Estimating Local and Near-Regional Velocity and Attenuation Structure from Seismic Noise
Abstract
This paper investigates the utility of computing Time-Domain Green's Functions (TDGF) to be used for estimating velocity and attenuations structure for the purposes of nuclear explosion monitoring over local and near-regional distances. Our objective is to extend and apply the methodology of deriving TDGF for propagation between two receivers by cross correlation of seismic noise and/or coda of earthquakes observed at the receivers and concentrates on the following four tasks: (1) The specific noise spectrum of the ocean microseism needs to be accounted for and compensated for in order to be able to measure group velocities across a wider bandwidth. (2) We are investigating methods to obtain spatial variations in attenuation using ambient noise. (3) Mean-phase velocity-dispersion curves are calculated for the TUCAN seismic array in Costa Rica and Nicaragua from ambient seismic noise using two independent methods: noise cross correlation and beamforming. (4) From a data set recorded by a small-scale array (~4 km aperture).
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 30, 2008
- Accession Number
- ADA487650
Entities
People
- Jian Zhang
- Karim G. Sabra
- Michael C. Fehler
- Nick Harmon
- Peter Gerstoft
- Steven R. Taylor
- William A. Kuperman
Organizations
- University of California, San Diego