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Back-Azimuth Estimation of Air-to-Ground Coupled Infrasound from Transverse Coherence Minimization

Journal Article · · The Seismic Record
DOI:https://doi.org/10.1785/0320230023· OSTI ID:2008294
 [1];  [2];  [3];  [4];  [5];  [2]
  1. University of Alaska, Fairbanks, AK (United States); Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
  2. Alaska Volcano Observatory, Anchorage, AK (United States)
  3. University of Alaska, Fairbanks, AK (United States)
  4. University of California, Santa Barbara, CA (United States)
  5. Vanderbilt University, Nashville, TN (United States)
+ Show Author Affiliations

We present the transverse coherence minimization method (TCM)—an approach to estimate the back–azimuth of infrasound signals that are recorded on an infrasound microphone and a colocated three–component seismometer. Accurate back–azimuth information is important for a variety of monitoring efforts, but it is currently only available for infrasound arrays and for seismoacoustic sensor pairs separated by 10 s of meters. Our TCM method allows for the analysis of colocated sensor pairs, sensors located within a few meters of each other, which may extend the capabilities of existing seismoacoustic networks and supplement operating infrasound arrays. This approach minimizes the coherence of the transverse component of seismic displacement with the infrasound wave to estimate the infrasound back–azimuth. After developing an analytical model, we investigate seismoacoustic signals from the August 2012 Humming Roadrunner experiment and the 26 May 2021 eruption of Great Sitkin Volcano, Alaska, U.S.A., at the ranges of 6.5–185 km from the source. We discuss back–azimuth estimates and potential sources of deviation (1°–15°), such as local terrain effects or deviation from common analytical models. This practical method complements existing seismoacoustic tools and may be suitable for routine application to signals of interest.

Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA); National Science Foundation (NSF)
Grant/Contract Number:
89233218CNA000001
OSTI ID:
2008294
Report Number(s):
LA-UR--23-25003
Journal Information:
The Seismic Record, Journal Name: The Seismic Record Journal Issue: 4 Vol. 3; ISSN 2694-4006
Publisher:
Seismological Society of AmericaCopyright Statement
Country of Publication:
United States
Language:
English

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