青藏高原东缘重力观测及对芦山M7.0地震的反映
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摘要
介绍了青藏高原东缘地区相对重力与绝对重力的观测情况,系统分析了该区域2010以来的区域重力场变化及其与2013年4月20日四川芦山7.0级地震发生的关系。结果表明:(1)芦山7.0级地震前青藏高原东缘重力变化剧烈,芦山地震发生在沿龙门山断裂带南段的重力变化高梯度带的转弯部位;(2)芦山地震距2008年汶川地震不到100km,芦山震中及汶川地震震中均处于重力变化四象限中心,表明汶川地震震后恢复调整变化对芦山地震具有促进作用;(3)基于流动重力异常变化在芦山7.0级地震前做过一定程度的中期预测,尤其是地点预测。
With the introduction of observation on relative gravity and absolute gravity in the eastern Qinghai-Tibet Plateau,gravity field change of the eastern margin of Tibetan Plateau since 2010 and the reflection on the M7.0 earthquake which occurred on April 20,2013 in Lushan,Sichuan were systematically analyzed.The results showed that:(1)Before the Lushan 7.0 earthquake,the gravity of the eastern margin of Tibetan Plateau changed drastically,and the Lushan earthquake occurred in the turning site of the high gradient zone of gravity variation which was along the southern seciont of Longmenshan fault zone.(2) The Lushan earthquake in 2013 was less than 100 km from the 2008 Wenchuan earthquake in terms of location,moreover,Lushan and Wenchuan were at the four-quadrant center of gravity change,which indicated that the restoration and change after Wenchuan earthquake had a promoting effect on the Lushan earthquake.(3)A certain medium-term prediction based on the anomaly change of mobile gravity was made before the Lushan M7.0 earthquake,especially the location prediction.
With the introduction of observation on relative gravity and absolute gravity in the eastern Qinghai-Tibet Plateau,gravity field change of the eastern margin of Tibetan Plateau since 2010 and the reflection on the M7.0 earthquake which occurred on April 20,2013 in Lushan,Sichuan were systematically analyzed.The results showed that:(1)Before the Lushan 7.0 earthquake,the gravity of the eastern margin of Tibetan Plateau changed drastically,and the Lushan earthquake occurred in the turning site of the high gradient zone of gravity variation which was along the southern seciont of Longmenshan fault zone.(2) The Lushan earthquake in 2013 was less than 100 km from the 2008 Wenchuan earthquake in terms of location,moreover,Lushan and Wenchuan were at the four-quadrant center of gravity change,which indicated that the restoration and change after Wenchuan earthquake had a promoting effect on the Lushan earthquake.(3)A certain medium-term prediction based on the anomaly change of mobile gravity was made before the Lushan M7.0 earthquake,especially the location prediction.
引文
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[13]李辉,申重阳,孙少安,等.中国大陆近期重力场动态变化图像[J].大地测量与地球动力学,2009,29(3):1-10.Li H,Shen C Y,Sun S A,et al.Dynamic Gravity Change inRecent Years in China Continent[J].Journal of Geodesy andGeodynamics,2009,29(3):1-10.
[14]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.Zhu Y Q,Liang W F,Zhan F B,et al.Study on DynamicChange of Gravity Field in China Continent[J].Chinese J.Geophys.,2012,55(3):804-813.
[2]楼海,王椿镛,吕智勇,等.2008年汶川MS8.0级地震的深部构造环境——远震P波接收函数和布格重力异常的联合解释[J].中国科学(D辑:地球科学),2008,38(10):1207-1220.Lou H,Wang C Y,Lv Z Y,et al.Deep Tectonic Condition ofthe MS8.0Wenchuan Earthquake of Sichuan,China[J].Sci-ence in China(SeriesD),2008,38(10):1207-1220.
[3]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.Zhang P Z,Xu X W,Wen X Z,et al.Slip Rate and RecurrenceIntervals of the Longmenshan Active Fault Zone,and TectonicImplications for the Mechanism of the May 12 WenchuanEarthquake,2008,Sichuan,China[J].Chinese J.Geophys.,2008,51(4):1066-1073.
[4]江在森,方颖,武艳强,等.汶川8.0级地震前区域地壳活动与变形动态过程.[J]地球物理学报,2009,52(2):505-518.Jiang Z S,Fang Y,Wu Y Q,et al.The Dynamic Process ofRegional Crustal Movement and Deformation before WenchuanMS8.0Earthquake[J].Chinese J.Geophys.,2009,52(2):505-518.
[5]祝意青,梁伟锋,徐云马.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.Zhu Y Q,Liang W F,Xu Y M,et al.Dynamic Variation ofGravity Field Before and After Wenchuan MS8.0Earthquake[J].Acta Seismologica Sinica.,2010,32(6):633-640.
[6]Zhu Y Q,Zhan F B,Zhou J C,et al.Gravity Measurements andTheir Variations before the 2008 Wenchuan Earthquake[J].Bulletin of the Seismological Society of America,2010,100(5B):2815-2824.
[7]滕吉文,白登海,杨辉,等.2008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.Teng J W,Bai D H,Yang H,et al.Deep Processes and Dy-namic Responses Associated with the Wenchuan MS8.0Earth-quake of 2008[J].Chinese J.Geophys.,2008,51(5):1385-1402.
[8]Hubbard J,Shaw J H.Uplift of the Longmen Shan and Tibet-an Plateau,and the 2008 Wenchuan(MS=7.9)Earthquake[J].Nature,2009,458:194-197.
[9]陈运泰,顾浩鼎,卢造勋.1975年海城地震和1976年唐山地震前后的重力变化[J].地震学报,1980,2(1):21-31.Chen Y T,Gu H D,Lu Z X.Variations of Gravity Before andAfter Haicheng Earthquake,1975and Tangshan Earthquake,1976[J].Acta Seismologica Sinica,1980,2(1):21-31.
[10]张永志,梁伟锋,祝意青.丽江7.0级地震过程的重力变化与小波分析[J].西北地震学报,1999,21(2):149-155.Zhang Y Z,Liang W F,Zhu Y Q.The Relationship betweenWavelet Rransformation Results of Gravity Variation and theLijiang MS7.0earthquake[J].Northwestern SeismologicalJournal,1999,21(2):149-155.
[11]孟夏,孟万辉,徐敬文,等.流动重力测量结果及其与地震的关系[J].西北地震学报,2001,23(1):74-77.Meng X,Meng W H,Xu J W,et al.Mobile Gravity Meas-urement Results and Their Relation to Earthquakes[J].Northwestern Seismological Journal,2001,23(1):74-77.
[12]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.Xu H Z.Function of Gravimetry in CMONOC[J].Journal ofGeodesy and Geodynamics,2003,23(3):1-3.
[13]李辉,申重阳,孙少安,等.中国大陆近期重力场动态变化图像[J].大地测量与地球动力学,2009,29(3):1-10.Li H,Shen C Y,Sun S A,et al.Dynamic Gravity Change inRecent Years in China Continent[J].Journal of Geodesy andGeodynamics,2009,29(3):1-10.
[14]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.Zhu Y Q,Liang W F,Zhan F B,et al.Study on DynamicChange of Gravity Field in China Continent[J].Chinese J.Geophys.,2012,55(3):804-813.
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