[ghsc-seminars] GHSC Seminar *HYBRID* - Kathryn Materna, USGS, March 21, 2023

[Llenos, Andrea L]

Faults that slip slowly, quickly, or not at all: Understanding the spectrum of slip behavior on California’s faults from space geodesy

Speaker: Kathryn Materna
                Earthquake Science Center
                USGS
Location: HYBRID (online and in-person at 1711 Illinois St, Golden, CO, Rm 204)
                 *Non-USGS visitors welcome! Please bring a photo ID and arrive early to allow time to go through security*
Date/Time: Tuesday, March 21, 2023 10-11AM MDT
                  (We will be going out to lunch with Kathryn after the talk; feel free to join us!)

Abstract: Faults in nature are observed to slip in various modes: some faults slip continuously in slow aseismic creep, while others slip at seismic speeds in earthquakes and stay highly coupled for long periods of time in between earthquakes. However, many questions remain about this process in nature, such as the rates at which individual faults accumulate strain, and the dynamics at play when a single fault system displays multiple modes of slip over time and space. These questions are directly relevant to seismic hazard at plate boundaries and even in continental interiors. In this presentation, I investigate three case studies of faults that are accumulating tectonic strain in three different settings throughout the state of California. First, I investigate the extent of deep aseismic creep and megathrust coupling in the southernmost Cascadia Subduction Zone, estimating coupling ratios and the size of the maximum-magnitude earthquake. I then analyze the kinematics of fault slip in a geothermal setting, the Salton Trough, that deforms by both aseismic slip and regular earthquakes. Lastly, I systematically explore strain rates in Southern California, a region that accumulates strain due to high coupling on its major faults. Each example reveals insights into regional fault coupling through new compilations and analysis of geodetic data. Together, these examples underscore the value and utility of geodetic data in better understanding fault-related hazards and fault zone processes.

Bio: Kathryn Materna is a Mendenhall Postdoctoral Fellow at the U.S. Geological Survey Earthquake Science Center in Moffett Field, CA. She studies strain accumulation, faulting processes, and induced seismicity in geothermal areas using a combination of GNSS, InSAR, and other geophysical data sets. She received a Ph.D. in Earth and Planetary Sciences from UC Berkeley in 2019 and a bachelor’s degree from MIT in 2014.  At ESC, her Mendenhall research focuses primarily on deformation along the San Andreas fault system, especially around the Mendocino triple junction and the Salton Trough regions.

For questions, comments, or speaker suggestions, please contact the GHSC Seminar Committee: Andrea Llenos <allenos at usgs.gov>, Benjamin Murphy <bmurphy at usgs.gov>, Lauren Schaefer <lschaefer at usgs.gov>


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