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
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...
Saved in:
| Main Authors: | , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Wiley
2016-09-01
|
| Series: | Geophysical Research Letters |
| Subjects: | |
| Online Access: | https://doi.org/10.1002/2016GL069755 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1850134534607077376 |
|---|---|
| author | Bhaskar Kundu Abhijit Ghosh Manuel Mendoza Roland Bürgmann V. K. Gahalaut Dipankar Saikia |
| author_facet | Bhaskar Kundu Abhijit Ghosh Manuel Mendoza Roland Bürgmann V. K. Gahalaut Dipankar Saikia |
| author_sort | Bhaskar Kundu |
| collection | DOAJ |
| description | 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. |
| format | Article |
| id | doaj-art-d440e47490a04e9788656bf951542ef1 |
| institution | OA Journals |
| issn | 0094-8276 1944-8007 |
| language | English |
| publishDate | 2016-09-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geophysical Research Letters |
| spelling | doaj-art-d440e47490a04e9788656bf951542ef12025-08-20T02:31:42ZengWileyGeophysical Research Letters0094-82761944-80072016-09-0143179009901710.1002/2016GL069755Tectonic tremor on Vancouver Island, Cascadia, modulated by the body and surface waves of the Mw 8.6 and 8.2, 2012 East Indian Ocean earthquakesBhaskar Kundu0Abhijit Ghosh1Manuel Mendoza2Roland Bürgmann3V. K. Gahalaut4Dipankar Saikia5Department of Earth and Atmospheric Sciences NIT Rourkela Rourkela IndiaDepartment of Earth Sciences University of California Riverside California USADepartment of Earth Sciences University of California Riverside California USADepartment of Earth and Planetary Science University of California Berkeley California USANational Centre for Seismology Ministry of Earth Sciences New Delhi IndiaIndian National Centre for Ocean Information Services Hyderabad IndiaAbstract 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.https://doi.org/10.1002/2016GL069755CascadiaEast Indian Ocean earthquaketremorVancouver Island |
| spellingShingle | Bhaskar Kundu Abhijit Ghosh Manuel Mendoza Roland Bürgmann V. K. Gahalaut Dipankar Saikia 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 Geophysical Research Letters Cascadia East Indian Ocean earthquake tremor Vancouver Island |
| 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 |
| title_full | 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 |
| title_fullStr | 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 |
| title_full_unstemmed | 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 |
| title_short | 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 |
| title_sort | 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 |
| topic | Cascadia East Indian Ocean earthquake tremor Vancouver Island |
| url | https://doi.org/10.1002/2016GL069755 |
| work_keys_str_mv | AT bhaskarkundu tectonictremoronvancouverislandcascadiamodulatedbythebodyandsurfacewavesofthemw86and822012eastindianoceanearthquakes AT abhijitghosh tectonictremoronvancouverislandcascadiamodulatedbythebodyandsurfacewavesofthemw86and822012eastindianoceanearthquakes AT manuelmendoza tectonictremoronvancouverislandcascadiamodulatedbythebodyandsurfacewavesofthemw86and822012eastindianoceanearthquakes AT rolandburgmann tectonictremoronvancouverislandcascadiamodulatedbythebodyandsurfacewavesofthemw86and822012eastindianoceanearthquakes AT vkgahalaut tectonictremoronvancouverislandcascadiamodulatedbythebodyandsurfacewavesofthemw86and822012eastindianoceanearthquakes AT dipankarsaikia tectonictremoronvancouverislandcascadiamodulatedbythebodyandsurfacewavesofthemw86and822012eastindianoceanearthquakes |