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| Titel |
Analysis of the local lithospheric magnetic activity before and after Panzhihua Mw = 6.0 earthquake (30 August 2008, China) |
| VerfasserIn |
F. Dudkin, V. Korepanov, D. Yang, Q. Li, O. Leontyeva |
| 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 ; 11, no. 12 ; Nr. 11, no. 12 (2011-12-07), S.3171-3180 |
| Datensatznummer |
250009824
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| Publikation (Nr.) |
 copernicus.org/nhess-11-3171-2011.pdf |
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| Zusammenfassung |
Lithospheric ultra low frequency (ULF) magnetic activity is recently
considered as a very promising candidate for application to short-time
earthquake forecasting. However the intensity of the ULF lithospheric
magnetic field is very weak and often masked by much stronger ionospheric
and magnetospheric signals. The study of pre-earthquake magnetic activity
before the occurrence of a strong earthquake is a very hard problem which
consists of the identification and localization of the weak signal sources
in earthquake hazardous areas of the Earth's crust.
For the separation and localization of such sources, we used a new polarization
ellipse technique (Dudkin et al., 2010) to process data acquired from
fluxgate magnetometers installed in the Sichuan province, China. Sichuan is the
region of the strongest seismic activity on the territory of China. During
the last century, about 40 earthquakes with magnitude M ≥ 6.5 happened
here in close proximity to heavy populated zones.
The Panzhihua earthquake Mw = 6.0 happened in the southern part of
Sichuan province on 30 August 2008 at 8:30:52 UT. The earthquake hypocentre
was located at 10 km depth. During the period 30–31 August – the beginning of
September 2008, many clustered aftershocks with magnitudes of up to 5.6 occurred
near the earthquake epicentre.
The data from three fluxgate magnetometers (belonged to China magnetometer
network and placed near to the clustered earthquakes at a distance of
10–55 km from main shock epicenter) have been processed. The separation between
the magnetometers was in the range of 40–65 km.
The analysis of a local lithospheric magnetic activity during the period of
January–December 2008 and a possible source structure have been presented in
this paper. |
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