新疆天山中部重力场时空变化特征研究
|
摘要
利用1987～2011年新疆地区的流动重力资料,对多期数据进行统一起算基准平差计算,绘制出新疆天山中部地区区域测段段差时序变化图、测线重力变化剖面图以及乌鲁木齐地区的重力场变化等值线图,并结合地震地质构造背景,分析新疆天山中部重力场变化特征。研究结果显示:独山子、宁家河测区重力变化较大,异常变化比较明显;乌鲁木齐地区相对稳定,空间分布比较集中,重力场正负变化区交替出现,重力场变化不大,能量正处于积累的过程。
Using adjustment calculation with the uniform starting datum on the 50 terms of mobile gravity data from 1987 to 2011 in Xinjiang,we obtained the isoline map of gravity field in Urumqi and its surrounding areas,time-series curve of gravity difference of different measuring segment,profiles of gravity variation in three measuring line in the central Tianshan,Xinjiang.Combined with seismogeology tectonic background,we analyzed the gravity field variations of the central Tianshan in Xinjiang.The results showed that the spatial distribution of gravity was more centralized and the positive gravity variation areas alternated with the negative ones in Urumqi and its surrounding area.There was little change in the gravity field and the energy was in accumulation,which indicated that Urumqi and its surrounding areas were the medium and small earthquake-prone areas.The gravity was negative which varied largely in Dushanzi and Ningjiahe measuring area,which showed that curst was uplifting and the material density decreased continuously in these two measuring areas.
Using adjustment calculation with the uniform starting datum on the 50 terms of mobile gravity data from 1987 to 2011 in Xinjiang,we obtained the isoline map of gravity field in Urumqi and its surrounding areas,time-series curve of gravity difference of different measuring segment,profiles of gravity variation in three measuring line in the central Tianshan,Xinjiang.Combined with seismogeology tectonic background,we analyzed the gravity field variations of the central Tianshan in Xinjiang.The results showed that the spatial distribution of gravity was more centralized and the positive gravity variation areas alternated with the negative ones in Urumqi and its surrounding area.There was little change in the gravity field and the energy was in accumulation,which indicated that Urumqi and its surrounding areas were the medium and small earthquake-prone areas.The gravity was negative which varied largely in Dushanzi and Ningjiahe measuring area,which showed that curst was uplifting and the material density decreased continuously in these two measuring areas.
引文
海力.1996.乌鲁木齐地区重力非潮汐变化及其与地震活动的关系[J].地壳形变与地震,16(4):71-78.
贾民育.1987.地震重力变化的判定问题[J].地壳形变与地震,7(1):23-26.
江厚龙,刘国顺,杨夏孟,等.2011.精准农业中不同取样间距下Kriging插值精度对比研究[J].土壤通报,42(4):879-885.
刘代芹,王晓强,李杰,等.2009.新疆南天山地区重力场及其动态演化特征[J].西北地震学报,31(2):174-178.
刘代芹,王晓强,李杰,等.2010.2009年阿合奇MS5.5、阿图什MS5.0地震前后重力场变化分析[J].内陆地震,24(2):144-148.
张健超.2002.天山地区流动重力复测资料前兆异常识别判据、地震预报指标及效能评价[J].内陆地震,16(4):306-316.
祝意青,胡斌,李辉,等.2003.新疆地区重力变化与伽师6.8级地震[J].大地测量与地球动学,23(3):66-69.
祝意青,梁伟锋,徐云马,等.2010.汶川MS8.0地震前后的重力场动态变化[J].地震学报,32(6):633-640.
祝意青,徐云马,吕弋培,等.2009.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,52(10):2538-2546.
贾民育.1987.地震重力变化的判定问题[J].地壳形变与地震,7(1):23-26.
江厚龙,刘国顺,杨夏孟,等.2011.精准农业中不同取样间距下Kriging插值精度对比研究[J].土壤通报,42(4):879-885.
刘代芹,王晓强,李杰,等.2009.新疆南天山地区重力场及其动态演化特征[J].西北地震学报,31(2):174-178.
刘代芹,王晓强,李杰,等.2010.2009年阿合奇MS5.5、阿图什MS5.0地震前后重力场变化分析[J].内陆地震,24(2):144-148.
张健超.2002.天山地区流动重力复测资料前兆异常识别判据、地震预报指标及效能评价[J].内陆地震,16(4):306-316.
祝意青,胡斌,李辉,等.2003.新疆地区重力变化与伽师6.8级地震[J].大地测量与地球动学,23(3):66-69.
祝意青,梁伟锋,徐云马,等.2010.汶川MS8.0地震前后的重力场动态变化[J].地震学报,32(6):633-640.
祝意青,徐云马,吕弋培,等.2009.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,52(10):2538-2546.
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