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...

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Main Authors: Srivastava, Sarthak, Chandran, Amal, Manta, Fabio, Taisne, Benoit
Other Authors: Earth Observatory of Singapore
Format: Article
Language:English
Published: 2021
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Online Access:https://hdl.handle.net/10356/152941
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spelling sg-ntu-dr.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
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Science::Geology::Volcanoes and earthquakes
Acoustic-gravity Waves
Sumatra Earthquake
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
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.
author2 Earth Observatory of Singapore
author_facet Earth Observatory of Singapore
Srivastava, Sarthak
Chandran, Amal
Manta, Fabio
Taisne, Benoit
format Article
author Srivastava, Sarthak
Chandran, Amal
Manta, Fabio
Taisne, Benoit
author_sort Srivastava, Sarthak
title 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_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_sort gnss tec-based detection and analysis of acoustic-gravity waves from the 2012 sumatra double earthquake sequence
publishDate 2021
url https://hdl.handle.net/10356/152941
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