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Hunt for slow slip events along the Sumatran subduction zone in a decade of continuous GPS data

AutorFeng, Lujia; Hill, Emma; Elosegui, Pedro ; Qiu, Qiang; Hermawan, Iwan; Banerjee, Paramesh; Sieh, Kerry
Fecha de publicacióndic-2015
EditorAmerican Geophysical Union
CitaciónJournal of Geophysical Research. Solid Earth 120(12): 8623-8632 (2015)
ResumenSlow slip events (SSEs) have been observed in GPS time series for many subduction zones worldwide but not in decade-long GPS time series from the Sumatran GPS Array (SuGAr). An outstanding question has been whether SSEs have simply not occurred on the Sunda megathrust or whether they have been obscured by the prodigious number of earthquakes and their ensuing postseismic deformation within the time of geodetic observation. We remove all known tectonic signals from the time series to search for evidence of SSEs. The residuals are essentially flat at the centimeter scale. To search for signals at the millimeter scale we test various filtering and visualization techniques. Despite these efforts, we conclude that it is difficult to confirm that SSEs exist at this scale using the current data, although we do see a few suspicious signals. The lack of evidence for events may reflect SSEs occurring at a magnitude, location, or timescale that renders them undetectable with the current resolution of the SuGAr, that the properties of this megathrust are not conducive to SSEs, or because the megathrust is in an active period of the earthquake cycle
Descripción10 pages, 4 figures, supporting information http://dx.doi.org/10.1002/2015JB012503.-- This work is Earth Observatory of Singapore paper number 104
Versión del editorhttp://dx.doi.org/10.1002/2015JB012503
URIhttp://hdl.handle.net/10261/131444
DOI10.1002/2015JB012503
Identificadoresdoi: 10.1002/2015JB012503
e-issn: 2169-9356
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