汶川地震前后青藏高原东北缘重力场动态变化研究
|
摘要
通过对青藏高原东北缘重力观测资料进行整体平差计算,系统分析了该区重力场在汶川8.0级地震前后重力场的时空动态演化特征。研究结果表明,汶川地震的发生使青藏高原深部物质向北东运移,且部分通道受鄂尔多斯陆块的阻隔,青藏高原东北缘区域重力场出现大空间尺度的趋势性显著重力变化;汶川地震后,甘、宁、陕交界的六盘山断裂带与西秦岭北缘断裂带以及之间地区重力场出现显著的非均匀变化,该地区受汶川大地震的影响显著。
Temporal-spatial evolution of gravity field before the Wenchun MS8.0 earthquake has been analyzed systematically by integrally adjusting the gravity observation data from the northeastern edge of the Tibetan Plateau.The results show that deep material of Tibetan Plateau moved northeastward after Wenchun MS8.0 earthquake,and some channels have been blocked by the Ordos block.Regional gravity field has changed significantly on a large spatial scale.After the Wenchun earthquake,gravity field changed non-uniformly between Liupanshan fault zone which borders land of Gan-Ning-Shan and the fault zone along the north edge of west Qinling mountains.This area has been affected by the Wenchun earthquake significantly.
Temporal-spatial evolution of gravity field before the Wenchun MS8.0 earthquake has been analyzed systematically by integrally adjusting the gravity observation data from the northeastern edge of the Tibetan Plateau.The results show that deep material of Tibetan Plateau moved northeastward after Wenchun MS8.0 earthquake,and some channels have been blocked by the Ordos block.Regional gravity field has changed significantly on a large spatial scale.After the Wenchun earthquake,gravity field changed non-uniformly between Liupanshan fault zone which borders land of Gan-Ning-Shan and the fault zone along the north edge of west Qinling mountains.This area has been affected by the Wenchun earthquake significantly.
引文
[1]滕吉文,白登海,杨辉,等.2008年汶川MS8.0地震发生的深层过程和动力学响应[J].地球物理学报,2008,51(5):1385-1402.
[2]刘杰,郭铁栓,杨立明,等.汶川8.0级地震前地震趋势分析意见的回顾[J].地震,2009,29(1):40-52.
[3]牛安福,张凌空,闫伟,等.汶川地震前南北地震带中北段地形变变化特征的研究[J].地震,2009,29(1):100-107.
[4]祝意青,李辉,朱桂芝,等.青藏块体东北缘重力场演化与地震活动[J].地震学报,2004,26(增):71-78.
[5]祝意青,胡斌,朱桂芝,等.民乐6.1、岷县5.2级地震前区域重力场变化研究[J].大地测量与地球动力学,2005,25(1):24-29.
[6]梁伟锋,祝意青,徐云马,等.2008年肃南5.0级地震前的重力变化[J].大地测量与地球动力学,2010,30(2):10-13.
[7]祝意青,徐云马,吕弋培,等.龙门山断裂带重力变化与汶川8.0级地震关系研究[J].地球物理学报,2009,52(10):2 538-2 546.
[8]祝意青,梁伟锋,徐云马,等.汶川MS8.0地震前后的重力场动态变化[J].地震学报,2010,32(6):633-640.
[9]Zhu Y,Zhan F B,Zhou J,et al.Gravity Measurements and Their Variations before the 2008Wen-chuan Earthquake[J].BSSA,2010,100(5B):2 815-2 824.
[10]吴立辛,杨明芝,赵卫明,等.利用重力多尺度分解资料反演青藏高原东北缘地壳厚度[J].大地测量与地球动力学,2011,31(1):19-23.
[11]张希,张晓亮,张四新,等.青藏块体东北缘近期GPS水平运动特征与汶川大震影响[J].地震研究,2010,33(4):265-268.
[12]张希,王双绪,张晓亮,等.昆仑山与汶川强烈地震对青藏块体东北缘地壳运动及应变积累的影响[J].地球学报,2010,31(1):32-42.
