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Title: Joint inversion of gravity and cosmic ray muon flux at a well-characterised site for shallow subsurface density prediction

Abstract

Estimating subsurface density is important for imaging various geologic structures such as volcanic edifices, reservoirs, and aquifers. Muon tomography has recently been used to complement traditional gravity measurements as a powerful method for probing shallow subsurface density structure beneath volcanoes. Gravity and muon data have markedly different spatial sensitivities and, as a result, the combination is useful for imaging structures on spatial scales that are larger than the area encompassed by crossing muon trajectories. Here we explore and test a joint inversion of gravity and muon data in a study area where there is an independently-characterised target anomaly: a regionally extensive, high-density layer beneath Los Alamos, New Mexico, USA. We resolve the nearly flat-lying structure using a unique experimental set-up wherein surface and subsurface gravity and muon measurements are obtained above and below the target volume. Our results show that with minimal geologic (prior) constraints, the joint inversion correctly recovers salient features of the expected density structure. The results of our study illustrate the potential of combining surface and subsurface (e.g., borehole) gravity and muon measurements to invert for shallow geologic structures.

Authors:
ORCiD logo [1];  [1];  [2];  [2]
  1. Univ. of New Mexico, Albuquerque, NM (United States)
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1501805
Report Number(s):
LA-UR-18-23891
Journal ID: ISSN 0956-540X
Grant/Contract Number:  
89233218CNA000001
Resource Type:
Accepted Manuscript
Journal Name:
Geophysical Journal International
Additional Journal Information:
Journal Volume: 217; Journal Issue: 3; Journal ID: ISSN 0956-540X
Publisher:
Oxford University Press
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; Muon imaging; gravity modeling; joint inversion

Citation Formats

Cosburn, Katherine, Roy, Mousumi, Guardincerri, Elena, and Rowe, Charlotte. Joint inversion of gravity and cosmic ray muon flux at a well-characterised site for shallow subsurface density prediction. United States: N. p., 2019. Web. doi:10.1093/gji/ggz127.
Cosburn, Katherine, Roy, Mousumi, Guardincerri, Elena, & Rowe, Charlotte. Joint inversion of gravity and cosmic ray muon flux at a well-characterised site for shallow subsurface density prediction. United States. doi:10.1093/gji/ggz127.
Cosburn, Katherine, Roy, Mousumi, Guardincerri, Elena, and Rowe, Charlotte. Fri . "Joint inversion of gravity and cosmic ray muon flux at a well-characterised site for shallow subsurface density prediction". United States. doi:10.1093/gji/ggz127. https://www.osti.gov/servlets/purl/1501805.
@article{osti_1501805,
title = {Joint inversion of gravity and cosmic ray muon flux at a well-characterised site for shallow subsurface density prediction},
author = {Cosburn, Katherine and Roy, Mousumi and Guardincerri, Elena and Rowe, Charlotte},
abstractNote = {Estimating subsurface density is important for imaging various geologic structures such as volcanic edifices, reservoirs, and aquifers. Muon tomography has recently been used to complement traditional gravity measurements as a powerful method for probing shallow subsurface density structure beneath volcanoes. Gravity and muon data have markedly different spatial sensitivities and, as a result, the combination is useful for imaging structures on spatial scales that are larger than the area encompassed by crossing muon trajectories. Here we explore and test a joint inversion of gravity and muon data in a study area where there is an independently-characterised target anomaly: a regionally extensive, high-density layer beneath Los Alamos, New Mexico, USA. We resolve the nearly flat-lying structure using a unique experimental set-up wherein surface and subsurface gravity and muon measurements are obtained above and below the target volume. Our results show that with minimal geologic (prior) constraints, the joint inversion correctly recovers salient features of the expected density structure. The results of our study illustrate the potential of combining surface and subsurface (e.g., borehole) gravity and muon measurements to invert for shallow geologic structures.},
doi = {10.1093/gji/ggz127},
journal = {Geophysical Journal International},
number = 3,
volume = 217,
place = {United States},
year = {2019},
month = {3}
}

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