Interface locking along the subduction megathrust from b-value mapping near Nicoya Peninsula, Costa Rica

Details Interface locking along the subduction megathrust from b-value mapping near Nicoya Peninsula, Costa Rica Interface locking along the subduction megathrust from b-value mapping near Nicoya Peninsula, Costa Rica

Jan 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008georl..3501301g&link_type=abstract

Geophysical Research Letters, Volume 35, Issue 1, CiteID L01301

Physics

7

Seismology: Earthquake Dynamics (1242), Seismology: Subduction Zones (1207, 1219, 1240), Seismology: Earthquake Interaction, Forecasting, And Prediction (1217, 1242)

Scientific paper

To understand controlling factors for seismogenesis and strain-accumulation in subduction megathrusts we examine seismicity patterns across Nicoya, Costa Rica, to determine the overall and spatial variability in the earthquake frequency-magnitude distribution along the interface. The mean reduction in earthquake activity with magnitude, b-value, is higher (1.06) than global subduction zone averages (0.6-0.8), suggesting the interface here is weakly coupled. Strong spatial variations in b are anticorrelated (-0.53) with geodetic estimates of interface locking of E. Norabuena et al. (2004). High b prevails in two regions, including the subducted Fisher seamount chain. A broad zone of reduced b is observed at and offshore the central Nicoya coast; extending towards an imaged locked patch. These results suggest b-value studies may be useful in identifying regions of increased interface locking in subduction zones, which may indicate regions capable of large slip in future large earthquakes.

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