DOI: 10.5061/dryad.tx95x69wn
title: Modeling results of seismoelectric signals excited by a weight-drop source

description: This dataset contains data of all figures in a submitted manuscript titled
 "Refining higher modes of Rayleigh waves using seismoelectric signals
 excited by a weight-drop source: study from numerical simulation aspect
 " to Journal of Geophysical Research: Solid Earth. Effective
 extraction of higher mode dispersion information has been a research
 hotspot in the study of surface waves. In this study, we introduce a novel
 approach of refining Rayleigh wave higher modes by using seismoelectric
 signals, namely, electromagnetic (EM) signals originating from
 seismoelectric conversion. Adopting a weight-drop source, we simulate
 seismic and EM signals for a homogeneous half-space and six multi-layered
 porous models (see data for Figure 1). An extended version of the
 frequency-Bessel transform method is introduced to extract dispersion
 information from seismic and EM signals. Using a homogeneous
 water-saturated half-space porous model, we firstly investigate the
 dispersion characteristic of seismoelectric signals in the simplest case
 and also give the physical explanation for seismoelectric signals induced
 by both seismic surface waves and body waves (see data for Figure 2).
 Then, we consider two-layer and four-layer half-space porous models whose
 top layer possesses the zero coupling coefficient to further investigate
 the dispersion characteristic of evanescent seismoelectric waves (see data
 for Figures 3-9). We find, in comparison with seismic waves, the
 evanescent seismoelectric waves contain extra Rayleigh wave dispersion
 information involving higher modes and different frequency ranges. To
 investigate the effect of the water saturation of the partially saturated
 porous medium, we design another four-layer half-space porous model whose
 top layer has a water saturation greater than the residual water
 saturation and three thirteen-layer half-space porous models with
 different variation range of water saturations for the porous media above
 the water table (see data for Figures 10 and 11). Besides, we also discuss
 some issues worthy of practical application and further study, including
 spatial aliasing analysis and the effects of electrode distance, electric
 background noise, salinity, and fluid viscosity on the electric fields
 (see data for Figures 12-17). Generally speaking, our study suggests
 Rayleigh wave dispersion information with abundant higher modes and good
 frequency-range coverage can be obtained by using seismic and
 seismoelectric signals together due to their complementarity. It has the
 potential to significantly reduce the nonuniqueness and to increase the
 stability and accuracy in the dispersion curve inversion of Rayleigh
 waves.
description: Dataset from: Yuan, S., Ren, H., Huang, Q., Zheng, X.-Z., Yang,
 Z., He, Z., Zhang, W., & Chen, X. (2021). Refining higher modes of
 Rayleigh waves using seismoelectric signals excited by a weight-drop
 source: study from numerical simulation aspect. Journal of Geophysical
 Research: Solid Earth. A README file accompanying the dataset has been provided to introduce data information on all figures in this article in detail.