Examples of unusual ionospheric observations made by the DEMETER satellite over seismic regions

Parrot, M.; Berthelier, Jean‐Jacques; Lebreton, Jean‐Pierre; Sauvaud, J. A.; Santolı́k, O.; Błȩcki, J.

doi:10.1016/j.pce.2006.02.011

Cited by 179 publications

(105 citation statements)

References 13 publications

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“…The variations of the magnetic field were present during this entire interval. The effect shown in this case is very weak in comparison to the effect reported from DEMETER registration (Parrot et al 2006;Błęcki et al 2010), but clearly seen. The spectra have a maximum in the lowest part of the frequency range and correspond to the range below the oxygen ions O ?…”

Section: Resultscontrasting

confidence: 64%

Pre-seismic geomagnetic and ionosphere signatures related to the Mw5.7 earthquake occurred in Vrancea zone on September 24, 2016

et al. 2018

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To emphasize the relationship between the pre-seismic geomagnetic signals and Vrancea seismicity, in this work it is hypothesized that before an earthquake initiation, the high stress reached into seismogenic volume generates dehydration of the rocks and fracturing processes followed by release of electric charges along the faulting systems, which lead to resistivity changes. These changes were explored on September 2016 by the normalized function Bzn obtained from the geomagnetic data recorded in ULF range (0.001-0.0083 Hz). A statistical analysis was also performed to discriminate on the new Bzn* time series a pre-seismic signature related to the Mw5.7 earthquake. Significant anomalous behavior of Bzn* was identified on September 21, with 3 days prior to the onset of the seismic event. Similar information is provided by registrations of the magnetic and electron concentration variations in the ionosphere over the Vrancea zone, by Swarm satellites, 4 days and 1 day before the earthquake.

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Section: Resultscontrasting

confidence: 64%

Pre-seismic geomagnetic and ionosphere signatures related to the Mw5.7 earthquake occurred in Vrancea zone on September 24, 2016

et al. 2018

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“…Several models have been proposed to summarize the main physical mechanisms and the corresponding effects starting from the ground up to the ionosphere/magnetosphere (Gokhberg et al, 1985;Pulinets et al, 2000Pulinets et al, , 2002Sorokin et al, 2001;Molchanov et al, 2004). Characteristic variations in the critical frequency foF2 (Silina et al, 2001), the total electron content (Liu et al, 2004), the ion temperature (Sharma et al, 2006) or the local ion and electron density (Parrot et al, 2006) were found.…”

Section: Models Of Seismic Precursory Phenomenamentioning

confidence: 99%

“…Also disturbances related to nuclear accidents were observed (Ruzhin et al, 1995;Martynenko et al, 1996) and associated to the propagation of acoustic-gravity waves (Row, 1967). More details about these investigations and others are reviewed by Parrot (1995).…”

Section: Introductionmentioning

confidence: 99%

Ionospheric conductivity effects on electrostatic field penetration into the ionosphere

Денисенко

Boudjada

Horn

et al. 2008

Nat. Hazards Earth Syst. Sci.

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Abstract. The classic approach to calculate the electrostatic field penetration, from the Earth's surface into the ionosphere, is to consider the following equation ∇· σ ·∇ =0 whereσ and are the electric conductivity and the potential of the electric field, respectively. The penetration characteristics strongly depend on the conductivities of atmosphere and ionosphere. To estimate the electrostatic field penetration up to the orbital height of DEMETER satellite (about 700 km) the role of the ionosphere must be analyzed. It is done with help of a special upper boundary condition for the atmospheric electric field. In this paper, we investigate the influence of the ionospheric conductivity on the electrostatic field penetration from the Earth's surface into the ionosphere.We show that the magnitude of the ionospheric electric field penetrated from the ground is inverse proportional to the value of the ionospheric Pedersen conductance. So its typical value in day-time is about hundred times less than in night-time.

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“…By studying remote sensing satellite data, researchers have found various abnormal events in the lithosphere, atmosphere and ionosphere prior to large earthquakes, which are reflected in thermal infrared (TIR) anomalies (Gorny et al, 1988;Tronin, 1996;Tramutoli et al, 2005;Pulinets et al, 2006), and ionospheric anomalies (Pulinets and Boyarchuk, 2004;Hayakawa, 2000;Liu et al, 2004;Sarkar et al, 2007;Parrot et al, 2006) prior to the earthquake events. The latest advancements in lithospheric-atmospheric-ionospheric models provide a possible explanation for the origin of these phenomena (Pulinets and Boyarchuk, 2004;Pulinets and Ouzounov, 2011;Liperovsky et al, 2005Liperovsky et al, , 2008Liperovsky et al, , 2011Umarkhodgaev et al, 2012), permitting us to explore possible new studies of the spatial and temporal variability of remote sensing data before and during major earthquakes.…”

Section: Introductionmentioning

confidence: 99%

Detecting seismic IR anomalies in bi-angular Advanced Along-Track Scanning Radiometer data

Xiong

et al. 2013

Nat. Hazards Earth Syst. Sci.

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This paper presents a validation and confutation analysis using the methods of the robust satellite data analysis technique (RST) to detect seismic anomalies within the bi-angular Advanced Along-Track Scanning Radiometer (AATSR) data based on spatial/temporal continuity analysis. The distinguishing feature of our method is that we carried out a comparative analysis of seismic anomalies from bi-directional observation, which could help understanding seismic thermal infrared (TIR) anomalies. The proposed method has been applied to analyse bi-angular AATSR gridded brightness temperature data with longitude from 5 to 25° E and latitude from 35 to 50° N associated with the earthquake that occurred in Abruzzo, Italy, on 6 April 2009, and a full data set of 7 yr data from 2003 to 2009 during the months of March and April has been analysed for validation purposes. Unperturbed periods (March–April 2008) have been considered for confutation analysis. Combining with the tectonic explanation of spatial and temporal continuity of the abnormal phenomena, along with the analysed results, a number of anomalies could be associated with possible seismic activities, which follow the same time and space. Therefore, we conclude that the anomalies observed from 29 March 2009 to 5 April 2009, about eight days before the Abruzzo earthquake, could be earthquake anomalies

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Examples of unusual ionospheric observations made by the DEMETER satellite over seismic regions

Cited by 179 publications

References 13 publications

Pre-seismic geomagnetic and ionosphere signatures related to the Mw5.7 earthquake occurred in Vrancea zone on September 24, 2016

Pre-seismic geomagnetic and ionosphere signatures related to the Mw5.7 earthquake occurred in Vrancea zone on September 24, 2016

Ionospheric conductivity effects on electrostatic field penetration into the ionosphere

Detecting seismic IR anomalies in bi-angular Advanced Along-Track Scanning Radiometer data

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