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Title: Tectonic tremor on Vancouver Island, Cascadia, modulated by the body and surface waves of the Mw 8.6 and 8.2, 2012 East Indian Ocean earthquakes: Tectonic Tremor on Vancouver Island

Abstract

The 2012 East Indian Ocean earthquake (Mw 8.6), so far the largest intraoceanic plate strike-slip event ever recorded, modulated tectonic tremors in the Cascadia subduction zone. The rate of tremor activity near Vancouver Island increased by about 1.5 times from its background level during the passage of seismic waves of this earthquake. In most cases of dynamic modulation, large-amplitude and long-period surface waves stimulate tremors. However, in this case even the small stress change caused by body waves generated by the 2012 earthquake modulated tremor activity. The tremor modulation continued during the passage of the surface waves, subsequent to which the tremor activity returned to background rates. Similar tremor modulation is observed during the passage of the teleseismic waves from the Mw 8.2 event, which occurs about 2 h later near the Mw 8.6 event. We show that dynamic stresses from back-to-back large teleseismic events can strongly influence tremor sources.

Authors:
 [1];  [2];  [2];  [3];  [4];  [5]
+ Show Author Affiliations
  1. National Inst. of Technology, Rourkela (India). Department of Earth and Atmospheric Sciences
  2. Univ. of California, Riverside, CA (United States). Dept. of Earth Sciences
  3. Univ. of California, Berkeley, CA (United States). Dept. of Earth and Planetary Science
  4. Ministry of Earth Sciences, New Delhi (India). National Centre for Seismology
  5. Indian National Centre for Ocean Information Services, Hyderabad (India)
Publication Date:
Research Org.:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1581120
Grant/Contract Number:  
AC02-05CH11231
Resource Type:
Accepted Manuscript
Journal Name:
Geophysical Research Letters
Additional Journal Information:
Journal Volume: 43; Journal Issue: 17; Journal ID: ISSN 0094-8276
Publisher:
American Geophysical Union
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES

Citation Formats

Kundu, Bhaskar, Ghosh, Abhijit, Mendoza, Manuel, Bürgmann, Roland, Gahalaut, V. K., and Saikia, Dipankar. Tectonic tremor on Vancouver Island, Cascadia, modulated by the body and surface waves of the Mw 8.6 and 8.2, 2012 East Indian Ocean earthquakes: Tectonic Tremor on Vancouver Island. United States: N. p., 2016. Web. doi:10.1002/2016gl069755.
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Kundu, Bhaskar, Ghosh, Abhijit, Mendoza, Manuel, Bürgmann, Roland, Gahalaut, V. K., & Saikia, Dipankar. Tectonic tremor on Vancouver Island, Cascadia, modulated by the body and surface waves of the Mw 8.6 and 8.2, 2012 East Indian Ocean earthquakes: Tectonic Tremor on Vancouver Island. United States. https://doi.org/10.1002/2016gl069755
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Kundu, Bhaskar, Ghosh, Abhijit, Mendoza, Manuel, Bürgmann, Roland, Gahalaut, V. K., and Saikia, Dipankar. Fri . "Tectonic tremor on Vancouver Island, Cascadia, modulated by the body and surface waves of the Mw 8.6 and 8.2, 2012 East Indian Ocean earthquakes: Tectonic Tremor on Vancouver Island". United States. https://doi.org/10.1002/2016gl069755. https://www.osti.gov/servlets/purl/1581120.
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@article{osti_1581120,
title = {Tectonic tremor on Vancouver Island, Cascadia, modulated by the body and surface waves of the Mw 8.6 and 8.2, 2012 East Indian Ocean earthquakes: Tectonic Tremor on Vancouver Island},
author = {Kundu, Bhaskar and Ghosh, Abhijit and Mendoza, Manuel and Bürgmann, Roland and Gahalaut, V. K. and Saikia, Dipankar},
abstractNote = {The 2012 East Indian Ocean earthquake (Mw 8.6), so far the largest intraoceanic plate strike-slip event ever recorded, modulated tectonic tremors in the Cascadia subduction zone. The rate of tremor activity near Vancouver Island increased by about 1.5 times from its background level during the passage of seismic waves of this earthquake. In most cases of dynamic modulation, large-amplitude and long-period surface waves stimulate tremors. However, in this case even the small stress change caused by body waves generated by the 2012 earthquake modulated tremor activity. The tremor modulation continued during the passage of the surface waves, subsequent to which the tremor activity returned to background rates. Similar tremor modulation is observed during the passage of the teleseismic waves from the Mw 8.2 event, which occurs about 2 h later near the Mw 8.6 event. We show that dynamic stresses from back-to-back large teleseismic events can strongly influence tremor sources.},
doi = {10.1002/2016gl069755},
journal = {Geophysical Research Letters},
number = 17,
volume = 43,
place = {United States},
year = {Fri Aug 26 00:00:00 EDT 2016},
month = {Fri Aug 26 00:00:00 EDT 2016}
}
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https://doi.org/10.1002/2016gl069755
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    Works referencing / citing this record:

    Migration of Deep Low‐Frequency Tremor Triggered by Teleseismic Earthquakes in the Southwest Japan Subduction Zone
    journal, April 2018

    • Kurihara, Ryo; Obara, Kazushige; Takeo, Akiko
    • Geophysical Research Letters, Vol. 45, Issue 8
    • DOI: 10.1002/2017gl076779
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