Scaling relations for seismic cycles on mid-ocean ridge transform faults

Details Scaling relations for seismic cycles on mid-ocean ridge transform faults Scaling relations for seismic cycles on mid-ocean ridge transform faults

Nov 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009georl..3621301b&link_type=abstract

Geophysical Research Letters, Volume 36, Issue 21, CiteID L21301

Physics

Geophysics

Marine Geology And Geophysics: Oceanic Transform And Fracture Zone Processes, Seismology: Earthquake Interaction, Forecasting, And Prediction (1217, 1242), Seismology: Seismicity And Tectonics (1207, 1217, 1240, 1242), Seismology: Transform Faults

Scientific paper

Mid-ocean ridge transform faults (RTFs) have thermal structures that vary systematically with tectonic parameters, resulting in predictable seismic characteristics and clear seismic cycles. We develop a scaling relation for repeat time, tR, of the largest expected earthquake, MC: tR = μ-1Δσ2/3CMc1/3AT1/4V-1, where μ is the shear modulus, Δσ is the stress drop, CMc is a constant, AT is the area above 600°C, and V is the slip rate. We identify repeating MC earthquakes by measuring differential arrival times of first orbit Rayleigh waves to determine centroid offsets between pairs of events. Comparing our observations of tR (5-14 years for earthquakes on Gofar and Blanco RTFs) with predictions from our scaling relation, we can constrain RTF stress drops. Specific tests of this scaling relation are proposed for earthquakes on Blanco, Gofar, Discovery, and Clipperton RTFs, which are all expected to have large ruptures in the next few years.

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