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| Titel |
Ionospheric quasi-static electric field anomalies during seismic activity in August–September 1981 |
| VerfasserIn |
M. Gousheva, D. Danov, P. Hristov, M. Matova |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1561-8633
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| Digitales Dokument |
URL |
| Erschienen |
In: Natural Hazards and Earth System Science ; 9, no. 1 ; Nr. 9, no. 1 (2009-01-05), S.3-15 |
| Datensatznummer |
250006602
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| Publikation (Nr.) |
 copernicus.org/nhess-9-3-2009.pdf |
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| Zusammenfassung |
| The paper proposes new results, analyses and information for the plate
tectonic situation in the processing of INTERCOSMOS-BULGARIA-1300 satellite
data about anomalies of the quasi-static electric field in the upper
ionosphere over activated earthquake source regions at different latitudes.
The earthquake catalogue is made on the basis of information from the United
State Geological Survey (USGS) website. The disturbances in ionospheric
quasi-static electric fields are recorded by IESP-1 instrument aboard the
INTERCOSMOS-BULGARIA-1300 satellite and they are compared with significant
seismic events from the period 14 August–20 September 1981 in magnetically
very quiet, quiet and medium quiet days. The main tectonic characteristics
of the seismically activated territories are also taken in account. The main
goal of the above research work is to enlarge the research of possible
connections between anomalous vertical electric field penetrations into the
ionosphere and the earthquake manifestations, also to propose tectonic
arguments for the observed phenomena. The studies are represented in four
main blocks: (i) previous studies of similar problems, (ii) selection of
satellite, seismic and plate tectonic data, (iii) data processing with new
specialized software and observations of the quasi-static electric field and
(iiii) summary, comparison of new with previous results in our studies and
conclusion. We establish the high informativity of the vertical component
Ez of the quasi-static electric field in the upper
ionosphere according observations by INTERCOSMOS-BULGARIA-1300 that are
placed above considerably activated earthquake sources. This component shows
an increase of about 2–10 mV/m above sources, situated on mobile structures
of the plates. The paper discusses the observed effects. It is represented
also a statistical study of ionospheric effects 5–15 days before and 5–15
days after the earthquakes with magnitude M 4.8–7.9. |
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