1812年3月8日新疆尼勒克8级大震

THE NILKE GREAT EARTHQUAKE(M=8.0, MARCH 8,1812, XINJIANG)

摘要:

1812年3月8日新疆尼勒克县发生的8级大震造成了极强烈的地表形变,产生了长达65公里的地震断裂带,其垂直位移可达10米,右旋水平位移在1.5米以上。极震区有多处构造塌陷、滑坡和崩塌,巨型塌陷的面积达2平方公里,滑坡体后缘最宽可达2公里,震中烈度110度强。
本文根据现场考察及对航片的研究,结合历史记载勾绘了这次地震的烈度等震线,对地震的震级、震中位置、震源深度、地震矩、应力降和震源机制解等进行了计算和讨论,并对发震的地质构造背景进行了初步的探讨。

Abstract:

The earthquake of M=8.0 in the Nilke county,Xinjiang,on March 8, 1812,caused the violent deformation of the earth surface and produced a zone of the seismical fault about 65 km long.Within the zone,the maxim-um vertical offset measured is 10 m and the right-lateral offset more 1.5m There are also many structural collapses,landslips eboulements in the ma-gistoseismic area where the largest collapse is about 2km²,the widest back margin of landslip about 2km long,and the epicenter intensity over 11.
In this paper,based on the field investigation,the data from the his-torical records and the interpretation of aerial photographs,we not only have plotted the isoseismic map but had a discussion and calculation about the magnititude of the earthquake,the epicentral location,the source depth,the seismic moment,the stress drop and the solution of focul me-chanism of the Nilke earthquake.Furthermore we have made preliminary research on the seismological background of the Nilke earthquake