Abstract
A temporal and spatial change of codaQ −1 associated with the occurrence of the North Palm Springs earthquake of July 8, 1986 was studied by using 242 small local earthquakes in the vicinity of the mainshock. We found that the codaQ −1 of earthquakes which occurred before the mainshock was significantly higher than that of the aftershocks in the mainshock area while the codaQ −1 for the surrounding area remained almost constant throughout 1986. CodaQ −1 was determined separately for the lapse time windows of 10 to 20 sec. and 15 to 40 sec. for the period from 1981 to 1987. The result for the time window 10 to 20 sec. showed a peak in codaQ −1 before the time of mainshock at all frequencies. The peak appeared earlier at lower frequencies. There was no significant change in codaQ −1 for the time window 15 to 40 sec., probably because the change was restricted to a small area.
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Su, F., Aki, K. Temporal and spatial variation on codaQ −1 associated with the North Palm Springs earthquake of July 8, 1986. PAGEOPH 133, 23–52 (1990). https://doi.org/10.1007/BF00876701
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DOI: https://doi.org/10.1007/BF00876701