Department of Geophysics - Heiland Lecture Series
Thursday, April 6, 2017 4:00 p.m.
"Near-surface Characterization with Multicomponent Rayleigh Wave Data"
Dr. Dylan Mikesell, Assistant Professor of Geosciences, Boise State University
Seismic surface waves are commonly used to characterize elastic parameter distributions and 1D, 2D and 3D structures in the near-surface. Recent advances in multicomponent sensors and land-streamer technology now enables us to rapidly collect all three components of particle motion. In addition, new processing techniques that utilize the ambient seismic wavefield have been developed that enable characterization of the near surface without the need for active sources. In this presentation I will discuss ongoing research in the Environmental Seismology Laboratory at Boise State University related to near-surface characterization with multiple component Rayleigh waves from both active and passive sources. I will discuss the benefits of multicomponent wavefields for both data estimation and data inversion processes. We will look at multicomponent cross correlations of the ambient seismic field; we will investigate Rayleigh wave overtone isolation using particle motion filters; and we will look at the improvement of active source dispersion curve inversion when we incorporate radial component data in form of horizontal-to-vertical motion ratios. Finally we will consider potential applications for this type of analysis and look at future directions.