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| Titel |
Is there a one-to-one correspondence between ionospheric anomalies and large earthquakes along Longmenshan faults? |
| VerfasserIn |
L. M. He, L. X. Wu, A. De Santis, S. J. Liu, Y. Yang |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 32, no. 2 ; Nr. 32, no. 2 (2014-02-26), S.187-196 |
| Datensatznummer |
250121032
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| Publikation (Nr.) |
 copernicus.org/angeo-32-187-2014.pdf |
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| Zusammenfassung |
| On 12 May 2008, a destructive M8.0 earthquake struck Wenchuan County
(31.0° N, 103.4° E) in the Longmenshan fault zone of
southwestern China. Five years later, on 20 April 2013, another terrible M7.0
earthquake struck Lushan County (30.3° N, 103.0° E) in the
same fault area, only 87 km away from the epicenter of the Wenchuan
earthquake. In this paper, an integrated wavelet analysis methodology is
proposed to detect and diagnose ionospheric total electron content (TEC)
anomalies related to seismic activities. Analytic wavelet transform is used
to detect ionospheric perturbations, and then cross-wavelet analysis is used
to diagnose ionospheric anomalies by gaining further insights into the
dynamic relationship between the anomaly variability of ionospheric TEC and
geomagnetic indices for the same set of observations. The results show that a
significant ionospheric disturbance occurred on 9 May 2008 above the
forthcoming epicenter, 3 days prior to the Wenchuan earthquake. However, we
did not observe an ionospheric anomaly over the epicenter of the Ya'an
earthquake during the 1 month period before the shock. Finally, we discuss
the possible interpretations of the different seismo-ionospheric effects for
the two similar earthquakes. |
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