W phase source inversion using high-rate regional GPS data for large earthquakes

S. Riquelme*, F. Bravo, D. Melgar, R. Benavente, J. Geng, S. Barrientos, J. Campos

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    27 Citations (Scopus)

    Abstract

    W phase moment tensor inversion has proven to be a reliable method for rapid characterization of large earthquakes. For global purposes it is used at the United States Geological Survey, Pacific Tsunami Warning Center, and Institut de Physique du Globe de Strasbourg. These implementations provide moment tensors within 30-60 min after the origin time of moderate and large worldwide earthquakes. Currently, the method relies on broadband seismometers, which clip in the near field. To ameliorate this, we extend the algorithm to regional records from high-rate GPS data and retrospectively apply it to six large earthquakes that occurred in the past 5 years in areas with relatively dense station coverage. These events show that the solutions could potentially be available 4-5 min from origin time. Continuously improving GPS station availability and real-time positioning solutions will provide significant enhancements to the algorithm.

    Original languageEnglish
    Pages (from-to)3178-3185
    Number of pages8
    JournalGeophysical Research Letters
    Volume43
    Issue number7
    DOIs
    Publication statusPublished - 16 Apr 2016

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