Soil parameters deduced by refraction microtremor method

摘要：

　　Soil parameters have important impacts on the response to earthquake damage.Refraction microtremor (REMI) method is of practical significance to determine the soil thickness and velocity structure of the site.The REMI method acquires data by the conventional refraction seismic equipment, which makes use of ambient seismic field as the source.Transformation from the time-space domain to the slowness-frequency domain will be carried out in the REMI method to extract the dispersion curve by means of the tau-p transformation and the Fourier transformation.Different from the surface wave exploration of active source, the soil structure will be achieved in the greater depth by the dispersion curves inversion.Refraction microtremor method uses the conventional seismic recording instruments during the progress of seismic data acquisition.It takes about 40s in one acquisition, which is a relatively short cycle time.This is an available and high efficiency way to collect seismic data.REMI method extracted dispersion curve from P-F domain.Because the linear slowness is corresponding to the nonlinear velocity of surface wave, the change of velocity is much more obvious.As a result, it is easier to distinguish primary order and high order dispersion curves on the energy spectrum diagram.Soil structure can be obtained from the inversion progress.Because of natural vibration wave field, such as cars, trains and planes, REMI method has lower frequency characteristics, which makes REMI method having a greater exploration depth, generally reaching above 100 m.

关键词： Transient electromagnetic method Three-dimensional forward modeling Direct time-domain by vector finite element mothed Ramp time REMI soil parameters tau-p transformation slowness-frequency domain

作者: Wenhui Zhang Weijun Jin Weihang Huang Rui Cui

作者单位: Institute of Geology and Geophysics, Chinese Academy of Science, Beijing, China Schlumberger Technology Services (Beijing) Ltd, Beijing,China

会议类型: 国际会议

会议名称: The 7th International Conference on Environmental and Engineering Geophysics & Summit Forum of Chinese Academy of Engineering on Engineering Science and Technology (ICEEG 2016)(第七届环境与工程地球物理学国际会议)

会议地点: 北京

会议语种:英文

页码: 85-87

在线出版日期: 2016-06-27（万方平台首次上网日期，不代表论文的发表时间）