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本文利用自适应量子遗传算法对山东胶东半岛乳山地区2013年10月至2015年9月年发生的1357次显著震群活动进行了重定位研究.自适应量子遗传算法具有效率高、搜索能力强等优点,利用自适应量子遗传算法进行地震重定位后大大改善了原地震定位的精度,研究结果表明均方根残差由重定位前的0.40 s减小到重定位后的0.22 s.重定位后的地震震中更集中,条带状更为清晰,总体呈NW向分布.震源深度主要集中在2~16 km范围内的中上地壳,占地震总数的95.8%.乳山震群的最大震源深度为23 km,推测该区地震活动的下界为23km,与华北地区脆韧性转化带相一致.综合乳山震群精定位结果、震群ML3.0级以上地震的震源机制解与区域构造特征,推测其发震构造为NW向近直立隐伏断层.
In this paper, we use adaptive quantum genetic algorithm to relocate 1357 significant swarm events occurring in Rushan area of Shandong Peninsula from October 2013 to September 2015. Adaptive quantum genetic algorithm (GA) has high efficiency and strong search ability The results show that the root mean square error decreases from 0.40 s before relocation to 0.22 s after relocation, and after relocation, the accuracy of the original seismogram is greatly improved by the adaptive quantum genetic algorithm. Of the earthquakes are more concentrated and the bands are more clear and distributed in an NW direction.The depth of the focal depth mainly lies in the middle and upper crust in the range of 2 ~ 16 km, accounting for 95.8% of the total number of earthquakes.The maximum depth of source of the Rushan earthquake swarm is 23 km, suggesting that the lower limit of seismic activity in this area is 23 km, consistent with the brittle-ductile transformation zone in North China.According to the precise positioning results of Rushan earthquake swarm and the focal mechanism solutions and regional tectonic features of the ML3.0 earthquake above the earthquake group, Seismogenic structure NW upright near buried fault.