滇西重力场动态趋势变化与断层运动
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摘要
以绝对重力做控制,对滇西网1985—2010年流动重力资料进行统一平差处理,平均点值精度为12×10-8ms-2/a;单点重力时变曲线主要呈现出季节性的上下波动和长期性的上升或下降趋势运动,部分点重力动态变化与丽江7.0级地震孕育过程相吻合;基于长期观测的重力场年变化率反映了重力场在一段时期内的趋势性变化:1985—1995年和1996—2003年年变化率图像可能反映丽江7.0级地震前后能量的累积、释放和调整,2003年以后剑川断裂、鹤庆-洱源断裂和红河断裂北段附近重力值上升速度均超过10×10-8ms-2/a;基于初始断裂运动模型正演模拟的滇西重力场年变化率图像与实测图像非常相似,说明断裂运动对重力场趋势性变化有重要贡献;基于长期观测的重力场年变化率反演的滇西主要活动断裂年错动量与地质上给出的结果相仿,基本上反映了各断裂的活动性质。
Controlled by absolute gravity data,mobile gravity data of western Yunnan network from 1985 to 2010 are processed with adjustment of average accuracy of 12×10-8ms-2.The characteristics of single point gravity variation curve are with seasonal fluctuation and trend movement(up or down) in long-term.The gravity dynamic variation of some points is consistent with preparation process of Lijiang Ms7.0 earthquake.The annual change rate of gravity from long-term observation can reflect the trend variation of gravity field in a time period.The annual change rates of gravity in 1985-1995 and 1996-2003 might reflect the energy accumulation and release before and after the Lijiang Ms7.0 earthquake.Since 2003,the rising velocities of gravity are over 10×10-8ms-2/a along the Jianchuan fault,Heqing-Eryuan fault and the northern segment of Red River Fault Zone.On the basis of the initial fault movement model,the forward simulant annual changing rates of gravity are similar with the measured values.It indicates that fault movement has great contribution to the gravity field change.The annual fault movements inversed by annual change rate of gravity are consistent with the geological results,and basically reflect its active characteristics.
Controlled by absolute gravity data,mobile gravity data of western Yunnan network from 1985 to 2010 are processed with adjustment of average accuracy of 12×10-8ms-2.The characteristics of single point gravity variation curve are with seasonal fluctuation and trend movement(up or down) in long-term.The gravity dynamic variation of some points is consistent with preparation process of Lijiang Ms7.0 earthquake.The annual change rate of gravity from long-term observation can reflect the trend variation of gravity field in a time period.The annual change rates of gravity in 1985-1995 and 1996-2003 might reflect the energy accumulation and release before and after the Lijiang Ms7.0 earthquake.Since 2003,the rising velocities of gravity are over 10×10-8ms-2/a along the Jianchuan fault,Heqing-Eryuan fault and the northern segment of Red River Fault Zone.On the basis of the initial fault movement model,the forward simulant annual changing rates of gravity are similar with the measured values.It indicates that fault movement has great contribution to the gravity field change.The annual fault movements inversed by annual change rate of gravity are consistent with the geological results,and basically reflect its active characteristics.
引文
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14徐鸣洁,等.利用接收函数研究哀牢山-红河断裂带地壳上地幔特征[J].中国科学(D辑,地球科学):2005,35(8):729-737.(Xun Mingjie,et al.Study of the char-acteristics of crust-upper-mantle in Ainaoshan-Red riverfault zone using receiver function[J].Scientia Sinica Ter-rae,2005,35(8):729-737)
15白志明.深地震测深剖面的层析成像研究及其应用[D].中国地震局地球物理研究所,2002.(Bai Zhiming.Tomographic investigation and application of deep seismicsounding[D].Institute of Geophysics,China EarthquakeAdministration,2002)
16白志明,王椿镛.云南地区上部地壳结构和地震构造环境的层析成像研究[J].地震学报,2003,25(2):117-127.(Bai Zhiming and Wang Chunyong.Tomographicinvestigation of the upper crustal structure and seismotec-tonic environments in Yunnan province[J].Acta Seis-mologica Sinica,2003,25(2):117-127)
17 Rongjiang Wang,Francisco Lorenzo-martin and FrankRoth..PSGRN/PSCMP-a new code for caluclation co-andpost-seismic deformation,geoid and gravity changes basedon the viscoelastic-gravitational dislocation theory[J].Computers and Geosciences,2006,32:527-541.
18申重阳.地壳形变与密度变化耦合运动探析[J].大地测量与地球动力学,2005,(3):8-12.(Shen Chongyang.Preliminary analysis of coupling movement between crustaldeformation and density change[J].Journal of Geodesyand Geodyamics,2005,25(3):8-12)
2 Okubo S.Potential and gravity changes raised by point dislo-cations[J].Geophys J Int.,1991,105:573-586.
3 Okada Y.Surface deformation due to shear and tensile faultsin a half-space[J].Bull Seismol Soc Am.,1985,75:1 135-1 154.
