Damage Characterization for the SPE Phase of the Source Physics Experiment
Session: Explosion Seismology Applications and Advances [Poster]
Type: Poster
Date: 4/19/2021
Presentation Time: 11:30 AM Pacific
Description:
Monitoring capabilities heavily rely on the ability to link seismic features such as amplitude of a particular seismic phase to characteristics of explosions such as their yield and depth of burial. An underground explosion interacts with the surrounding material, creating damage which may include fracture generation or permanent surface deformation.
In this presentation, we study how the creation of damage may affect the efficiency of explosions in generating seismic energy. We use data collected during the first phase of the Source Physics Experiment (SPE), which is a series of highly instrumented chemical explosions at the Nevada National Security Site. During the first phase, 6 explosions, ranging from 89 to 5,035 kg TNT equivalent, were conducted in a borehole in a granite outcrop between 2010 and 2016. Scaled depths of burial range from 190 to 1550 m/kt1/3. Analysis of the 2-8 Hz Rg waves recorded by a network of GS11D geophones situated within a range of 2 km from the borehole is consistent with late-time damage acting as a secondary source of high-frequency Rg waves (Larmat, Rougier, & Patton, 2017). High-resolution Digital Elevation Models have been collected to measure surface deformation resulting from each explosion in the series (Schultz-Fellenz et al. 2018; 2020). Our goal is to test and investigate a link between deformation observations and seismic signatures. Our approach is a combination of analyses of disparate physical manifestations of damage: fractures, surface deformation and seismic features. This analysis is guided by hydrodynamic modeling using the LANL Hybrid Optimization Software Suite (HOSS), which uses a macro-scale material models mixing elastic, plastic, discrete fracture and pore-crush regimes. Seismic analysis includes seismic moment inversions and spallation analysis. This work is the first step in investigating and quantifying differences between spallation and surface deformation in the SPE series. LA-UR-21-20087.
Presenting Author: Carene Larmat
Student Presenter: No
Authors
Carene Larmat Presenting Author Corresponding Author carene@lanl.gov Los Alamos National Laboratory |
Erika Swanson emswanson@lanl.gov Los Alamos National Laboratory |
Zhou Lei zlei@lanl.gov Los Alamos National Laboratory |
Brandon Crawford bcrawford@lanl.gov Los Alamos National Laboratory |
Emily Schultz-Fellenz eschultz@lanl.gov Los Alamos National Laboratory |
Howard Patton patton@lanl.gov Los Alamos National Laboratory |
Michael Cleveland mcleveland@lanl.gov Los Alamos National Laboratory |
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Damage Characterization for the SPE Phase of the Source Physics Experiment
Category
Explosion Seismology Applications and Advances