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本文根据长周期地震仪记录的P波资料,研究了通海地震(M_s=7.7)的震源参数和破裂过程。该地震沿着北西西走向的曲江断裂扩展,为非对称的双侧破裂,北西侧为24公里,东南侧为32公里,平均破裂速度为2.3公里/秒;地震矩为4.34×10~(26)达因·厘米,应力降为21巴;地震前后存在无震滑动;余震除沿主破裂面分布外,还大量集中于主破裂面的东南端的扩展分支上,并与主破裂面偏离80°左右。
Based on the P-wave data recorded by the long-period seismometer, the source parameters and the rupture process of the seaward-shaking earthquake (M_s = 7.7) are studied. The quake expands along the northwest-west Qujiang fault, which is an asymmetrical bilateral rupture with a length of 24 km on the north west side and 32 km on the southeast side with an average rupture speed of 2.3 km / s and a seismic moment of 4.34 × 10 ~ (26) dyne · cm, the stress drop is 21 bar; there is an anomalous slip before and after the earthquake; besides the main rupture plane, aftershocks are also concentrated on the extended branch of the southeast end of the main rupture plane and deviated from the main rupture plane 80 ° or so.