汶川地震后陕甘川交界地区重力应急监测及变化分析
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摘要
流动重力方便快捷,能快速获取重力场变化信息。汶川8.0级大震后中国地震局立即开展震后重力应急监测,陕甘川交界地区重力观测显示:①汶川震后陕甘川交界的沙洲、碧口、青木川地区形成了重力变化大于60×10-8ms-2的局部重力异常区及其伴生的重力变化高梯度带,重力变化最大值达到70×10-8ms-2多,重力异常与强余震的空间分布存在密切的联系。②望褒线重力与垂直形变变化活跃,靠近断裂重力与垂直形变变化剧烈。③利用重力资料对汶川震后地震趋势进行了正确的判定。
Gravity field change can be quickly obtained by convenient and efficient mobile gravity observation.CEA launched emergency monitor of post-seismic gravity after Wenchuan Ms8.0 earthquake,and the gravity observation in the boundary of Shaan-Gan-Chuan indicates: ① there are regional gravity abnormal area and accompanied high gradient zone of gravity change in the area of Shazhou,Bikou and Qingmuchuan in the boundary.Gravity change is larger than 60 gal and the maximum larger than 70 × 10-8ms-2.These show that there is a close association between gravity amorality and the space distribution of strong aftershock.② there exits obvious change in gravity and vertical deformation in the line of Wang-Bao,and the change in the area near faults is acute.③ a correct judgment had been made based on the gravity data for the earthquake trend after Wenchuan earthquake.
Gravity field change can be quickly obtained by convenient and efficient mobile gravity observation.CEA launched emergency monitor of post-seismic gravity after Wenchuan Ms8.0 earthquake,and the gravity observation in the boundary of Shaan-Gan-Chuan indicates: ① there are regional gravity abnormal area and accompanied high gradient zone of gravity change in the area of Shazhou,Bikou and Qingmuchuan in the boundary.Gravity change is larger than 60 gal and the maximum larger than 70 × 10-8ms-2.These show that there is a close association between gravity amorality and the space distribution of strong aftershock.② there exits obvious change in gravity and vertical deformation in the line of Wang-Bao,and the change in the area near faults is acute.③ a correct judgment had been made based on the gravity data for the earthquake trend after Wenchuan earthquake.
引文
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[11]张四新,张希,王双绪,等.汶川8.0级地震前后地壳垂直形变分析[J].大地测量与地球动力学,2008,28(6):43-46.
[2]孙和平.重力场的时间变化与地球动力学[J].中国科学院院刊,2004,19(3):189-193.
[3]许厚泽.重力观测在中国地壳运动观测网络中的作用[J].大地测量与地球动力学,2003,23(3):1-3.
[4]王勇,张为民,詹金刚,等.重复绝对重力测量观测的滇西地区和拉萨点的重力变化及其意义[J].地球物理学报,2004,47(1):95-100.
[5]徐建桥,周江存,罗少聪,等.武汉台重力长期变化特征研究[J].科学通报,2008,53(5):583-588.
[6]申文斌,刘任莉.利用超导重力数据探测内核超速旋转的研究[J].武汉大学学报:信息科学版,2009,34(1):72-76.
[7]Kuo J T,Zheng J H,Song S H.Determination of earthquake epicentroids by inversion of gravity variation data in the BTTZ region,China[J].Tectonophysics,1999,312(2):267-281.
[8]祝意青,梁伟锋,湛飞并,等.中国大陆重力场动态变化研究[J].地球物理学报,2012,55(3):804-813.
[9]祝意青,梁伟锋,徐云马.重力资料对2008年汶川Ms8.0地震的中期预测[J].国际地震动态,2008(7):36-39.
[10]梁伟锋,祝意青,刘练,等.汶川8.0级地震后川甘陕交界地区的重力变化[J].大地测量与地球动力学,2009,29(5):18-21.
[11]张四新,张希,王双绪,等.汶川8.0级地震前后地壳垂直形变分析[J].大地测量与地球动力学,2008,28(6):43-46.
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