Detection of a slow slip event from small signal in GPS data

Details Detection of a slow slip event from small signal in GPS data Detection of a slow slip event from small signal in GPS data

Mar 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004georl..3105606s&link_type=abstract

Geophysical Research Letters, Volume 31, Issue 5, CiteID L05606

Physics

2

Geodesy And Gravity: Crustal Movements-Interplate (8155), Geodesy And Gravity: Rheology Of The Lithosphere And Mantle (8160), Geodesy And Gravity: Seismic Deformations (7205), Seismology: Seismic Hazard Assessment And Prediction, Seismology: Seismicity And Seismotectonics

Scientific paper

By correcting for seasonal noise contained in GPS data, we are able to detect small but compelling post-seismic deformation following a medium-sized interplate earthquake (2001 August 14, MW 6.4) that occurred off the Pacific coast of northern Honshu, Japan. Its decaying-time constants are similar among the stations with an average of 2.2 months. We inverted for the slip distribution, assuming that post-seismic deformation was due to a slow slip near the main shock fault. Slow slip spreads mainly over the northern periphery of the northern asperity of the 1968 Tokachi-Oki earthquake (MW 8.2) that has been considered a seismic gap since 1994. The seismic moment of the slow slip is about three times greater (MW 6.7) than that of the co-seismic slip. The present case suggests that the post-seismic slow-slip is common not only for the large earthquakes but also for relatively small interplate earthquakes in this region.

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