[13]赵翠萍,陈章立,华卫,等.中国大陆主要地震活动区中小地震震源参数研究[J].地球物理学报,2011,54(6):1 478-1 489.
[14]袁道阳,张培震,刘百篪,等.青藏高原东北缘晚第四纪活动构造的几何图像与构造转换[J].地质学报,2004,78(2):270-278.
[15]虢顺民,江在森,张崇立.青藏高原东北缘晚第四纪块体划分与运动态势研究[J].地震地质,2000,22(2):219-231.
[16]Chen Y T,Gu H D,Lu Z X.Variations of gravity before and after the haicheng earthquake,1975,and the tangshan earthquake,1976[J].Physics of the Earth and Planetary Interiors,1979,18:330-338.
[17]Imanishi Y,Sato T,Higashi T,et al.A network of superconducting gravimeters detects submicro-gal coseismic gravity changes[J].Science,2004,306:476-478.
[18]Kuo J T,Zheng J H,Song S H.Determination of earthquake epicentroids by inversion of gravityvariation data in the BTTZ region,China[J].Tectonophysics,1999,312(2):267-281.
[2]刘杰,郭铁栓,杨立明,等.汶川8.0级地震前地震趋势分析意见的回顾[J].地震,2009,29(1):40-52.
[3]牛安福,张凌空,闫伟,等.汶川地震前南北地震带中北段地形变变化特征的研究[J].地震,2009,29(1):100-107.
[4]祝意青,李辉,朱桂芝,等.青藏块体东北缘重力场演化与地震活动[J].地震学报,2004,26(增):71-78.
[5]祝意青,胡斌,朱桂芝,等.民乐6.1、岷县5.2级地震前区域重力场变化研究[J].大地测量与地球动力学,2005,25(1):24-29.
[6]梁伟锋,祝意青,徐云马,等.2008年肃南5.0级地震前的重力变化[J].大地测量与地球动力学,2010,30(2):10-13.
[7]祝意青,徐云马,吕弋培,等.龙门山断裂带重力变化与汶川8.0级地震关系研究[J].地球物理学报,2009,52(10):2 538-2 546.
[8]祝意青,梁伟锋,徐云马,等.汶川MS8.0地震前后的重力场动态变化[J].地震学报,2010,32(6):633-640.
[9]Zhu Y,Zhan F B,Zhou J,et al.Gravity Measurements and Their Variations before the 2008Wen-chuan Earthquake[J].BSSA,2010,100(5B):2 815-2 824.
[10]吴立辛,杨明芝,赵卫明,等.利用重力多尺度分解资料反演青藏高原东北缘地壳厚度[J].大地测量与地球动力学,2011,31(1):19-23.
[11]张希,张晓亮,张四新,等.青藏块体东北缘近期GPS水平运动特征与汶川大震影响[J].地震研究,2010,33(4):265-268.
[12]张希,王双绪,张晓亮,等.昆仑山与汶川强烈地震对青藏块体东北缘地壳运动及应变积累的影响[J].地球学报,2010,31(1):32-42.
[13]赵翠萍,陈章立,华卫,等.中国大陆主要地震活动区中小地震震源参数研究[J].地球物理学报,2011,54(6):1 478-1 489.
[14]袁道阳,张培震,刘百篪,等.青藏高原东北缘晚第四纪活动构造的几何图像与构造转换[J].地质学报,2004,78(2):270-278.
[15]虢顺民,江在森,张崇立.青藏高原东北缘晚第四纪块体划分与运动态势研究[J].地震地质,2000,22(2):219-231.
[16]Chen Y T,Gu H D,Lu Z X.Variations of gravity before and after the haicheng earthquake,1975,and the tangshan earthquake,1976[J].Physics of the Earth and Planetary Interiors,1979,18:330-338.
[17]Imanishi Y,Sato T,Higashi T,et al.A network of superconducting gravimeters detects submicro-gal coseismic gravity changes[J].Science,2004,306:476-478.
[18]Kuo J T,Zheng J H,Song S H.Determination of earthquake epicentroids by inversion of gravityvariation data in the BTTZ region,China[J].Tectonophysics,1999,312(2):267-281.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心