Predicting the geodetic signature of Mw ≥ 8 slow slip events

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Abstract

Elastic dislocation models of geodetic measurements above subduction zones have led to the identification of Mw ≈ 6.0-7.2 slow slip events (SSEs) that release elastic strain over periods of days to months, but great (Mw ≥ 8) SSEs have remained unidentified. We extrapolate observations of SSE duration and slip magnitude to show that slip velocity decreases with event magnitude and predict that the slip velocity of M w ≥ 8 SSEs is ≤50 mm/yr. The slip velocity for great SSEs may never exceed the plate convergence rate and thus never produce a reversal in trench perpendicular motion. Instead, geodetically constrained estimates of apparent partial elastic coupling on subduction zone interfaces worldwide may be direct observations of ongoing Mw ≥ 8 silent earthquakes with durations of decades to centuries. © 2009 by the American Geophysical Union.

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Meade, B. J., & Loveless, J. P. (2009). Predicting the geodetic signature of Mw ≥ 8 slow slip events. Geophysical Research Letters, 36(1). https://doi.org/10.1029/2008GL036364

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