Influences on the location of repeating earthquakes determined from a and b value imaging

Masashi Kawamura, Kate Huihsuan Chen

    Research output: Contribution to journalArticlepeer-review

    3 Citations (Scopus)

    Abstract

    To explore where earthquakes tend to recur, we statistically investigated repeating earthquake catalogs and background seismicity from different regions (Parkfield, Hayward, Calaveras, and Chihshang Faults). We show that the location of repeating earthquakes can be mapped using the spatial distribution of the seismic a and b values obtained from the background seismicity. Molchan's error diagram statistically confirmed that repeating earthquakes occur within areas with high a values (2.8–3.8) and high b values (0.9–1.1) on both strike-slip and thrust fault segments. However, no significant association held true for fault segments with more complicated geometry or for wider areas with a complex fault network. The productivity of small earthquakes responsible for high a and b values may thus be the most important factor controlling the location of repeating earthquakes. We inferred that the location of high creep rate in planar/listric fault structures might be indicated by a values of ~3 and b values of ~1.

    Original languageEnglish
    Pages (from-to)6675-6682
    Number of pages8
    JournalGeophysical Research Letters
    Volume44
    Issue number13
    DOIs
    Publication statusPublished - 2017 Jul 16

    Keywords

    • fault creep
    • frequency-magnitude distribution
    • repeating earthquakes
    • seismicity

    ASJC Scopus subject areas

    • Geophysics
    • Earth and Planetary Sciences(all)

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