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3D survey details dangerous megathrust fault off Costa Rican coast

3D survey details dangerous megathrust fault off Costa Rican coast

Science
Feb. 12 (UPI) -- Scientists have a better understanding of the dynamics of a dangerous megafault off the coast of Costa Rica, thanks to a new survey by researchers at the University of California, Santa Cruz.The survey yielded detailed 3D images of the Costa Rican subduction zone, where the Cocos plate sinks and slides under the Caribbean plate.Unlike similar megathrust faults, the Costa Rican fault features unusual earthquakes, patchy in their distribution. The ruptures rarely spread to shallow depths. Scientists believe the fault's odd behavior is explained by its varied textures -- corrugated patterns created by subduction activity."Our new imagery shows large variability in the conditions along the megathrust, which may be linked to a number of earthquake phenomena we observe in the re...