滇西地面水准面的变化与地震发生的研究
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摘要
基于1985~1998年间滇西重复重力测量网的重复测量,首次测定了该地区的非潮汐垂线偏差时变(PLV)和地面水准面变形(GLSD)。利用这些数据研究发生在附近的地震时发现了一个现象:地震前地震中心附近地面水准面隆起,震后下凹。以测定的地面水准面为主线,研究了这一区域的1985~1998年间8次大于4.6级的地震。用地面水准面隆起和下凹的时间变化,来描述地震发生的整个过程。测定了与地震发生有关的地面水准面形状变化,包括尺度、最大高度、最高点所在位置等等。GLSD与地震发生之间的这种巧合型,不仅展示了研究地震的一种新方法的应用,而且也验证了本地区非潮汐垂线偏差时变和大地水准面变形。
Based on the repeated measurements of the gravimetric network in West Yunnan,China during 1985～1998,the non-tidal Plumb Line Variations(PLV) and the Deformations of the Ground Level Surface(GLSD) in this area have been determined for the first time.Interesting phenomena have been discovered by using these measurements to study the earthquakes happening nearby.It appears that there usually exists a raised GLSD around the emerging epicenter before an earthquake,but an opposite GLSD afterwards.Taking the determined GLSD as an index,8 earthquakes(Ms>4.6) occurring in this area during 1985～1998 are to be studied.By timing the GLSD changes,including the raised GLSD as well as the depressed ones,the course of an earthquake event will be described.The shape of the GLSD related to the occurrence of an earthquake,including its size,its maximum height and the location of its summit,has also been measured.The consistency of the description of these earthquakes demonstrates not only the applicability of this new approach in the study of earthquakes but also the reality of the existence of non-tidal plumb line variations and ground level surface deformations in an earthquake event in this area.
Based on the repeated measurements of the gravimetric network in West Yunnan,China during 1985～1998,the non-tidal Plumb Line Variations(PLV) and the Deformations of the Ground Level Surface(GLSD) in this area have been determined for the first time.Interesting phenomena have been discovered by using these measurements to study the earthquakes happening nearby.It appears that there usually exists a raised GLSD around the emerging epicenter before an earthquake,but an opposite GLSD afterwards.Taking the determined GLSD as an index,8 earthquakes(Ms>4.6) occurring in this area during 1985～1998 are to be studied.By timing the GLSD changes,including the raised GLSD as well as the depressed ones,the course of an earthquake event will be described.The shape of the GLSD related to the occurrence of an earthquake,including its size,its maximum height and the location of its summit,has also been measured.The consistency of the description of these earthquakes demonstrates not only the applicability of this new approach in the study of earthquakes but also the reality of the existence of non-tidal plumb line variations and ground level surface deformations in an earthquake event in this area.
引文
[1]顾功叙,郭宗汾,刘克人,等.中国京津唐张地区时间上连续的重力变化与地震的孕育和发生[J].科学通报,1997,42(18):1920-1930.
[2]陈运泰,刘克人,郑金涵,等.局部重力场变化与地震发生的关系合作研究课题的回顾[A].“庆贺郭宗汾教授八十寿辰”暨理论与应用地球物理研讨会论文集[C].北京:气象出版社,2002.
[3]丁一帆,李月锋,丁行斌.现代大地测量学中的垂线偏差[J].大地测量与地球动力学,2006,26(2):115-119.
[4]P.Melchior.The tides of the planet earth[M].Ox-ford:Pergamon Press,1978.
[5]李辉,付广裕,李正心.重复重力测量结果计算垂线片偏差的时间变化[J].地震学报,2001,23(1),61-67.
[6]李月锋,丁行斌,李正心.垂线偏差时变计算公式的讨论[J].桂林工学院学报,2005,25(1):58-61.
[7]李月锋,丁行斌.用重复重力测量测定垂线偏差时变的精度[J].天文学报,2005,46(4):460-473.
[2]陈运泰,刘克人,郑金涵,等.局部重力场变化与地震发生的关系合作研究课题的回顾[A].“庆贺郭宗汾教授八十寿辰”暨理论与应用地球物理研讨会论文集[C].北京:气象出版社,2002.
[3]丁一帆,李月锋,丁行斌.现代大地测量学中的垂线偏差[J].大地测量与地球动力学,2006,26(2):115-119.
[4]P.Melchior.The tides of the planet earth[M].Ox-ford:Pergamon Press,1978.
[5]李辉,付广裕,李正心.重复重力测量结果计算垂线片偏差的时间变化[J].地震学报,2001,23(1),61-67.
[6]李月锋,丁行斌,李正心.垂线偏差时变计算公式的讨论[J].桂林工学院学报,2005,25(1):58-61.
[7]李月锋,丁行斌.用重复重力测量测定垂线偏差时变的精度[J].天文学报,2005,46(4):460-473.
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