A slow slip event in the south central Alaska Subduction Zone and related seismicity anomaly
Figure S1: The distribution of wavelet translations used at the different spatial scales in this study and examples of the wavelets for the j =0, −1, −2, −3 scales at a particular translation. (144.0Kb)
Figure S2: Secular velocity estimated based the whole time series and the result of NSF at station SELD. (196.7Kb)
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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 35 km 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.
Author Posting. © American Geophysical Union, 2012. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Geophysical Research Letters 39 (2012): L15309, doi:10.1029/2012GL052351.
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