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<div class="x_ContentPasted0" style=""><span style="font-size:14pt"><b>3D physics-based large-scale earthquake simulations for seismic risk assessment: The case of Bogotá, Colombia</b></span><span style="font-size:12pt"><b></b></span></div>
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<div class="x_ContentPasted0" style=""><span style="font-size:12pt"><b>Speaker: </b>
Andrea Riaño</span></div>
<div class="x_ContentPasted0" style=""><span style="font-size:12pt"> Department of Geophysics</span></div>
<div class="x_ContentPasted0" style=""><span style="font-size:12pt"><span> Colorado School of Mines</span><br>
</span></div>
<div class="x_ContentPasted0" style=""><span style="font-size:12pt"><span><b>Location: HYBRID (online and in-person at 1711 Illinois St, Golden, CO, Rm 204)</b></span></span></div>
<div class="x_ContentPasted0" style=""><span style="font-size:12pt"><span><span class="x_ContentPasted1" style=""><b> </b>*Non-USGS visitors are very welcome</span></span></span><span style="font-size:12pt">! Please bring a photo ID and plan to arrive
~15 min early to allow time to go through building security.*</span></div>
<div class="x_ContentPasted0" style=""><span style="font-size:12pt"><b>Date/Time:
</b>Tuesday, Nov 29, 2022 10-11am MST</span></div>
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<div class="x_ContentPasted0" style=""><span style="font-size:12pt"><span class="x_ContentPasted2"><b>Abstract: </b>The basin beneath the greater metropolitan area of Bogotá, Colombia, consists of soft material deposits with values of shear wave velocity Vs
≤ 400 m/s that reach depths up to 425 m. Located on a high plateau in the eastern cordillera of the Colombian Andes, this highly populated urban area is subject to significant seismic hazard from local and regional fault systems. The potential ground motion
amplification effects during earthquakes due to the presence of soft soil deposits, as well as the effects of the surface and sub-surface topography, constitute problems of great importance towards better understanding and estimation of the seismic risk of
the city. Given the scarcity of seismic data from large magnitude events, and in an effort to advance modern seismic hazard mapping for the region, this study aimed to develop a physics-based framework to generate synthetic ground records that can help to
better understand the basin and other amplification effects during strong earthquake shaking in the region, and to then incorporate these effects into the estimation of seismic risk. To this end, a set of simulations were first conducted on Hercules, the wave
propagation octree-based finite element simulator developed by the Quake Group at Carnegie Mellon University, to reproduce similar conditions to those observed in Bogotá during past seismic events (e.g. 2008 Quetame Earthquake) and to identify the impacts
of hypothetical strong earthquakes scenarios. Then, the results from these simulations were integrated into a new software package for post-processing and to assess the seismic risk in the Bogotá region for different scenarios selected.</span></span></div>
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<div style=""><font color="#201f1e" face="Calibri, sans-serif"><span style="font-size:12pt; color:rgb(153,153,153)">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(153,153,153)">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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