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| Titel |
Brief communication "Seismic and acoustic-gravity signals from the source of the 2004 Indian Ocean Tsunami" |
| VerfasserIn |
A. Raveloson, R. Wang, R. Kind, L. Ceranna, X. Yuan |
| 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. 2 ; Nr. 12, no. 2 (2012-02-09), S.287-294 |
| Datensatznummer |
250010497
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| Publikation (Nr.) |
 copernicus.org/nhess-12-287-2012.pdf |
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| Zusammenfassung |
| The great Sumatra-Andaman earthquake of 26 December 2004 caused seismic
waves propagating through the solid Earth, tsunami waves propagating through
the ocean and infrasound or acoustic-gravity waves propagating through the
atmosphere. Since the infrasound wave travels faster than its associated tsunami,
it is for warning purposes very intriguing to study the possibility of
infrasound generation directly at the earthquake source. Garces et al. (2005)
and Le Pichon et al. (2005) emphasized that infrasound was generated
by mountainous islands near the epicenter and by tsunami propagation along
the continental shelf to the Bay of Bengal. Mikumo et al. (2008) concluded
from the analysis of travel times and amplitudes of first arriving
acoustic-gravity waves with periods of about 400–700 s that these waves are
caused by coseismic motion of the sea surface mainly to the west of the
Nicobar islands in the open seas. We reanalyzed the acoustic-gravity waves
and corrected the first arrival times of Mikumo et al. (2008) by up to
20 min. We found the source of the first arriving acoustic-gravity wave about
300 km to the north of the US Geological Survey earthquake epicenter. This
confirms the result of Mikumo et al. (2008) that sea level changes at the
earthquake source cause long period acoustic-gravity waves, which indicate
that a tsunami was generated. Therefore, a denser local network of infrasound
stations may be helpful for tsunami warnings, not only for very large
earthquakes. |
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