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http://hdl.handle.net/2122/2918
Authors: | Mayeda, K.* Malagnini, L.* Walter, W.* |
Title: | Evidence for departure in self-similarity: a new spectral ratio method using narrowband coda envelopes | Journal: | Geophysical Research Letters | Series/Report no.: | / 34 (2007) | Publisher: | American Geophysical Union | Issue Date: | 2007 | DOI: | 10.1029/2007GL030041 | Keywords: | non-self-similarity | Subject Classification: | 04. Solid Earth::04.06. Seismology::04.06.03. Earthquake source and dynamics | Abstract: | The use of local and regional S-wave coda is shown to provide stable amplitude ratios that better constrains source differences between event pairs. We first compared amplitude ratio performance between local and near regional S and coda waves in the San Francisco Bay region for moderate-sized events, then applied the coda spectral ratio method to the 1999 Hector Mine mainshock and its larger aftershocks. We find (1) average amplitude ratio standard deviations using coda are ~0.05 to 0.12, roughly a factor of 3 smaller than direct S-waves for 0.2 < f < 15.0 Hz; (2) coda spectral ratios for the Mw 7.0 Hector Mine earthquake and its aftershocks show a clear departure from self-similarity, consistent with other studies using the same datasets; and (3) event-pairs (Green’s function and target events) can be separated by ~25 km for coda amplitudes without any appreciable degradation, in sharp contrast to direct waves. |
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