The co-seismic slip distribution of the Renda earthquake is considered as the disturbance source, and we calculate the co-seismic and post-seismic Coulomb stress changes on the fault plane using the PSGRN/PSCMP program. The results show that the maximum slip of the Renda earthquake is about 3.3 m, and the moment magnitude of the Renda earthquake is MW7.0. The maximum slip of the Luhuo earthquake is about 3.7 m, and the moment magnitude is MW7.3. The maximum slip of the two earthquakes are located at the shallow of 0~5 km, and the focal mechanisms are similar which are mainly left-lateral strike-slip. The Coulomb stress change at the epicenter of the Luhuo earthquake is about 29.79 kPa due to the co-seismic and post-seismic effect of the Renda earthquake, which reaches the triggering threshold of 10 kPa.