Year: 2016
Type: conference-paper
Abstract: 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.
Authors: Wenhui Zhang, Weijun Jin, Weihang Huang, Rui Cui
Language: English
Topic: Seismic Waves and Analysis
Subfield: Geophysics
Field: Earth and Planetary Sciences
Domain: Physical Sciences
Open Access status: hybrid
OpenAlex ID: W2469375367