On the feasibility and use of teleseismic P wave coda autocorrelation for mapping shallow seismic discontinuities
Date
2017
Authors
Pham, Thanh-Son
Tkalčić, Hrvoje
Journal Title
Journal ISSN
Volume Title
Publisher
Wiley Blackwell
Abstract
Seismic body waves from distant earthquakes, which propagate near vertically beneath recording stations, provide tools for imaging shallow Earth structures with high vertical resolution. The most commonly used techniques such as P and S wave receiver functions utilize mode conversions from P to S waves or vice versa to retrieve information on the gradients of elastic properties in the crust and upper mantle. Here we demonstrate the feasibility and advantage of utilizing reflection signals through an improved method of teleseismic P wave coda autocorrelation. We recover clear reflections independently on vertical and radial components, which provide complementary constraints on the subsurface structures. Field data from two stations from different geological settings are analyzed, one of which is an ice station in Antarctica and the other is a bedrock station on the Kaapvaal craton in South Africa. The results from both analyses show the feasibility of the method to unveil P and S wave reflection signals from the ice-rock interface and the Moho discontinuity. Extensive synthetic experiments are set up to corroborate our results.
Description
Keywords
Citation
Collections
Source
Journal of Geophysical Research: Solid Earth
Type
Journal article
Book Title
Entity type
Access Statement
Open Access
License Rights
DOI
10.1002/2017JB013975