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Title: Tectonic tremor characterized by principal-component analysis in the vicinity of central Chile and Argentina

Abstract

No conclusive evidence has been presented to date for tectonic tremor (TT) in the vicinity of central Chile, where the Nazca Plate is subducting beneath the South American Plate. Subduction in our experimental location (roughly 35.5° S, 70.5° W) is steep and fairly unobstructed compared to the flattened and more seismogenic behavior to the north. We seek to identify TT in our experimental area, whose geodynamics are comparable to tremor-rich subduction zones such as Cascadia and the Nankai Trough. Our method combines time-series visual inspection, frequency-spectrum analysis, waveform cross-correlation, and 3-component (3C) signal covariance to explore the presence of TT in this region. We have identified TT using stations in central Chile and the Malargüe region, Argentina. The TT exhibits similar features to other TT observations worldwide. Waveform characteristics for the TT in our study, particularly dimension of the 3C signal covariance, vary as a function of apparent source location. The duration of one episode of identified TT was about 10 h, which may indicate that the plate interface where tremor generates is strongly coupled. Here, we conclude that our observations reflect features of the local propagation, rather than the tremor source itself.

Authors:
 [1];  [2];  [3]; ORCiD logo [4]; ORCiD logo [5]
  1. Delft Univ. of Technology (The Netherlands); Petro Summit E&P Corp. (Japan)
  2. OVDAS-SERNAGEOMIN (Chile)
  3. CNEA (Argentina)
  4. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  5. Delft Univ. of Technology (The Netherlands)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1512746
Report Number(s):
LA-UR-19-20128
Journal ID: ISSN 0895-9811
Grant/Contract Number:  
89233218CNA000001
Resource Type:
Accepted Manuscript
Journal Name:
Journal of South American Earth Sciences
Additional Journal Information:
Journal Name: Journal of South American Earth Sciences; Journal ID: ISSN 0895-9811
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; tectonic tremor; Chile; Argentina; subduction; array; geophysics; principal-component; cross-correlation

Citation Formats

Nishitsuji, Yohei, Franco Marin, Luis Enrique, Gomez, Martín, Rowe, Charlotte Anne, and Draganov, Deyan. Tectonic tremor characterized by principal-component analysis in the vicinity of central Chile and Argentina. United States: N. p., 2019. Web. doi:10.1016/j.jsames.2019.04.022.
Nishitsuji, Yohei, Franco Marin, Luis Enrique, Gomez, Martín, Rowe, Charlotte Anne, & Draganov, Deyan. Tectonic tremor characterized by principal-component analysis in the vicinity of central Chile and Argentina. United States. doi:10.1016/j.jsames.2019.04.022.
Nishitsuji, Yohei, Franco Marin, Luis Enrique, Gomez, Martín, Rowe, Charlotte Anne, and Draganov, Deyan. Mon . "Tectonic tremor characterized by principal-component analysis in the vicinity of central Chile and Argentina". United States. doi:10.1016/j.jsames.2019.04.022.
@article{osti_1512746,
title = {Tectonic tremor characterized by principal-component analysis in the vicinity of central Chile and Argentina},
author = {Nishitsuji, Yohei and Franco Marin, Luis Enrique and Gomez, Martín and Rowe, Charlotte Anne and Draganov, Deyan},
abstractNote = {No conclusive evidence has been presented to date for tectonic tremor (TT) in the vicinity of central Chile, where the Nazca Plate is subducting beneath the South American Plate. Subduction in our experimental location (roughly 35.5° S, 70.5° W) is steep and fairly unobstructed compared to the flattened and more seismogenic behavior to the north. We seek to identify TT in our experimental area, whose geodynamics are comparable to tremor-rich subduction zones such as Cascadia and the Nankai Trough. Our method combines time-series visual inspection, frequency-spectrum analysis, waveform cross-correlation, and 3-component (3C) signal covariance to explore the presence of TT in this region. We have identified TT using stations in central Chile and the Malargüe region, Argentina. The TT exhibits similar features to other TT observations worldwide. Waveform characteristics for the TT in our study, particularly dimension of the 3C signal covariance, vary as a function of apparent source location. The duration of one episode of identified TT was about 10 h, which may indicate that the plate interface where tremor generates is strongly coupled. Here, we conclude that our observations reflect features of the local propagation, rather than the tremor source itself.},
doi = {10.1016/j.jsames.2019.04.022},
journal = {Journal of South American Earth Sciences},
number = ,
volume = ,
place = {United States},
year = {2019},
month = {5}
}

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This content will become publicly available on May 6, 2020
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