Observed correlations between aftershock spatial distribution and earthquake fault lengths

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Abstract

We observe the spatial distributions of the magnitude of aftershocks following the six earthquakes of focal depth shallower than 20 km with magnitude more than 5.0 from 1983 to 1987 in Japan. The upper limit of the aftershock magnitude is examined as a function of the distance from mainshock hypocentre. The observed spatial distributions of the upper limit are bimodal, with a tendency of the upper limit to decrease as the distance from mainshock hypocentre increases. Moreover, we observe the correlations between the aftershock spatial distribution and earthquake fault length. We focus on the largest aftershocks in each of two aftershock sequences constituting the bimodal distribution. The distances of the two largest aftershocks from the mainshock hypocentre are equal to the fault lengths of shallow earthquakes in Japan and to the maximum earthquake fault lengths.

Original languageEnglish
Pages (from-to)312-316
Number of pages5
JournalTerra Nova
Volume12
Issue number6
DOIs
Publication statusPublished - 2000 Dec 1

ASJC Scopus subject areas

  • Geology

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