Publication Date:
2017-04-04
Description:
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.
Description:
Published
Description:
L11303
Description:
3.1. Fisica dei terremoti
Description:
JCR Journal
Description:
reserved
Keywords:
non-self-similarity
;
04. Solid Earth::04.06. Seismology::04.06.03. Earthquake source and dynamics
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
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