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| Titel |
Analysis of pre-earthquake ionospheric anomalies before the global M = 7.0+ earthquakes in 2010 |
| VerfasserIn |
Y. B. Yao, P. Chen, S. Zhang, J. J. Chen, F. Yan, W. F. Peng |
| 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 ; 12, no. 3 ; Nr. 12, no. 3 (2012-03-06), S.575-585 |
| Datensatznummer |
250010602
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| Publikation (Nr.) |
 copernicus.org/nhess-12-575-2012.pdf |
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| Zusammenfassung |
| The pre-earthquake ionospheric anomalies that occurred before the global M = 7.0+
earthquakes in 2010 are investigated using the total electron content (TEC)
from the global ionosphere map (GIM). We analyze the possible causes of the
ionospheric anomalies based on the space environment and magnetic field
status. Results show that some anomalies are related to the earthquakes. By
analyzing the time of occurrence, duration, and spatial distribution of
these ionospheric anomalies, a number of new conclusions are drawn, as
follows: earthquake-related ionospheric anomalies are not bound to appear;
both positive and negative anomalies are likely to occur; and the
earthquake-related ionospheric anomalies discussed in the current study
occurred 0–2 days before the associated earthquakes and in the afternoon to
sunset (i.e. between 12:00 and 20:00 local time). Pre-earthquake
ionospheric anomalies occur mainly in areas near the epicenter. However, the
maximum affected area in the ionosphere does not coincide with the vertical
projection of the epicenter of the subsequent earthquake. The directions
deviating from the epicenters do not follow a fixed rule. The corresponding
ionospheric effects can also be observed in the magnetically conjugated
region. However, the probability of the anomalies appearance and extent of
the anomalies in the magnetically conjugated region are smaller than the
anomalies near the epicenter. Deep-focus earthquakes may also exhibit very
significant pre-earthquake ionospheric anomalies. |
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