河西地区重力变化与2013年门源M_S5.1地震研究
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摘要
基于2010年5月—2013年10月的6期在河西地区流动重力测量资料获得的重力场时空变化结果,分析该区近期重力场变化及与2013年门源MS5.1地震的关系。结果表明:河西地区重力场变化空间分布显示在活动断裂附近重力变化较大,沿祁连山北缘断裂、昌马—门源断裂及庄浪河断裂形成与断裂带走向基本一致的重力变化高梯度带,反映了断裂构造活动引起的重力局部异常变化特征。2013年门源MS5.1地震发生在重力变化的高梯度带附近。
To study the relationship between gravity field variation and earthquakes,this study analyzes the relationship between gravity field variation in the Hexi area and the MS5.1earthquake area near Menyuan in 2013 on the basis of gravity field variations obtained through mobile gravity observation in the Hexi area from May 2010 to October 2013.On the basis of gravity change in the Hexi area during the study period,the accumulated gravity change in a longer period is applied using the line from Minle to Tianzhu in the northern Qilian Mountain as a borderline of positive and negative gravity.The gravity change is positive in the Hexi Corridor north of the borderline and negative in the Qilian Mountain area south of the line.In the north and south region of the borderline,the accumulated gravity variation changes sharply from positive to negative.Moreover,a high gradient belt of gravity change located on the North Qilian Mountain Fault is formed between Tianzhu and Minle,and the accumulated gravity positive change is up to 70×10-8 ms-2in the northern region.The accumulated gravity change forms two negative extreme value zones in E'bao and Tianzhu,where the minimum is-70 × 10-8 ms-2,and a negative depression zone is formed between Tianzhu and E'bao,where the 2012 MS4.9and 2013 MS5.1earthquakes near Menyuan occurred.The results shows that the gravity field variation is larger near the active faults in the Hexi area,including the Qilianshan North Rim Fault located between E'bao,Menyuan,and Gulang,and the Changma-Menyuan and Zhuanglang River faults.Moreover,a high gradient belt of gravity variation in these regions is consistent with these faults.The Menyuan MS5.1earthquake occurred between E'bao and Menyuan near the high gradient zone of gravity variation.The gravity variation shows the local gravity anomaly characteristics caused by fault tectonic activity.
To study the relationship between gravity field variation and earthquakes,this study analyzes the relationship between gravity field variation in the Hexi area and the MS5.1earthquake area near Menyuan in 2013 on the basis of gravity field variations obtained through mobile gravity observation in the Hexi area from May 2010 to October 2013.On the basis of gravity change in the Hexi area during the study period,the accumulated gravity change in a longer period is applied using the line from Minle to Tianzhu in the northern Qilian Mountain as a borderline of positive and negative gravity.The gravity change is positive in the Hexi Corridor north of the borderline and negative in the Qilian Mountain area south of the line.In the north and south region of the borderline,the accumulated gravity variation changes sharply from positive to negative.Moreover,a high gradient belt of gravity change located on the North Qilian Mountain Fault is formed between Tianzhu and Minle,and the accumulated gravity positive change is up to 70×10-8 ms-2in the northern region.The accumulated gravity change forms two negative extreme value zones in E'bao and Tianzhu,where the minimum is-70 × 10-8 ms-2,and a negative depression zone is formed between Tianzhu and E'bao,where the 2012 MS4.9and 2013 MS5.1earthquakes near Menyuan occurred.The results shows that the gravity field variation is larger near the active faults in the Hexi area,including the Qilianshan North Rim Fault located between E'bao,Menyuan,and Gulang,and the Changma-Menyuan and Zhuanglang River faults.Moreover,a high gradient belt of gravity variation in these regions is consistent with these faults.The Menyuan MS5.1earthquake occurred between E'bao and Menyuan near the high gradient zone of gravity variation.The gravity variation shows the local gravity anomaly characteristics caused by fault tectonic activity.
