Seismogenic Zone Structure and Behavior: Susan Schwartz

northern Costa Rica seismogenic zone Subduction is a fundamental geological process generating and modifying continental crust and associated with severe natural hazards including earthquakes, volcanoes, and tsunami.The portion of a subduction zone capable of generating earthquakes (termed the seismogenic zone) is fairly restricted in depth but is responsible for releasing ~90% of the earth's seismic energy. Global observations at subduction zones reveal a large range in seismogenic behavior with variations in maximum earthquake magnitude, repeat time, and slip distributions. My research focuses on fundamental processes controlling earthquake occurrence and the large variations in earthquake behavior at regional scale. Specifically, with various collaborators, I have been involved in 3 large amphibious experiments that collected seismic and geodetic data on land and at sea to investigate the mechanical behavior of of the plate interface at the Hikurangi, New Zealand (Hikurangi Ocean Bottom Investigation of Tremor and Slow Slip or HOBITSS experiment), Cascadia (Cascadia Initiative or CI experiment) and Alaska (Alaska Amphibious Community Seismic Experiment or AACSE) seismogenic zones. Together with ongoing work at the northern Costa Rica convergent margin, this research seeks to understand the spatiotemporal relationship between seismic (earthquake) and aseismic (slow slip) slip on the megathrust and what controls these different mechanical behaviors.