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<span style="font-size: 14pt;"><b>Fault Mechanics in the Roots of the San Andreas Fault through Focal Mechanisms of Low-Frequency Earthquakes</b></span><b><o:p class="ContentPasted0"><span style="font-size: 14pt;"> </span></o:p></b></p>
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<b>Speaker: </b>Naofumi Aso</p>
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                 Earth and Planetary Sciences</p>
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                 Tokyo Institute of Technology</p>
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<b>Location: </b>HYBRID (online and in-person at 1711 Illinois St, Golden, CO, Rm 204)</p>
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                  *Non-USGS visitors are welcome! Please bring a photo ID and arrive early to allow time to go through building security*</p>
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<b>Date/Time: </b>Tuesday, February 7, 2023 10-11am MST</p>
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<span class="ContentPasted1"><b>Abstract: </b>In addition to ordinary earthquakes, low-frequency earthquakes (LFEs) at depths of 15–30 km have been studied in considerable detail near Parkfield. However, their focal mechanisms, which would provide direct evidence
 of the fault motion, have not been determined due to low signal-to-noise ratios.</span></p>
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<div class="ContentPasted1" style="">More than a million of LFEs have been classified into 88 families based on the similarity in the seismic waveforms (Shelly, 2017), and the events in the same family are considered to have the same source location and focal
 mechanism. We utilize the seismic energy of P- and S-waves to solve for the focal mechanism of each LFE family, based on the comparison with synthetic estimates.</div>
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<div class="ContentPasted1" style="">As a result, most of the LFEs are consistent with strike-slip plate motion on the San Andreas Fault. However, the focal mechanisms are rotated counterclockwise for the LFEs south of Parkfield. Their minor reverse-fault components
 are consistent both with the compressional regime expected mechanically for the counterclockwise rotation and with their temporal correlations to compressional tidal stress.</div>
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<div class="ContentPasted1" style=""><span class="ContentPasted2"><b>Bio: </b>Ph.D., University of Tokyo, 2015
<div class="ContentPasted2" style="">Postdoctoral Scholar, California Institute of Technology, 2015–2017</div>
<div class="ContentPasted2" style="">Project Assistant Professor, University of Tokyo, 2017–2018</div>
<div class="ContentPasted2" style="">Assistant Professor, Tokyo Institute of Technology, 2018–2023</div>
<div class="ContentPasted2" style="">Visiting Researcher*, USGS Golden, from November 16, 2022, through March 1, 2023</div>
<div class="ContentPasted2" style="">*Sabbatical visit</div>
<div class="ContentPasted2" style="">Research area: Mainly seismic wave analysis of small earthquakes, with broad contributions in stochastic modeling of seismicity, dynamic rupture simulation on earthquake faults, and own campaign observations.</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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