1研究背景。震群是地震活动的一种形式,它的发生和发展与地下物质运动、应力状态、局部地区的构造条件和介质特性均相关(朱传镇等,1981)。受到外部作用后,断层应力增加或发震断层强度降低易导致震群的发生(Shelly et al,2016),其形成可...1研究背景。震群是地震活动的一种形式,它的发生和发展与地下物质运动、应力状态、局部地区的构造条件和介质特性均相关(朱传镇等,1981)。受到外部作用后,断层应力增加或发震断层强度降低易导致震群的发生(Shelly et al,2016),其形成可能受到了大范围构造应力的制约。一些大震来临之前,在相当广阔的区域内,常出现异常的震群活动(朱传镇等,1981;林邦慧等,1994;宋治平等,2001;李冬梅等,2011)。展开更多
针对粒子群优化算法易早熟收敛、求解精度低等缺点,提出基于进化能力的多策略粒子群优化算法(multistrategy particle swarm optimization algorithm based on evolution ability)。将粒子按照适应值变化方向分为进步粒子和停退粒子。...针对粒子群优化算法易早熟收敛、求解精度低等缺点,提出基于进化能力的多策略粒子群优化算法(multistrategy particle swarm optimization algorithm based on evolution ability)。将粒子按照适应值变化方向分为进步粒子和停退粒子。对于进步粒子按照原始进化策略更新,保留原算法的优点。对于停退粒子进一步根据粒子活性分为暂时停退粒子和长久停退粒子,针对暂时停退的粒子,减小对个体历史速度的依赖甚至向相反方向学习,针对长久停退粒子,根据粒子的适应值优劣采用不同的进化策略,提高全局寻优能力。同时,设计一种带随机波动的惯性权重,使粒子在算法后期仍然具有跳出当前区域的能力,利于全局搜索。通过与其他算法在10个测试函数不同维度上的优化结果对比表明,该算法无论对低维还是高维问题求解的收敛速度和求解精度均有优势。将EAMSPSO算法应用于半无限规划问题的求解,实验结果表明,该算法可以用于半无限规划问题的求解,且具有优势。展开更多
There was an earthquake swarm of two major events of MS6.3 and MS5.8 on the Xianshuihe fault in November, 2014. The two major earthquakes are both strike-slip events with aftershock zone along NW direction.We have ana...There was an earthquake swarm of two major events of MS6.3 and MS5.8 on the Xianshuihe fault in November, 2014. The two major earthquakes are both strike-slip events with aftershock zone along NW direction.We have analyzed the characteristics of this earthquake sequence. The b value and the h value show the significant variations in different periods before and after the MS5.8earthquake. Based on the data of historical earthquakes, we also illustrated the moderate-strong seismic activity on the Xianshuihe fault. The Kangding earthquake swarm manifests the seismic activity on Xianshuihe fault may be in the late seismic active period. The occurrence of the Kangding earthquake may be an adjustment of the strong earthquakes on the Xianshuihe fault. The Coulomb failure stress changes caused by the historical earthquakes were also given in this article. The results indicate that the earthquake swarm was encouraged by the historical earthquakes since1893, especially by the MS7.5 Kangding earthquake in1955. The Coulomb failure stress changes also shows the subsequent MS5.8 earthquake was triggered by the MS6.3earthquake.展开更多
现实中存在许多人为制造或自然形成的微地形,以其为单位的应变分布与其所在板块的整体应变分布具有差异,本研究选取地壳活动相对活跃的腾冲市和顺镇区域作为试验区,实验表明已有的整体旋转与线性应变模型(Rotation in the Entire Block ...现实中存在许多人为制造或自然形成的微地形,以其为单位的应变分布与其所在板块的整体应变分布具有差异,本研究选取地壳活动相对活跃的腾冲市和顺镇区域作为试验区,实验表明已有的整体旋转与线性应变模型(Rotation in the Entire Block and Linear Strain Mode,RELSM)在描述板块内部局部微地形应变时表现不佳;为精细刻画板内应变,在已有的RELSM模型基础上,通过引入地形因素,并联合GNSS、InSAR数据,通过改进型粒子群算法反演板内局部区域应变场参数,为局部区域精细化的地壳活动性评估提供帮助.展开更多
文摘1研究背景。震群是地震活动的一种形式,它的发生和发展与地下物质运动、应力状态、局部地区的构造条件和介质特性均相关(朱传镇等,1981)。受到外部作用后,断层应力增加或发震断层强度降低易导致震群的发生(Shelly et al,2016),其形成可能受到了大范围构造应力的制约。一些大震来临之前,在相当广阔的区域内,常出现异常的震群活动(朱传镇等,1981;林邦慧等,1994;宋治平等,2001;李冬梅等,2011)。
文摘针对粒子群优化算法易早熟收敛、求解精度低等缺点,提出基于进化能力的多策略粒子群优化算法(multistrategy particle swarm optimization algorithm based on evolution ability)。将粒子按照适应值变化方向分为进步粒子和停退粒子。对于进步粒子按照原始进化策略更新,保留原算法的优点。对于停退粒子进一步根据粒子活性分为暂时停退粒子和长久停退粒子,针对暂时停退的粒子,减小对个体历史速度的依赖甚至向相反方向学习,针对长久停退粒子,根据粒子的适应值优劣采用不同的进化策略,提高全局寻优能力。同时,设计一种带随机波动的惯性权重,使粒子在算法后期仍然具有跳出当前区域的能力,利于全局搜索。通过与其他算法在10个测试函数不同维度上的优化结果对比表明,该算法无论对低维还是高维问题求解的收敛速度和求解精度均有优势。将EAMSPSO算法应用于半无限规划问题的求解,实验结果表明,该算法可以用于半无限规划问题的求解,且具有优势。
基金supported by Spark Program of Earthquake Science of China under Grant No.XH15047YNational Natural Science Foundation of China under Grant No.41274062
文摘There was an earthquake swarm of two major events of MS6.3 and MS5.8 on the Xianshuihe fault in November, 2014. The two major earthquakes are both strike-slip events with aftershock zone along NW direction.We have analyzed the characteristics of this earthquake sequence. The b value and the h value show the significant variations in different periods before and after the MS5.8earthquake. Based on the data of historical earthquakes, we also illustrated the moderate-strong seismic activity on the Xianshuihe fault. The Kangding earthquake swarm manifests the seismic activity on Xianshuihe fault may be in the late seismic active period. The occurrence of the Kangding earthquake may be an adjustment of the strong earthquakes on the Xianshuihe fault. The Coulomb failure stress changes caused by the historical earthquakes were also given in this article. The results indicate that the earthquake swarm was encouraged by the historical earthquakes since1893, especially by the MS7.5 Kangding earthquake in1955. The Coulomb failure stress changes also shows the subsequent MS5.8 earthquake was triggered by the MS6.3earthquake.
文摘现实中存在许多人为制造或自然形成的微地形,以其为单位的应变分布与其所在板块的整体应变分布具有差异,本研究选取地壳活动相对活跃的腾冲市和顺镇区域作为试验区,实验表明已有的整体旋转与线性应变模型(Rotation in the Entire Block and Linear Strain Mode,RELSM)在描述板块内部局部微地形应变时表现不佳;为精细刻画板内应变,在已有的RELSM模型基础上,通过引入地形因素,并联合GNSS、InSAR数据,通过改进型粒子群算法反演板内局部区域应变场参数,为局部区域精细化的地壳活动性评估提供帮助.
