Inversion Analysis Of Data Research Articles

Detection of Dysplasia Geological Structure of Highway Tunnel Based on High-Density Electric Method

Before the engineering design and construction of highway tunnels, it is necessary to carry out detailed investigations on the geographical layer distribution, dysplasia structural conditions, groundwater and other geological conditions in the engineering region, which can provide security for the engineering construction and service of the project. High-density electric method is an array type rapid exploration method. It has the advantages of measuring points easily setting, automatic data acquisition, rich information interpretation, short survey period and low cost. After more than 30 years of development and application, it is widely used and effective in engineering survey field. With the using AGI high-density resistivity imaging system, the geological conditions and poor structures of the Pine Mountain tunnel project of the 108 National Highway in the Jingxi Mountainous Area were investigated and implemented, and a variety of measuring devices were selected for comparative testing and data inversion analysis. By comparing the test results with the geological data and the situation on the site, it is inferred that more accurate information on stratigraphic structure and abnormal body distribution can make up for the serious shortage of engineering geological drilling points.

Slow slip in the focal region of the anticipated Tokai earthquake following the seismo-volcanic event in the northern Izu Islands in 2000

Abstract Transient crustal deformation occurred in the regions of Kanto and Tokai during the seismo-volcanic event in the northern Izu Islands in 2000. In our investigation of the observed deformation, we constructed an optimum-source model of the event between Miyake and Kozu Islands. We then made an inversion analysis of the differences between the observed displacement field and the calculated displacement field from the optimum model, assuming that the differences were caused by the changes in the interplate coupling beneath the Tokai region. From the inversion analysis of data for each of three-month periods, May to August, June to September, and July to October, we found decreased interplate coupling in the early stages of the 2000 event. In the first stage, either a slow slip or a temporary suspension of the plate subduction occurred in the focal region of the anticipated Tokai earthquake. The area then extended to the west and, finally, a slow slip exceeded the secular convergence velocity on the plate interface near Lake Hamana in the fall of 2000. We believe this ongoing slow slip began in August or early September 2000.