遗传算法反演龙门山断裂带断层三维滑动参数研究
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摘要
利用位错理论模型将遗传算法运用于断层三维滑动参数反演问题的求解,采用川西地区2004—2007年GPS观测数据对龙门山断裂带主要断层的三维滑动速率进行计算分析。结果表明:反演结果在量值上整体较小,与地质结果具有较好的一致性,走滑分量︱U1︱<3.2 mm/a,倾滑分量︱U2︱<1.54 mm/a,张开分量︱U3︱<2.5mm/a,低滑动速率反映断层的闭锁及应力的积累及大地震发生的危险性;局部分量较地质结果偏大,反映实测GPS数据反演结果体现的是断层实时活动状态;遗传算法的全局收敛、不依赖初值等优点使结果更加稳定,而张开分量显示局部不规律性,表现出各子断层空间活动不均匀性。
Based on the dislocation theory model,genetic algorithm was used to inverse the three-dimensional slip parameter of fault.The GPS data from 2004 to 2007 in the western of Sichuan were used to calculate the three-dimensional slip rates of the main faults in Longmenshan fault zone.The results showed that the inversion,which accorded with the geological result,was low on the whole,strike-slip component ︱U1︱<3.2 mm/a,dip-slip component ︱U2︱<1.54 mm/a,stretch component ︱U3︱<2.5 mm/a;low slip rate indicated the closure of the fault,the accumulation of stress and the probability of megaseism;part component,which was lager than the geological result,indicated that the actual GPS data inversion displayed the real-time active state of the fault;the results were stable because of the global convergence and independent initial value of genetic algorithm;stretch component indicated that the part was irregular and the space activities of different sub-faults were inhomogeneous.
Based on the dislocation theory model,genetic algorithm was used to inverse the three-dimensional slip parameter of fault.The GPS data from 2004 to 2007 in the western of Sichuan were used to calculate the three-dimensional slip rates of the main faults in Longmenshan fault zone.The results showed that the inversion,which accorded with the geological result,was low on the whole,strike-slip component ︱U1︱<3.2 mm/a,dip-slip component ︱U2︱<1.54 mm/a,stretch component ︱U3︱<2.5 mm/a;low slip rate indicated the closure of the fault,the accumulation of stress and the probability of megaseism;part component,which was lager than the geological result,indicated that the actual GPS data inversion displayed the real-time active state of the fault;the results were stable because of the global convergence and independent initial value of genetic algorithm;stretch component indicated that the part was irregular and the space activities of different sub-faults were inhomogeneous.
引文
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[14]李传友,宋方敏,冉勇康.龙门山断裂带北段晚第四纪活动性讨论[J].地震地质,2004,26(2):248-258.
[15]唐文清,刘宇平,陈智梁,等.龙门山断裂构造带GPS研究[J].大地测量与地球动力学,2004,24(3):57-59.
[16]李勇,周荣军,Densmore A L,等.青藏高原东缘龙门山晚新生代走滑-逆冲作用的地貌标志[J].第四纪研究,2006,26(1):40-51.
[17]张培震,徐锡伟,闻学泽,等.2008年汶川8.0级地震发震断裂的滑动速率、复发周期和构造成因[J].地球物理学报,2008,51(4):1066-1073.
[18]彭建兵,马润勇,范文,等.汶川大震的科学思考[J].地球科学与环境学报,2009,31(1):1-29.
[19]白贵霞,程传录,郭春喜,等.汶川地震地形形变监测与分析[J].地球科学与环境学报,2010,32(2):205-210.
[2]Murray M H,Marshall G A,Lisowski M,et al.The 1992Ms=7 Cape Mendocino,California,Earthquake:CoseismicDeformation at the South End of the Cascadia Megathrust[J].Journal of Geophysical Research,1996,101(B8):17707-17725.
[3]Freymueller J,Murray M H,Segall P,et al.Kinematics of thePacific-North America Plate Boundary Zone,Northern Cali-fornia[J].Journal of Geophysical Research,1999,104(B4):7419-7441.
[4]朱桂芝,石耀霖,祝意青,等.遗传有限元法反演西安地区的地层密度变化[J].地震地质,2008,30(2):544-552.
[5]刘宁,张永志,吴小利,等.通过重力场用蚁群算法反演活动断层运动[J].大地测量与地球动力学,2009,29(4):30-33.
[6]李爽,许才军,王新洲.位错模式反演的算法研究[J].大地测量与地球动力学,2003,23(1):53-57.
[7]王小平,曹立明.遗传算法:理论、应用与软件实现[M].西安:西安交通大学出版社,2002.
[8]邹德强,王晓尧.遗传算法在高路堤沉降反演优化中的应用[J].湖南交通科技,2003,29(4):16-19.
[9]翟越,赵均海.基于自适应混合遗传算法的岩石类材料动态参数反演[J].地球科学与环境学报,2008,30(3):286-291.
[10]郭嗣琮,陈刚.信息科学中的软计算方法[M].沈阳:东北大学出版社,2001.
[11]Okada Y.Surface Deformation Due to Shear and TensileFaults in a Half-space[J].Bulletin of the Seismological Socie-ty of America,1985,75(4):1135-1154.
[12]Okada Y.Internal Deformation Due to Shear and TensileFaults in a Half-space[J].Bulletin of the Seismological Socie-ty of America,1992,82(2):1018-1040.
[13]张永志,王卫东,魏玉明,等.利用GPS资料反演祁连山断层的三维滑动速率[J].大地测量与地球动力学,2006,26(1):31-35.
[14]李传友,宋方敏,冉勇康.龙门山断裂带北段晚第四纪活动性讨论[J].地震地质,2004,26(2):248-258.
[15]唐文清,刘宇平,陈智梁,等.龙门山断裂构造带GPS研究[J].大地测量与地球动力学,2004,24(3):57-59.
[16]李勇,周荣军,Densmore A L,等.青藏高原东缘龙门山晚新生代走滑-逆冲作用的地貌标志[J].第四纪研究,2006,26(1):40-51.
[17]张培震,徐锡伟,闻学泽,等.2008年汶川8.0级地震发震断裂的滑动速率、复发周期和构造成因[J].地球物理学报,2008,51(4):1066-1073.
[18]彭建兵,马润勇,范文,等.汶川大震的科学思考[J].地球科学与环境学报,2009,31(1):1-29.
[19]白贵霞,程传录,郭春喜,等.汶川地震地形形变监测与分析[J].地球科学与环境学报,2010,32(2):205-210.
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