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In addition to our regular GHSC Seminar on Tuesday, May 9, please join us for this special GHSC Seminar on Thursday, May 11!</div>
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<span style="font-size: 14pt; font-family: Calibri, sans-serif; color: black;" class="ContentPasted0"><b>The 1886 Charleston, South Carolina, Earthquake: Relic Railroad Offset Reveals Rupture</b></span><br>
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<span style="font-size: 14pt; font-family: Calibri, sans-serif; color: black;" class="ContentPasted0"><span style="font-family: Calibri, sans-serif; font-size: 12pt; color: black; background-color: rgb(255, 255, 255);"><b>Speaker:
</b>Susan Hough</span><br>
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<span style="font-size: 14pt; font-family: Calibri, sans-serif; color: black;" class="ContentPasted0"><span style="font-family: Calibri, sans-serif; font-size: 12pt; color: black; background-color: rgb(255, 255, 255);"> Earthquake Science Center</span></span></div>
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<span style="font-size: 14pt; font-family: Calibri, sans-serif; color: black;" class="ContentPasted0"><span style="font-family: Calibri, sans-serif; font-size: 12pt; color: black; background-color: rgb(255, 255, 255);"> USGS</span></span></div>
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<span style="font-size: 14pt; font-family: Calibri, sans-serif; color: black;" class="ContentPasted0"><span style="font-family: Calibri, sans-serif; font-size: 12pt; color: black; background-color: rgb(255, 255, 255);"><b>Location:
</b>Hybrid (online and in-person at 1711 Illinois St, Golden, CO, Rm 204)</span></span></div>
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<span style="font-size: 14pt; font-family: Calibri, sans-serif; color: black;" class="ContentPasted0"><span style="font-family: Calibri, sans-serif; font-size: 12pt; color: black; background-color: rgb(255, 255, 255);"> *Non-USGS visitors welcome!
Please bring a photo ID and arrive early to allow time to go through building security*</span></span></div>
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<span style="font-size: 14pt; font-family: Calibri, sans-serif; color: black;" class="ContentPasted0"><span style="font-family: Calibri, sans-serif; font-size: 12pt; color: black; background-color: rgb(255, 255, 255);"><b>Date/Time: THURSDAY, MAY 11, 2023
</b>10-11AM MDT</span></span></div>
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<span style="font-size: 14pt; font-family: Calibri, sans-serif; color: black;" class="ContentPasted0"><span style="font-family: Calibri, sans-serif; font-size: 12pt; color: black; background-color: rgb(255, 255, 255);"><span class="ContentPasted1"><b>Abstract: </b>One
of the enduring mysteries in earthquake science has involved the earthquake that heavily damaged Charleston, South Carolina, in 1886. Although it was large enough to cause chandeliers to swing in Detroit and Cuba, and documented by extensive contemporary
observations, the causative fault(s) and seismotectonic framework for the Charleston Seismic Zone have remained poorly understood, with evidence of faulting obscured by saturated Atlantic Coastal Plain sediments. A detailed consideration of archival accounts,
regional stratigraphy and geomorphology, and inferred relic railroad offsets provide constraints with which an elastic deformation model can be developed, involving primary moment release on the Gants-Summerville fault. Modeling supports a moment magnitude
on the upper end of the range estimated previously from macroseismic data alone: Mw7.3. Ground motion predictions using an average of recently developed NGA-East ground motion models (GMMs) are highly consistent with the directly estimated near-field intensity
distribution. The suite of 17 NGA-East GMMs have high variability at magnitudes upwards of 6 due to a paucity of instrumental data. Arguably, the independent constraint on Mw for the Charleston earthquake provides an opportunity to evaluate proposed models.</span></span></span></div>
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<span style="font-size: 14pt; font-family: Calibri, sans-serif; color: black;" class="ContentPasted0"><span style="font-family: Calibri, sans-serif; font-size: 12pt; color: black; background-color: rgb(255, 255, 255);"><span class="ContentPasted1"><br>
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<span style="font-size: 14pt; font-family: Calibri, sans-serif; color: black;" class="ContentPasted0"><span style="font-family: Calibri, sans-serif; font-size: 12pt; color: black; background-color: rgb(255, 255, 255);"><span class="ContentPasted1"><b>Bio: </b><span style="font-size: 12pt; font-family: Calibri, sans-serif; color: black;" class="ContentPasted2">Susan
Hough joined the Pasadena USGS office in 1992, when dinosaurs roamed the earth, having received her PhD from Scripps Institution of Oceanography in 1988 and spent four years at Lamont-Doherty Geological Observatory. Her research interests include earthquake
ground motions, induced and triggered earthquakes, and historical earthquakes.</span></span></span></span></div>
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<span style="font-size: 14pt; font-family: Calibri, sans-serif; color: black;" class="ContentPasted0"><span style="font-family: Calibri, sans-serif; font-size: 12pt; color: black; background-color: rgb(255, 255, 255);"><span class="ContentPasted1"><span style="font-size: 12pt; font-family: Calibri, sans-serif; color: black;" class="ContentPasted2"><br>
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<span style="font-size: 14pt; font-family: Calibri, sans-serif; color: black;" class="ContentPasted0"><span style="font-family: Calibri, sans-serif; font-size: 12pt; color: black; background-color: rgb(255, 255, 255);"><span class="ContentPasted1"><span style="font-size: 12pt; font-family: Calibri, sans-serif; color: rgb(102, 102, 102);" class="ContentPasted2 ContentPasted3">For
questions, comments, or speaker suggestions, please contact the GHSC Seminar Committee: Andrea Llenos <allenos@usgs.gov>, Benjamin Murphy <bmurphy@usgs.gov>, Lauren Schaefer <lschaefer@usgs.gov></span><span style="font-size: 12pt; font-family: Calibri, sans-serif; color: black;" class="ContentPasted2 ContentPasted3"><br>
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