About: Decrease of intensity of ELF/VLF waves observed in the upper ionosphere close to earthquakes: A statistical study

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rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
Description	We present results of a systematic study of intensity of VLF electromagnetic waves observed by the DEMETER spacecraft in the upper ionosphere (altitude 700 km). We focus on the detailed analysis of the previously reported decrease of wave intensity shortly before the main shock during the nighttime. Using a larger set of data (more than 3.5 years of measurements) and a newly developed data processing method, we confirm the existence of a very small but statistically significant decrease of wave intensity 0–4 hours before the time of the main shock at frequencies of about 1.7 kHz. It is shown that the decrease does not occur directly above the earthquake epicenter but is shifted about 2 degrees in the westward direction. Moreover, it is demonstrated that the decrease occurs more often close to shallower earthquakes and close to earthquakes with larger magnitudes, as it is %22intuitively%22 expected, representing an additional proof of validity of the obtained results. We present results of a systematic study of intensity of VLF electromagnetic waves observed by the DEMETER spacecraft in the upper ionosphere (altitude 700 km). We focus on the detailed analysis of the previously reported decrease of wave intensity shortly before the main shock during the nighttime. Using a larger set of data (more than 3.5 years of measurements) and a newly developed data processing method, we confirm the existence of a very small but statistically significant decrease of wave intensity 0–4 hours before the time of the main shock at frequencies of about 1.7 kHz. It is shown that the decrease does not occur directly above the earthquake epicenter but is shifted about 2 degrees in the westward direction. Moreover, it is demonstrated that the decrease occurs more often close to shallower earthquakes and close to earthquakes with larger magnitudes, as it is %22intuitively%22 expected, representing an additional proof of validity of the obtained results. (en)
Title	Decrease of intensity of ELF/VLF waves observed in the upper ionosphere close to earthquakes: A statistical study Decrease of intensity of ELF/VLF waves observed in the upper ionosphere close to earthquakes: A statistical study (en)
skos:prefLabel	Decrease of intensity of ELF/VLF waves observed in the upper ionosphere close to earthquakes: A statistical study Decrease of intensity of ELF/VLF waves observed in the upper ionosphere close to earthquakes: A statistical study (en)
skos:notation	RIV/68378289:_____/09:00330763!RIV10-AV0-68378289
http://linked.open...avai/riv/aktivita	P Z
http://linked.open...avai/riv/aktivity	P(GA205/06/1267), Z(AV0Z30420517), Z(MSM0021620860)
http://linked.open...iv/cisloPeriodika	-
http://linked.open...vai/riv/dodaniDat	2010
http://linked.open...aciTvurceVysledku	Santolík, Ondřej Němec, František
http://linked.open.../riv/druhVysledku	J - Článek v odborném periodiku
http://linked.open...iv/duvernostUdaju	S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů
http://linked.open...titaPredkladatele	Ústav fyziky atmosféry AV ČR, v. v. i.
http://linked.open...dnocenehoVysledku	309221
http://linked.open...ai/riv/idVysledku	RIV/68378289:_____/09:00330763
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	DEMETER; seismo-electromagnetic effects; earthquake prediction (en)
http://linked.open.../riv/klicoveSlovo	DEMETER earthquake prediction seismo-electromagnetic effects
http://linked.open...odStatuVydavatele	US - Spojené státy americké
http://linked.open...ontrolniKodProRIV	[98A63C298672]
http://linked.open...i/riv/nazevZdroje	Journal of Geophysical Research
http://linked.open...in/vavai/riv/obor	BL
http://linked.open...ichTvurcuVysledku	2 (xsd:int)
http://linked.open...cetTvurcuVysledku	3 (xsd:int)
http://linked.open...vavai/riv/projekt	Low-frequency wave coupling of the atmosphere, ionosphere, and inner magnetosphere of the Earth
http://linked.open...UplatneniVysledku	2009
http://linked.open...v/svazekPeriodika	114
http://linked.open...iv/tvurceVysledku	Parrot, M. Santolík, Ondřej Němec, František
http://linked.open...ain/vavai/riv/wos	000264866000003
http://linked.open...n/vavai/riv/zamer	Studium atmosférického obalu Země v interakci s pozemskými a kosmickými vlivy Fyzikální studium objektů a procesů ve sluneční soustavě a v astrofyzikálních systémech
issn	0148-0227
number of pages	10 (xsd:int)
is http://linked.open...avai/riv/vysledek of	Decrease of intensity of ELF/VLF waves observed in the upper ionosphere close to earthquakes: A statistical study Decrease of intensity of ELF/VLF waves observed in the upper ionosphere close to earthquakes: A statistical study Decrease of intensity of ELF/VLF waves observed in the upper ionosphere close to earthquakes: A statistical study Decrease of intensity of ELF/VLF waves observed in the upper ionosphere close to earthquakes: A statistical study

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