唐山地震前后的水平形变
HORIZONTAL DEFORMATION BEFORE AND AFTER THE TANGSHAN EARTHQUAKE OF 1976
-
摘要: 本文运用分块均匀介质模型,研究了唐山地区从1954年以来的七期三角(边)测量资料,对于唐山地震前、后的水平形变得到一些新的认识,即在1964——1971年间,唐山菱形块体有向北北东方向的运动,块体內部则有某种程度的挤压应变积累。唐山地震断层在这一时期至少在浅部保持闭锁状态。由于测量精度的限制,未能得到可靠的震后形变信息,但根据震后一年内的两次测量得到的可靠性不高的结果推测,震后一年內的调整时期,唐山地震断层两侧的相对运动可能与震时相反,但量值很小。目前唐山地区没有明显的形变。Abstract: With the so-called model of 'Homogeneous Separate Blocks', data from seven thimes of triangulation or trilateration since 1954 have been analysed in this paper to study the rock deformation before and after the Tangshan earthquake of 1976.Some new finding is obtained as follows:1) Between 1964 and 1971 the Tangshan rhomb block moved towards NNE.2) Compressive strain accumulated within the rhomb block.3) At least in the shallow part of the crust the seismogenic fault of the Tangshan earthquake was locked before the quake.So far, these characteristics might be the relatively reliable information about horizontal rock deformation in a large area before the quake.Limited by the accuracy of existing observations, no remarkable deformation was detected after the quake According to the not so reliable results obtained from two measurements carried out within one year after th quake it might be inferred that in the adjusting period lasting for one year after the quake the relative motion between the two sides of the seismic fault might be contrary to that during the seismic event but much smaller in extent. At present no significant deformation can be detected in the Tangshan area.
-
-
[1] 陈运泰、黄立人、林邦慧、刘妙龙、王新华,用大地测量资料反演的1976年店山地震的位错模式,地球物理学报,1979, 22, 201——206,
[2] 黄立人,用广义逆法分析唐山地震的水平位移场及其与经典方法的比较,地壳形变与地震,1981, 1, 3, 1——12,
[3] 黄立人,唐山地震的水平位移场及无震蠕滑,地震科学研究,1981, 5, 1——10.
[4] 一九七六年唐山地震编辑组,一九七六年唐山地震,1982,地震出版社.
[5] Rao, C.R Estimation of variance and covariance components——MINQUE theory, Journal of Multivariate Analysis, 1971, 1, 257——275.
[6] 谢觉民、黄立人,唐山地震前后的垂直形变,地震地质,1987, 9, 3, 1——19[1] 陈运泰、黄立人、林邦慧、刘妙龙、王新华,用大地测量资料反演的1976年店山地震的位错模式,地球物理学报,1979, 22, 201——206,
[2] 黄立人,用广义逆法分析唐山地震的水平位移场及其与经典方法的比较,地壳形变与地震,1981, 1, 3, 1——12,
[3] 黄立人,唐山地震的水平位移场及无震蠕滑,地震科学研究,1981, 5, 1——10.
[4] 一九七六年唐山地震编辑组,一九七六年唐山地震,1982,地震出版社.
[5] Rao, C.R Estimation of variance and covariance components——MINQUE theory, Journal of Multivariate Analysis, 1971, 1, 257——275.
[6] 谢觉民、黄立人,唐山地震前后的垂直形变,地震地质,1987, 9, 3, 1——19
计量
- 文章访问数: 988
- HTML全文浏览量: 29
- PDF下载量: 104
下载:
