Study on new optimum parameters in MT repeated survey |
| |
Authors: | Yun-Lin Zhang Xiao-Ling Liu Hai-Jing An Mei Jiang Zhi-Xiong Li Yu-Lan Si and Wu-Si Zhang |
| |
Institution: | (1) Seismological Bureau of Hainan Province, 570004 Haikou, China;(2) Earthquake Research Institute of Lanzhou, State Seismological Bureau, 730000 Lanzhou, China |
| |
Abstract: | The first MT monitoring profile with initial shape both at home and abroad has been built in the northern margin of the Qinghai-Tibet Plateau. Based on MT data observed before and after the eight earthquakes of M=5-7 from 1988 to 1992,a new parameter-mean resistivity has been introduced. The results show that indicates not only the major feature of decreasing-increasing and recovering to notmal value, but also synchronism of phase or the variation in a large area, "lead or delay" among different small areas and the amplitude decreasing with the increase of the distance from the epicenter. Two characters mentioned above might correspond to reginal field precursor of the tectonic generating earthquake and field precursor of the tectonic kinematics. This paper analyses the errors of observed data and the cause of variation. The MT profile optimum parameter system consists of parameter,apparent resistivity,twisting degree and the principal-axis azimuth which might provide quantitative criterion for the physical prooes of the great destructive earthquake and moderate and short-term earthquake prediction. |
| |
Keywords: | magnetotellurics mean resistivity prospecting depth MT optimum parameter MT monitoring optimum depth |
本文献已被 CNKI SpringerLink 等数据库收录! |
|