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Path correction using interpolated amplitude residuals: An example from central China
Author(s) -
Phillips W. Scott,
Randall George E.,
Taylor Steven R.
Publication year - 1998
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/98gl51940
Subject(s) - amplitude , seismogram , coda , magnitude (astronomy) , geodesy , geology , smoothing , lithosphere , test site , seismology , statistics , mathematics , computational physics , physics , optics , tectonics , astrophysics
To isolate effects of the laterally varying lithosphere on regional seismograms, we geographically smoothed source‐ and distance‐corrected amplitudes from 853 events recorded at station LZH in central China. This procedure was applied to P n , P g , S n and L g phases and various coda windows for eight bands between 0.5 and 8 Hz. We assume smoothing reduces effects such as source radiation, leaving an estimate of the path effect that can be used to correct data. A cross‐validation procedure showed that path corrections performed best with low‐frequency L g data, reducing variance up to 39% for 1 Hz L g , and up to 57% for 0.75 Hz P/L g ratios, compared to correction for distance alone. These corrections reduce scatter in magnitude estimates and discriminant ratios without needing to know detailed geological structure and will be important for effective test‐ban monitoring.