1920年海原地震中的最大水平位移及西华山北缘断裂地震重复率的估计

地震地质 ›› 1983, Vol. 5 ›› Issue (4): 29-38.

1920年海原地震中的最大水平位移及西华山北缘断裂地震重复率的估计

宋方敏¹, 朱世龙¹, 汪一鹏¹, 邓起东¹, 张维歧²

1. 国家地震局地质研究所;
2. 宁夏回族自治区地震局

收稿日期:1983-03-31 出版日期:1983-12-01 发布日期:2009-11-25

THE MAXIMUM HORIZONTAL DISPLACEMENT IN THE HAIYUAN EARTHQUAKE OF 1920 AND THE ESTIMATION OF THE EARTHQUAKE RECURRENCE ALONG THE NORTH ERN MARGINAL FAULT OF THE XIHUASHAN

Song Fangmin¹, Zhu Shilong¹, Wang Yipeng¹, Deng Qidong¹, Zhang Weiqi²

1. Institute of Geology, State Seismological Bureau;
2. Seismological Bureau of Ningxia Autonomous Region

Received:1983-03-31 Online:1983-12-01 Published:2009-11-25

摘要/Abstract

摘要： 通过对海原地震震中区(唐家坡村西—乱堆子东)的大比例尺实测填图,获得了地震断层带上各类冲沟左旋位移的若干数据。规模越大的冲沟位移数据也越大。其中73条小冲沟和田埂的位移均为1920年8.5级大震一次造成,最大位移达10米。从杨户章沟到古墩子之间的西华山北缘断裂,各类冲沟位移量都较大。根据发育了两级阶地的冲沟的平均位移量、位移开始的时间、大震造成的最大位移及平均位移,计算了该段断层的滑动速率和8.5级大地震的重复率。

Abstract: Through the mapping on the large scale and measurement in the epicentral area of the Haiyuan earthquake, left-lateral displacements of the gullies of various kinds which cross the earthquake fault are found. The data show that the larger the gullies are, the larger the horizontal displacements. Among these displacements, there are 73 offsets of small gullies and farming banks which were formed in the earthquake of 1920 (M= 8.5) with the maximum of about 10m.Displacements of various gullies are relatively large between the Yanghuzhang valley and the Gudunzi valley.On the basis of displacements of gullies on the second terrace, initial time of offseting as well as the average and maximal displacements associated with a great earthquake, we have calculated the slip rate and seismic recurrence for 8.5 earthquakes along the studied fault.

宋方敏, 朱世龙, 汪一鹏, 邓起东, 张维歧. 1920年海原地震中的最大水平位移及西华山北缘断裂地震重复率的估计[J]. 地震地质, 1983, 5(4): 29-38.

Song Fangmin, Zhu Shilong, Wang Yipeng, Deng Qidong, Zhang Weiqi. THE MAXIMUM HORIZONTAL DISPLACEMENT IN THE HAIYUAN EARTHQUAKE OF 1920 AND THE ESTIMATION OF THE EARTHQUAKE RECURRENCE ALONG THE NORTH ERN MARGINAL FAULT OF THE XIHUASHAN[J]. SEISMOLOGY AND GEOLOGY, 1983, 5(4): 29-38.