辽宁地区地壳垂直形变演化特征
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摘要
利用辽宁地区多期复测的水准资料,得到1959—1979年、1979—1997年、1997—2010年和1959—2010年多个时间段的垂直形变速率。在此基础上研究了辽宁地区50年的地壳垂直形变演化和构造活动性,以及垂直形变场与地震活动的相关性。结果表明:1959—1979年的垂直形变速率差异变化量最大,地壳活动性较强烈,该时间段内发生了海城7.3级地震。1979—1997年和1997—2010年两个时间段垂直形变速率差异变化量减小,地壳活动性减弱,同时期本区无大震发生。垂直形变速率变化显示出,辽宁地区地壳活动以北北东向和北西-北西西向构造为主,不同时期的垂直形变分别受它们控制。
The repetitive leveling data in Liaoning area was sorted out to obtain the vertical deformation rate during 1959—1979,1979—1997 and 1997—2010.On the basis of the results,the author studied the evolution of vertical crustal deformation,tectonic activity of Liaoning area in 50 years,and the correlation of vertical deformation field with seismic activities.The results show that during 1959 to 1979,the differential change of the vertical deformation rate is the biggest,that reflects the crustal activity is intense,and a Ms7.3 earthquake occurred in Haicheng in this period.During 1979 to 1997 and 1997 to 2010,the differential change of the vertical deformation rate decreased,the crustal activity weakened,and there was no big earthquake occurred in this period.In the period,the differential change of the vertical deformation rate shows that the predominant direction of crust activity of Liaoning area was NNE and NW-NWW,and the vertical deformation in different periods was respectively under the control along these directions.
The repetitive leveling data in Liaoning area was sorted out to obtain the vertical deformation rate during 1959—1979,1979—1997 and 1997—2010.On the basis of the results,the author studied the evolution of vertical crustal deformation,tectonic activity of Liaoning area in 50 years,and the correlation of vertical deformation field with seismic activities.The results show that during 1959 to 1979,the differential change of the vertical deformation rate is the biggest,that reflects the crustal activity is intense,and a Ms7.3 earthquake occurred in Haicheng in this period.During 1979 to 1997 and 1997 to 2010,the differential change of the vertical deformation rate decreased,the crustal activity weakened,and there was no big earthquake occurred in this period.In the period,the differential change of the vertical deformation rate shows that the predominant direction of crust activity of Liaoning area was NNE and NW-NWW,and the vertical deformation in different periods was respectively under the control along these directions.
引文
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2黄立人,杨国华,刘天奎.用速率面拟合法研究华北部分地区的现今地壳垂直运动[J].地壳形变与地震,1989,(3):26-35.(Huang Liren,Yang Guohua and Liu Tiankui.Study of present vertical crustal movements in part of northChina with the fitting method of velocity surface[J].CrustalDeformation and Earthquake,1989,(3):26-35)
3张祖胜.应用大地形变资料估计我国大陆地区近几十年的地震趋势[A].见:国家地震局分析预报中心编.中国地震大形势预测研究[C].北京:地震出版社,1990,50-65.(Zhang Zusheng.Earthquake trend estimation in Main-land China in next decades with geodetic data[A].In:Cent-ter for Analysis and Prediction,State Seistnological Bureau,ed.Predicfion and researches on earthquake situation inChina[C].Beijing:Seismological Press,1990,50-65)
4赖锡安,等.中国大陆现今地壳运动[M].北京:地震出版社,2004.(Lai Xian,et al.Present-day crustal movement inChina comstrained[M].Beijing:Seismological Press,2004)
5谢觉民,黄立人.唐山地震前后的地壳垂直运动[J].地震地质,1987,9(3):1-19.(Xie Juemin and Huang Liren.Crustal vertical movement before and after the Tangshanearthquake[J].Seismology and Geology,1987,9(3):1-19)
6王若柏,等.华北地区地壳垂直形变场及动态演化特征[J].地震学报,1995,17(2):148-155.(Wang Ruobai,etal.Vertical crustal deformation in North China and dynamicevolution characteristics[J].Acta Seismologica Sinica,1995,17(2):148-155)
7王双绪.川西地区近期大地垂直形变场演化与地壳运动特征[J].地壳形变与地震,1992,(2):17-22(WangShuangxu.Characteristics of the evolution of recent verticaldeformation field and the crustal motion in west Sichuan[J].Crustal Deformation and Earthquake,1992,(2):17-22)
8郭良迁,黄立人.苏鲁皖地区现代构造活动性研究[J].大地测量与地球动力学,2008,(4):17-24.(Guo Liangqianand Huang Liren.On current tectonic activity in Jiangsu-Shandong-Anhui area[J].Journal of Geodesy and Geody-namics,2008,(4):17-24)
9朱凤鸣,吴戈.一九七五年海城地震[M].北京:地震出版社,1982.(Zhu Fengming and Wu Ge.Haicheng earth-quake in 1975[M].Beijing:Seismological Press,1982)
10马杏垣.中国岩石圈动力学地图集[M].北京:中国地图出版社,1989.(Ma Xingyuan.Atlas of the lithospheric dy-namics in China[M].Beijing:China Cartographic Publica-tion Press,1989)
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