Evolution of the Seismic Source From Underground Explosions With Depth-of-burial
Description:
The Rock Valley earthquake/explosion Direct Comparison (RV/DC) venture is the third phase of the Source Physics Experiments (SPE) which plans to directly compare an earthquake and an explosion, detonated in the same material and at the same depth for the first time. Because earthquakes usually occur at deeper depths and in different media than explosions, uncertainties remain as to how those two parameters play into the observed differences. A corollary of the main objective of RVDC is to improve our physical understanding of how deep underground explosions generate seismic waves. In this paper, we propose to perform numerical modeling using the Hybrid Optimization Suite Software (HOSS), a combined finite-discrete element method code developed at LANL, to model the near-source physics and the transition to the elastic regime. Our goal is to determine how the size of the seismic source and the seismic radiation pattern change with the depth of the source in a dolomite model representative of the basement rock in the RV/DC site.
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We will measure the elastic radius of our series of modeled explosions, either as the distance at which the Reduced Displacement Potential stabilizes or as the distance the plastic strain falls below a certain threshold or vanishes (Larmat et al., AGU 2022). We will also couple our modeling with the SPECFEM3D seismic code to look at wave propagation patterns. We will also look at cavity radius given some explosive emplacement hypothesis. This series of modeling will allow us to develop an understanding of how seismic sources evolve as the confining pressure increases and as in-situ tectonic stresses are considered. We finally will compare elastic and cavity radius results with models used in the monitoring community such as Müller (1973), Denny & Johnson (1992), Ford et al. (2012).
Session: Exploiting Explosion Sources: Advancements in Seismic Source Physics [Poster]
Type: Poster
Date: 4/19/2023
Presentation Time: 08:00 AM (local time)
Presenting Author: Zhou Lei
Student Presenter: No
Invited Presentation:
Authors
Carene Larmat Corresponding Author carene@lanl.gov Los Alamos National Laboratory |
Zhou Lei Presenting Author zlei@lanl.gov Los Alamos National Laboratory |
Bryan Euser beuser@lanl.gov Los Alamos National Laboratory |
Esteban Rougier erougier@lanl.gov Los Alamos National Laboratory |
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Evolution of the Seismic Source From Underground Explosions With Depth-of-burial
Category
Exploiting Explosion Sources: Advancements in Seismic Source Physics