4国家地震局地质研究所,云南省地震局编.滇西北地区活动断裂[M].北京:地震出版社,1990.(Institute of Geol-ogy,China Earthquake Administration and Earthquake Ad-ministration of Yunnan Province.Active faults north-west ofYunnan province[M].Beijing:Seismological Press,1990)
5 Jackson J and Mckenzic D.The relationship between platemotions and seismic moment tensors,and the rates of activedeformation in the Meditcrrancan and Middle East[J].Geoph J.,1988,93:45-73.
6 Kivatzi A.Rates of crustal deformation in the North Acgantrouth-North Anatolian Fault deduced form seismicity[J].Pageoth,1991,126(4):421-432-?.
7黄建梁,申重阳,李辉.断层地质位错模型的局部重力异常稳健反演分析[J].地震学报,1998,20(1):86-95.(Huang Jianliang,Shen Chongyang and Li Hui.Robust in-version of local gravity anomaly with the fault geological dis-location model[J].Acta Seismologica Sinica,1998,20(1):86-95)
8 Zhao Shaorong,Chao Dingbo and Xu Jusheng.Determina-tion of current active segments at the Red River Fault Zoneby inversion of GPS baseline changes[J].J Geodynamics,1993,17(3):145-154.
9申重阳,等.滇西重力断层运动时间分布特征的初步研究[J].大地测量与地球动力学,2002,(2):68-74.(ShenChongyang,et al.Preliminary study on characteristics of timedistribution of fault movement with gravity data in westiernYunnan,[J].Journal of Geodesy and Geodyamics,2002,(2):68-74)
10申重阳,李辉,付广裕.丽江7.0级地震重力前兆模式研究[J].地震学报,2003,25(2):163-171.(ShenChongyang,Li Hui and Fu Guangyu.Study on a gravityprecursor mode of Lijiang earthquake with Ms7.0[J].ActaSeismologica Sinica,2003,25(2):163-171)
11冯锐.中国地壳厚度及上地幔三维密度分布(三维重力反演结果)[J].地震学报,1985,7(2):143-157.(FengRui.Crustal thickness and up-mantle 3-D density distribu-tion of China(3-D gravity inversion)[J].Acta Seismologi-ca Sinica,1985,7(2):143-157)
12朱思林,等.滇西实验场区三维重力反演研究[J].地壳形变与地震,1994,(1):1-10.(Zhu Silin,et al.Threedimensional inversion fo gravity anomalies in the westernYunnan[J].Crustal Deformation and Earthquake,1994,(1):1-10)
13张中杰,等.三江地区地壳结构及动力学意义:云南遮放-宾川地震反射/折射剖面的启示[J].中国科学(D辑,地球科学),2005b,35(4):314-319.(ZhangZhongjie,et al.crustal structure and synamic significancein Sanjiang area:the apocalypse of Yunnan Zhefang-Bing-chuan profile[J].Scientia Sinica Terrae,2005b,35(4):314-319)
14徐鸣洁,等.利用接收函数研究哀牢山-红河断裂带地壳上地幔特征[J].中国科学(D辑,地球科学):2005,35(8):729-737.(Xun Mingjie,et al.Study of the char-acteristics of crust-upper-mantle in Ainaoshan-Red riverfault zone using receiver function[J].Scientia Sinica Ter-rae,2005,35(8):729-737)
15白志明.深地震测深剖面的层析成像研究及其应用[D].中国地震局地球物理研究所,2002.(Bai Zhiming.Tomographic investigation and application of deep seismicsounding[D].Institute of Geophysics,China EarthquakeAdministration,2002)
16白志明,王椿镛.云南地区上部地壳结构和地震构造环境的层析成像研究[J].地震学报,2003,25(2):117-127.(Bai Zhiming and Wang Chunyong.Tomographicinvestigation of the upper crustal structure and seismotec-tonic environments in Yunnan province[J].Acta Seis-mologica Sinica,2003,25(2):117-127)
17 Rongjiang Wang,Francisco Lorenzo-martin and FrankRoth..PSGRN/PSCMP-a new code for caluclation co-andpost-seismic deformation,geoid and gravity changes basedon the viscoelastic-gravitational dislocation theory[J].Computers and Geosciences,2006,32:527-541.
18申重阳.地壳形变与密度变化耦合运动探析[J].大地测量与地球动力学,2005,(3):8-12.(Shen Chongyang.Preliminary analysis of coupling movement between crustaldeformation and density change[J].Journal of Geodesyand Geodyamics,2005,25(3):8-12)
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