引文
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[12]任镇寰,李健梅,乔计花,宫会玲.广西灵山地区深部断裂系统的重力资料解释[J].华南地震,2012,32(2):1-8.REN Zhen-huan,LI Jian-mei,QIAO Ji-hua,GONG Hui-ling.Interpretation of Gravity Data of Deep Fault System in Lingshan Region of Guangxi[J].South China Journal of Seismology,2012,32(2):1-8.(in Chinese)
[2]陈运泰,顾浩鼎,卢造勋,等.1975年海城地震与1976年唐山地震前后的重力变化[J].地震学报,1980,2(1):21-30.CHEN Yun-tai,GU Hao-ding,LU Zao-xun,et al.Variations of Gravity Before and After Haicheng Earthquake,1975 and Tangshan Earthquake,1976[J].Acta Seismologica Sinica,1980,2(1):21-31.(in Chinese)
[3]吴国华,罗增雄.丽江7.0级地震前后滇西实验场的重力异常变化特征[J].地震研究,1997,20(1):101-107.WU Guo-hua,LUO Zeng-xiong.Gravity Abnormal Variation Characteristics Before Lijiang MS7.0Earthquake in the Experiment Field in Western Yunnan[J].Journal of Seismological Research,1997,20(1):101-107.(in Chinese)
[4]祝意青,王双绪,江在森,等.昆仑山口西8.1级地震前重力变化[J].地震学报,2003,25(3):291-297.ZHU Yi-qing,WANG Shuang-xu,JIANG Zai-sen,et al.Gravity Variation Before Kunlun MS8.1Earthquake[J].Acta Seismologica Sinica,2003,25(3):291-297.(in Chinese)
[5]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.ZHU Yi-qing,LIANG Wei-feng,XU Yun-ma.Dynamic Variation of Gravity Field before and After Wenchuan MS8.0Earthquake[J].Acta Seismologica Sinica,2009,32(6):633-640.(in Chinese)
[6]祝意青,胡斌,朱桂芝,等.民乐MS6.1级、岷县5.2级地震前区域重力场变化[J].大地测量与地球动力学,2005,25(1):24-29.ZHU Yi-qing,HU Bin,ZHU Gui-zhi,et al.Research on the Variation of Gravity Field Before Minle MS6.1and Minxian MS5.2Earthquakes[J].Journal of Geodesyand Geodynamics,2005,25(1):24-29.(in Chinese)
[7]祝意青,梁伟锋,李辉,等.中国大陆重力场变化及其引起的地球动力学特征[J].武汉大学学报:信息科学版,2007,32(3):246-250.ZHU Yi-qing,LIANG Wei-feng,LI Hui,et al.Studies on Gravity Field Variations and Geodynamic Characteristics in Mainland of China[J].Geomatics and Information Science of Wuhan University,2007,32(3):246-250.(in Chinese)
[8]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):2538-2546.ZHU Yi-qing,XU Yun-ma,LV Yi-pei,et al.Relations between Gravity Variation of Longmenshan Fault Zone and Wenchuan MS8.0 Earthquake[J].Chinese J Geophys,2009,52(10):2538-2546.(in Chinese)
[9]褚庆忠,武泽,邵先杰,等.地震重力异常形成机理及其在地震预报中的作用[J].地震工程学报,2014,36(1):201-206.CHU Qing-zhong,WU Ze,SHAO Xian-jie,et al.Mechanism of Gravity Anomaly before Earthquake and Its Role in Earthquake Prediction[J].China Earthquake Engineering Journal,2014,36(1):201-206.(in Chinese)
[10]张晶.中强震前重复流动重力异常的模糊识别[J].壳形变与地震,1996,16(4):66-70.ZHANG Jing.Fuzzy Recognition of Abnormal in Repeat Mobile Gravity Before Moderate Earthquake[J].Crustal Deformation and Earthquake,1996,16(4):66-70.(in Chinese)
[11]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):1-10LI Hui,SHEN Chong-yang,SUN Shao-an,et al.Dynamic Gravity Change in Recent Years in China Continent[J].Journal of Geodesy and Geodynamics,2009,29(3):1-10.(in Chinese)
[12]任镇寰,李健梅,乔计花,宫会玲.广西灵山地区深部断裂系统的重力资料解释[J].华南地震,2012,32(2):1-8.REN Zhen-huan,LI Jian-mei,QIAO Ji-hua,GONG Hui-ling.Interpretation of Gravity Data of Deep Fault System in Lingshan Region of Guangxi[J].South China Journal of Seismology,2012,32(2):1-8.(in Chinese)
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