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<div style="" class="ContentPasted0"><span style="font-family: Calibri, Helvetica, sans-serif; font-size: 14pt;"><b>Faults that slip slowly, quickly, or not at all: Understanding the spectrum of slip behavior on California’s faults from space geodesy</b></span><br>
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<div style=""><font color="#201f1e" face="Calibri, sans-serif"><span style="font-size: 12pt; font-family: Calibri, Helvetica, sans-serif;"><b>Speaker:</b></span><span style="font-size: 12pt; font-family: Calibri, Helvetica, sans-serif;"> Kathryn Materna</span></font></div>
<div style=""><font color="#201f1e" face="Calibri, sans-serif"><span style="font-size: 12pt; font-family: Calibri, Helvetica, sans-serif;"> Earthquake Science Center</span></font></div>
<div style=""><font color="#201f1e" face="Calibri, sans-serif"><span style="font-size: 12pt; font-family: Calibri, Helvetica, sans-serif;"> USGS</span></font></div>
<div style=""><font color="#201f1e" face="Segoe UI, Segoe UI Web (West European), Helvetica Neue, sans-serif"><span style="font-size: 16px; font-family: Calibri, Helvetica, sans-serif;"><b>Location:
</b></span><span style="font-size: 16px; font-family: Calibri, Helvetica, sans-serif;">HYBRID (online and in-person at 1711 Illinois St, Golden, CO, Rm 204)</span></font></div>
<div style=""><font color="#201f1e" face="Segoe UI, Segoe UI Web (West European), Helvetica Neue, sans-serif"><span style="font-size: 16px; font-family: Calibri, Helvetica, sans-serif;"> *Non-USGS visitors welcome! Please bring a photo ID and
arrive early to allow time to go through security*</span></font></div>
<div style=""><font color="#201f1e" face="Segoe UI, Segoe UI Web (West European), Helvetica Neue, sans-serif"><span style="font-size: 16px; font-family: Calibri, Helvetica, sans-serif;"><b>Date/Time:
</b></span><span style="font-size: 16px; font-family: Calibri, Helvetica, sans-serif;">Tuesday, March 21, 2023 10-11AM MDT</span></font></div>
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</span><span style="font-size: 16px; font-family: Calibri, Helvetica, sans-serif;">(We will be going out to lunch with Kathryn after the talk; feel free to join us!)</span></font></div>
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<div style=""><font color="#201f1e" face="Segoe UI, Segoe UI Web (West European), Helvetica Neue, sans-serif"><span style="font-size: 16px;"><span class="ContentPasted1" style="font-family: Calibri, Helvetica, sans-serif;"><b>Abstract: </b></span><span class="ContentPasted1" style="font-family: Calibri, Helvetica, sans-serif;">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.
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<div style=""><font color="#201f1e"><span style="font-size: 16px;"><span class="ContentPasted2" style="font-family: Calibri, Helvetica, sans-serif;"><b>Bio: </b></span><span class="ContentPasted2" style="font-family: Calibri, Helvetica, sans-serif;">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.</span></span></font></div>
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<div style=""><font color="#201f1e" face="Calibri, sans-serif"><span style="font-size: 12pt; color: rgb(102, 102, 102);">For questions, comments, or speaker suggestions, please contact the </span></font><b style="color:inherit; font-family:inherit; font-size:12pt; font-style:inherit; font-variant-ligatures:inherit; font-variant-caps:inherit"><span style="font-weight:400"><span style="font-size: 12pt; font-family: Calibri, sans-serif; color: rgb(102, 102, 102);">GHSC
Seminar Committee: Andrea Llenos <allenos@usgs.gov>, Benjamin Murphy <bmurphy@usgs.gov>, Lauren Schaefer <lschaefer@usgs.gov></span></span></b></div>
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