GNSS TEC-based detection and analysis of acoustic-gravity waves from the 2012 Sumatra double earthquake sequence
The Wharton Basin earthquake sequence on April 11, 2012, offshore Sumatra, represents the two largest (Mw > 8.0) strike-slip earthquakes ever recorded. Ground fault displacements generated a spectrum of acoustic-gravity waves due to solid Earth–atmosphere coupling. Wave-like perturbations in Tota...
| Main Authors: | , , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2021
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| Online Access: | https://hdl.handle.net/10356/152941 |
| _version_ | 1826109988775395328 |
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| author | Srivastava, Sarthak Chandran, Amal Manta, Fabio Taisne, Benoit |
| author2 | Earth Observatory of Singapore |
| author_facet | Earth Observatory of Singapore Srivastava, Sarthak Chandran, Amal Manta, Fabio Taisne, Benoit |
| author_sort | Srivastava, Sarthak |
| collection | NTU |
| description | The Wharton Basin earthquake sequence on April 11, 2012, offshore Sumatra, represents the two largest (Mw > 8.0) strike-slip earthquakes ever recorded. Ground fault displacements generated a spectrum of acoustic-gravity waves due to solid Earth–atmosphere coupling. Wave-like perturbations in Total Electron Content (TEC) were therefore observed in ground-based Global Positioning System data. The waves arrive about 10 min after each earthquake and their spectral analysis reveals the presence of acoustic resonance frequencies of 3.8 and 4.4 mHz. The acoustic wave speeds of 0.9–1.2 km/s suggest coseismic ground movement as the primary wave generating mechanism instead of seismic Rayleigh waves. Gravity waves with frequencies below 2 mHz traveling with lower speeds of 0.21 km/s are also detected. Ray tracing using a simple numerical model traced the source of observed ionospheric perturbations to within 150 km distance of the epicenters. Large amplitude ionospheric disturbances were found to travel mostly in a north-south direction, an observation explained by the orientation of Earth’s geomagnetic field. |
| first_indexed | 2024-10-01T02:27:26Z |
| format | Journal Article |
| id | ntu-10356/152941 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T02:27:26Z |
| publishDate | 2021 |
| record_format | dspace |
| spelling | ntu-10356/1529412022-03-15T02:54:26Z GNSS TEC-based detection and analysis of acoustic-gravity waves from the 2012 Sumatra double earthquake sequence Srivastava, Sarthak Chandran, Amal Manta, Fabio Taisne, Benoit Earth Observatory of Singapore Satellite Research Centre Science::Geology::Volcanoes and earthquakes Acoustic-gravity Waves Sumatra Earthquake The Wharton Basin earthquake sequence on April 11, 2012, offshore Sumatra, represents the two largest (Mw > 8.0) strike-slip earthquakes ever recorded. Ground fault displacements generated a spectrum of acoustic-gravity waves due to solid Earth–atmosphere coupling. Wave-like perturbations in Total Electron Content (TEC) were therefore observed in ground-based Global Positioning System data. The waves arrive about 10 min after each earthquake and their spectral analysis reveals the presence of acoustic resonance frequencies of 3.8 and 4.4 mHz. The acoustic wave speeds of 0.9–1.2 km/s suggest coseismic ground movement as the primary wave generating mechanism instead of seismic Rayleigh waves. Gravity waves with frequencies below 2 mHz traveling with lower speeds of 0.21 km/s are also detected. Ray tracing using a simple numerical model traced the source of observed ionospheric perturbations to within 150 km distance of the epicenters. Large amplitude ionospheric disturbances were found to travel mostly in a north-south direction, an observation explained by the orientation of Earth’s geomagnetic field. Published version 2021-10-22T01:32:16Z 2021-10-22T01:32:16Z 2021 Journal Article Srivastava, S., Chandran, A., Manta, F. & Taisne, B. (2021). GNSS TEC-based detection and analysis of acoustic-gravity waves from the 2012 Sumatra double earthquake sequence. Journal of Geophysical Research: Space Physics, 126(6), e2020JA028507-. https://dx.doi.org/10.1029/2020JA028507 2169-9402 https://hdl.handle.net/10356/152941 10.1029/2020JA028507 2-s2.0-85110577818 6 126 e2020JA028507 en Journal of Geophysical Research: Space Physics 10.21979/N9/SKQRTF © 2021 American Geophysical Union. All Rights Reserved. This paper was published in Journal of Geophysical Research: Space Physics and is made available with permission of American Geophysical Union. application/pdf |
| spellingShingle | Science::Geology::Volcanoes and earthquakes Acoustic-gravity Waves Sumatra Earthquake Srivastava, Sarthak Chandran, Amal Manta, Fabio Taisne, Benoit GNSS TEC-based detection and analysis of acoustic-gravity waves from the 2012 Sumatra double earthquake sequence |
| title | GNSS TEC-based detection and analysis of acoustic-gravity waves from the 2012 Sumatra double earthquake sequence |
| title_full | GNSS TEC-based detection and analysis of acoustic-gravity waves from the 2012 Sumatra double earthquake sequence |
| title_fullStr | GNSS TEC-based detection and analysis of acoustic-gravity waves from the 2012 Sumatra double earthquake sequence |
| title_full_unstemmed | GNSS TEC-based detection and analysis of acoustic-gravity waves from the 2012 Sumatra double earthquake sequence |
| title_short | GNSS TEC-based detection and analysis of acoustic-gravity waves from the 2012 Sumatra double earthquake sequence |
| title_sort | gnss tec based detection and analysis of acoustic gravity waves from the 2012 sumatra double earthquake sequence |
| topic | Science::Geology::Volcanoes and earthquakes Acoustic-gravity Waves Sumatra Earthquake |
| url | https://hdl.handle.net/10356/152941 |
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