IGPP is pleased to invite you to join its Winter 2022 Seminar Series presentation featuring Oregon State University's Pieter Share. Dr. Share's talk, "The San Andreas fault system through the Salton Trough: Insights on structure from multi-scale geophysics" will be available via Zoom on Tuesday, January 4, 2022, starting at 12:00pm. Zoom. Password: 2022
Date: Tuesday, January 4, 2022
Time: 12:00 pm, Pacific Time
Note: This meeting will be recorded. Please make sure that you are comfortable with this before registering.
Abstract: The Salton Trough is an exemplary case of the confluence of all three plate tectonic margin types. It comprises the southern San Andreas fault (SSAF, transform) system interrupted by localized incipient rifting (divergent) and abutted to the west by the Peninsular Ranges, a remnant of Farallon slab subduction (fossil convergence). All these systems contribute to a region of complex structure and strain and play key roles in the potential for destructive earthquakes and volcanic activity in the area. In this seminar, I help untangle some of these complexities using a variety of geophysical tools aimed at multi-scale features of major faults such as the seismically active San Jacinto fault zone and relatively aseismic SSAF. The employed tools include, but are not limited to, seismic tomography, electromagnetic imaging, seismicity and large-N array analyses and synthesis with geologic and geodetic data. Combined, these reveal variable fault damage zone architectures, deep fault geometries and bimaterial properties, rock porosities and fluid presence and brittle-ductile behavior, all baked into the high heat flow Salton Trough regime. These multi-scale properties play key roles in the potential and physics of large earthquake ruptures and in estimating the subsequent ground shaking.