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Title: Seismic moment tensor event screening

Abstract

Event screening is an explosion monitoring practice that aims to identify an event as an explosion (‘screened in’) or not (‘screened out’). Confidence in event screening can be increased if multiple independent approaches are used. In this work, we describe a new approach to event screening using the seismic moment tensor and its representation on the hypersphere, specifically the 5-sphere of 6-degree unit vectors representing the normalized symmetric moment tensor. The sample of moment tensors from an explosion data set is unimodal on the 5-sphere and can be parametrized by the Langevin distribution, which is sometimes referred to as the Normal distribution on the hypersphere. Screening is then accomplished by finding the angle from the explosion population mean to any newly measured moment tensor and testing if that angle is in the tail of the Langevin distribution (conservatively quantified as greater than 99.9 per cent of the cumulative density). We apply the screen to a sample of earthquakes from the Western USA and the September 2017 explosion and subsequent collapse at the Pungyye-Ri Test Site in North Korea. All the earthquakes and the collapse screen out, but the explosion does not.

Authors:
 [1];  [2];  [1]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  2. Array Information Technology, Inc., Melbourne, FL (United States)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1642481
Report Number(s):
LLNL-JRNL-804110; LLNL-JRNL-723095; LLNL-JRNL-758729; LLNL-JRNL-662377
Journal ID: ISSN 0956-540X; 992927
Grant/Contract Number:  
AC52-07NA27344
Resource Type:
Accepted Manuscript
Journal Name:
Geophysical Journal International
Additional Journal Information:
Journal Volume: 221; Journal Issue: 1; Journal ID: ISSN 0956-540X
Publisher:
Oxford University Press
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; Seismology; statistical methods; earthquake monitoring and test-ban treaty verification; earthquake source observations

Citation Formats

Ford, Sean R., Kraft, Gordon D., and Ichinose, Gene A. Seismic moment tensor event screening. United States: N. p., 2020. Web. https://doi.org/10.1093/gji/ggz578.
Ford, Sean R., Kraft, Gordon D., & Ichinose, Gene A. Seismic moment tensor event screening. United States. https://doi.org/10.1093/gji/ggz578
Ford, Sean R., Kraft, Gordon D., and Ichinose, Gene A. Mon . "Seismic moment tensor event screening". United States. https://doi.org/10.1093/gji/ggz578. https://www.osti.gov/servlets/purl/1642481.
@article{osti_1642481,
title = {Seismic moment tensor event screening},
author = {Ford, Sean R. and Kraft, Gordon D. and Ichinose, Gene A.},
abstractNote = {Event screening is an explosion monitoring practice that aims to identify an event as an explosion (‘screened in’) or not (‘screened out’). Confidence in event screening can be increased if multiple independent approaches are used. In this work, we describe a new approach to event screening using the seismic moment tensor and its representation on the hypersphere, specifically the 5-sphere of 6-degree unit vectors representing the normalized symmetric moment tensor. The sample of moment tensors from an explosion data set is unimodal on the 5-sphere and can be parametrized by the Langevin distribution, which is sometimes referred to as the Normal distribution on the hypersphere. Screening is then accomplished by finding the angle from the explosion population mean to any newly measured moment tensor and testing if that angle is in the tail of the Langevin distribution (conservatively quantified as greater than 99.9 per cent of the cumulative density). We apply the screen to a sample of earthquakes from the Western USA and the September 2017 explosion and subsequent collapse at the Pungyye-Ri Test Site in North Korea. All the earthquakes and the collapse screen out, but the explosion does not.},
doi = {10.1093/gji/ggz578},
journal = {Geophysical Journal International},
number = 1,
volume = 221,
place = {United States},
year = {2020},
month = {1}
}

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Works referenced in this record:

Experimental Seismic Event-screening Criteria at the Prototype International Data Center
journal, February 2002


Source type plot for inversion of the moment tensor
journal, January 1989

  • Hudson, J. A.; Pearce, R. G.; Rogers, R. M.
  • Journal of Geophysical Research, Vol. 94, Issue B1
  • DOI: 10.1029/JB094iB01p00765

Estimation of Full Moment Tensors, Including Uncertainties, for Nuclear Explosions, Volcanic Events, and Earthquakes
journal, June 2018

  • Alvizuri, Celso; Silwal, Vipul; Krischer, Lion
  • Journal of Geophysical Research: Solid Earth, Vol. 123, Issue 6
  • DOI: 10.1029/2017JB015325

Optimal estimation of scalar seismic moment
journal, September 1982


Cluster analysis of seismic moment tensor orientations
journal, December 1993


A geometric setting for moment tensors: A geometric setting for moment tensors
journal, May 2012


Statistical inference of Langevin distribution for directional data
journal, January 1996


A uniform parametrization of moment tensors
journal, July 2015

  • Tape, Walter; Tape, Carl
  • Geophysical Journal International, Vol. 202, Issue 3
  • DOI: 10.1093/gji/ggv262

A confidence parameter for seismic moment tensors
journal, February 2016

  • Tape, Walter; Tape, Carl
  • Geophysical Journal International, Vol. 205, Issue 2
  • DOI: 10.1093/gji/ggw057

Simulation of the von mises fisher distribution
journal, January 1994

  • Wood, Andrew T. A.
  • Communications in Statistics - Simulation and Computation, Vol. 23, Issue 1
  • DOI: 10.1080/03610919408813161

Regional distance seismic moment tensors of nuclear explosions
journal, October 2002


Identifying isotropic events using a regional moment tensor inversion: ISOTROPIC EVENTS
journal, January 2009

  • Ford, Sean R.; Dreger, Douglas S.; Walter, William R.
  • Journal of Geophysical Research: Solid Earth, Vol. 114, Issue B1
  • DOI: 10.1029/2008JB005743

Source Parameters of Eastern California and Western Nevada Earthquakes from Regional Moment Tensor Inversion
journal, February 2003

  • Ichinose, G. A.
  • Bulletin of the Seismological Society of America, Vol. 93, Issue 1
  • DOI: 10.1785/0120020063

Stable inversions for complete moment tensors
journal, August 2008


Volume in moment tensor space in terms of distance
journal, April 2017

  • Tape, Walter; Tape, Carl
  • Geophysical Journal International, Vol. 210, Issue 1
  • DOI: 10.1093/gji/ggx164

mb:Ms Event Screening Revisited
journal, February 2012

  • Selby, N. D.; Marshall, P. D.; Bowers, D.
  • Bulletin of the Seismological Society of America, Vol. 102, Issue 1
  • DOI: 10.1785/0120100349