Ionospheric Plasma Response to M w 8.3 Chile Illapel Earthquake on September 16, 2015

Reddy, C. D.; Shrivastava, Mahesh N.; Seemala, G. K.; González, Gabriel; Báez, J. C.

doi:10.1007/978-3-319-57822-4_12

Cited by 18 publications

(21 citation statements)

References 42 publications

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“…The north-south asymmetry in TEC perturbations is reproduced by the simulation for most cases. While such an asymmetry in the GPS data could be possibly attributed to the north-south asymmetry in the ground movement or the rupture propagation as pointed out by Reddy et al (2016), this cannot explain the asymmetry in the simulation, since WP-GITM takes a point source and no horizontal asymmetry can be generated before the spherical acoustic-gravity waves reach the interface between the analytical model and GITM at about 100-km altitude. The north-south asymmetry in the simulated TEC perturbations could only be generated by the satellite positions and/or the GITM-computed ionospheric conditions above 100-km altitude.…”

Section: Illapel Chile Earthquakementioning

confidence: 89%

Physics‐Based Modeling of Earthquake‐Induced Ionospheric Disturbances

et al. 2018

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To numerically simulate earthquake‐induced ionospheric disturbances, we extend the Wave Perturbation‐Global Ionosphere‐Thermosphere Model, which was originally developed for tsunami‐ionosphere coupling via gravity waves, to the case of earthquake‐ionosphere coupling via acoustic‐gravity waves. The new Wave Perturbation‐Global Ionosphere‐Thermosphere Model represents epicentral crustal movements by a point source specified with the ground motion data from seismic measurements. The model then solves for the neutral atmospheric perturbations generated by spherical acoustic‐gravity waves and the resulting ionospheric plasma perturbations over the epicentral area. We apply the model to simulate the near‐field ionospheric disturbances during two major earthquake events: the 2011 Tohoku‐Oki, Japan, and the 2015 Illapel, Chile, events. To validate the results, we extract receiver‐to‐satellite total electron content perturbations from the simulations and compare them to the corresponding slant total electron content perturbations from Global Positioning System observations. We find good agreement on magnitudes and arrival times between the simulations and observations.

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Section: Illapel Chile Earthquakementioning

confidence: 89%

Physics‐Based Modeling of Earthquake‐Induced Ionospheric Disturbances

et al. 2018

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“…The 2015 Illapel Mw 8.3 earthquake also generated a tsunami. By means of tens of GNSS receivers, Reddy et al [8] reported the characteristics of ionospheric perturbations induced by shock acoustic waves of the earthquake/tsunami, proving the advantages of GPS observation networks in imaging tsunami-driven ionospheric perturbations.…”

Section: Introductionmentioning

confidence: 99%

ADDTID: An Alternative Tool for Studying Earthquake/Tsunami Signatures in the Ionosphere. Case of the 2011 Tohoku Earthquake

2019

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In this work, we characterized the ionospheric disturbances generated during the Japan Tohoku earthquake of 11 March 2011, by means of the Atomic Decomposition Detector of Traveling Ionospheric Disturbances (ADDTID) algorithm. This algorithm automatically detects and characterizes Traveling Ionospheric Disturbances (TIDs) from Global Navigation Satellite System (GNSS) measurements. Applying the high-precision estimates of ADDTID, the propagation parameters would make it easier to distinguish TIDs from different origins, in particular the characteristics conforming the acoustic gravity waves driven by the earthquake/tsunami. This method does not assume that disturbances follow a circular pattern of propagation, and can estimate the location by the propagation pattern of tsunami wavefronts and related TIDs. In this work, we present in a single framework a description of phenomena observed by different researchers. By means of the ADDTID algorithm, we detect: (a) simultaneous TIDs of different characteristics, where the detection was robust against the curvature of the wave fronts of the perturbations and the accuracy of the estimated parameters. The results were double-checked by visual inspection from detrended Vertical Total Electron Content (VTEC) maps and keogram plots, and the parameters of the slow-speed TIDs were consistent with the tsunami waveform measurements; (b) different wavefronts between the west and east TIDs around the epicenter, consistent in time and space with the post-earthquake tsunami; (c) complete evolution of the circular TIDs driven by the tsunami during the GNSS observable area; (d) fast and short circular TIDs related to the acoustic waves of earthquake; (e) the pre-seismic activity consisting of a set of fast westward TIDs, and the comparison with neighboring days; (f) the location estimation of the tsunami wavefront along the coast and the possible use as early warning. Finally, we report disturbances that had not been previously published with a possible application to local and real-time detection of tsunamis.

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“…Ionospheric disturbances were already detected for one of the most recent major earthquakes in Chile (Reddy et al 2016;Daneshvar and Freund 2017). A coseismic ionospheric anomaly was detected by Reddy et al (2016) 10 min after the Illapel earthquake in Chile of Mw 8.3 that happened on September 16, 2015. They detected this disturbance by deriving VTEC directly from GPS data.…”

Section: Introductionmentioning

confidence: 96%

“…Because of its location, atop of the subducting Nazca plate, earthquakes are constantly happening in Chile (Lomnitz 2004;Reddy et al 2016;Ruiz and Madariaga 2018). Some of the major ones in the recent years, for instance, the September 16, 2015 Mw 8.3 (Ren et al 2017) and the April 1, 2014 Mw 8.2 (Thorne et al 2014) earthquakes, were the cause of many fatalities according to the media.…”

Section: Introductionmentioning

confidence: 99%

Positive and negative ionospheric disturbances prior to the 2016 christmas earthquake in Chile

Sotomayor-Beltran

2019

Geomatics, Natural Hazards and Risk

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Global ionospheric maps (GIMs) provided by the Center for Orbit Determination in Europe (CODE) served to analyze ionospheric disturbances prior to the December 25, 2016 earthquake in Chile. Generating global two-dimensional differential vertical total electron content (VTEC) maps it was possible to detect three ionospheric disturbances. Eleven days (December 14, 2016) before the seismic event a positive ionospheric anomaly was detected. On the other hand, 8, 7 and 6 days prior to the earthquake, two negative ionospheric anomalies were also observed. All three anomalies were seen to fall inside the earthquake preparation region. Because during the days in which all three anomalies were observed, the geomagnetic and solar conditions were rather quiet and also the anomalies were localized, it can be suggested that they are seismo-ionospheric signatures due to the Chilo e earthquake. Moreover, it could be also indicated that the possible physical mechanism that originates these three anomalies is air ionization due to the emanation of radon from the Earth's crust. It is very likely that for the negative ionospheric anomaly observed between December 18 and December 19, 2016, the fountain effect of the Equatorial Ionization Anomaly (EIA) plays a role as well in its generation.

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Ionospheric Plasma Response to M w 8.3 Chile Illapel Earthquake on September 16, 2015

Cited by 18 publications

References 42 publications

Physics‐Based Modeling of Earthquake‐Induced Ionospheric Disturbances

Physics‐Based Modeling of Earthquake‐Induced Ionospheric Disturbances

ADDTID: An Alternative Tool for Studying Earthquake/Tsunami Signatures in the Ionosphere. Case of the 2011 Tohoku Earthquake

Positive and negative ionospheric disturbances prior to the 2016 christmas earthquake in Chile

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