A slow slip event in the south central Alaska Subduction Zone and related seismicity anomaly

Meng Wei, Jeffrey J. McGuire, Eliza Richardson

Research output: Contribution to journalArticle

29 Scopus citations

Abstract

We detected a slow slip event in the south central Alaska Subduction Zone by analyzing continuous GPS data from the Plate Boundary Observatory (PBO) network. The slow slip event started in early 2010 at a depth of 35km beneath the Cook Inlet, near the down-dip end of the locked zone, and is ongoing as of November 2011 with an accumulated magnitude of Mw 6.9. Analysis of the earthquake catalog in the same area using the stochastic Epidemic Type Aftershock Sequence model (ETAS) shows a small but detectable seismicity increase during the slow slip event. We also find a change in seismicity rate around 1998, that may suggest an earlier slow slip event in the same region. Slow slip events in Alaska appear more widespread than previously thought but have remained undetected due to their long durations, the time intervals between them, and the limited time records from the continuous GPS.

Original languageEnglish (US)
Article numberL15309
JournalGeophysical Research Letters
Volume39
Issue number15
DOIs
StatePublished - Aug 16 2012

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Earth and Planetary Sciences(all)

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