[ghsc-seminars] GHSC Seminar *HYBRID* *TOMORROW* - Andrea Riaño, CSM, November 29, 2022

[Llenos, Andrea L]

3D physics-based large-scale earthquake simulations for seismic risk assessment: The case of Bogotá, Colombia​

Speaker: Andrea Riaño
                Department of Geophysics
           Colorado School of Mines
Location: HYBRID (online and in-person at 1711 Illinois St, Golden, CO, Rm 204)
            *Non-USGS visitors are very welcome! Please bring a photo ID and plan to arrive ~15 min early to allow time to go through building security.*
Date/Time: Tuesday, Nov 29, 2022 10-11am MST

Abstract: 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.

[cid:bb397ddc-2536-4f0a-a1b0-c4ae3e85778b]

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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