Skip to main content
U.S. flag

An official website of the United States government

Using a large-n seismic array to explore the robustness of spectral estimations

October 22, 2020

Spectral analysis is widely used to estimate and refine earthquake source parameters such as source radius, seismic moment, and stress drop. This study aims to quantify the precision of the single spectra and empirical Green's function spectral ratio approach using the Large‐n Seismic Survey in Oklahoma (LASSO) array. The dense station coverage in an area of local saltwater disposal offers a unique opportunity to observe and quantify radiation pattern effects and subsequent precision of spectral estimates of small earthquakes (M < 3). The results suggest that the precision of source properties estimated from direct phase arrivals for arrays with less than 20 stations should be assumed to be not less than 30% and could be as high as 150% if less than five stations are used. Furthermore, we do not see clear evidence for, or against, a scaling of stress drop with magnitude of small earthquakes (M < 3) as observed by other studies.

Citation Information

Publication Year 2020
Title Using a large-n seismic array to explore the robustness of spectral estimations
DOI 10.1029/2020GL089342
Authors K.B. Kemna, A.F. Pena Castro, R.M. Harrington, Elizabeth S. Cochran
Publication Type Article
Publication Subtype Journal Article
Series Title Geophysical Research Letters
Series Number
Index ID 70217251
Record Source USGS Publications Warehouse
USGS Organization Earthquake Science Center

Related Content