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| Titel |
Large submarine earthquakes that occurred worldwide in a 1-year period (June 2013 to June 2014) – a contribution to the understanding of tsunamigenic potential |
| VerfasserIn |
R. Omira, D. Vales, C. Marreiros, F. Carrilho |
| 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 Sciences ; 15, no. 10 ; Nr. 15, no. 10 (2015-10-07), S.2183-2200 |
| Datensatznummer |
250119711
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| Publikation (Nr.) |
 copernicus.org/nhess-15-2183-2015.pdf |
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| Zusammenfassung |
| This paper is a contribution to a better understanding of the tsunamigenic
potential of large submarine earthquakes. Here, we analyze the
tsunamigenic potential of large earthquakes which have occurred worldwide with
magnitudes around Mw = 7.0 and greater during a period of 1 year, from
June 2013 to June 2014. The analysis involves earthquake model evaluation,
tsunami numerical modeling, and sensors' records analysis in
order to confirm the generation of a tsunami (or lack thereof) following the occurrence
of an earthquake. We also investigate and discuss the sensitivity of tsunami
generation to the earthquake parameters recognized to control tsunami
occurrence, including the earthquake location, magnitude, focal mechanism
and fault rupture depth. Through this analysis, we attempt to understand why
some earthquakes trigger tsunamis and others do not, and how the earthquake
source parameters are related to the potential of tsunami generation. We
further discuss the performance of tsunami warning systems in detecting
tsunamis and disseminating the alerts. A total of 23 events, with magnitudes
ranging from Mw = 6.7 to Mw = 8.1, have been analyzed. This study shows
that about 39 % of the analyzed earthquakes caused tsunamis that were
recorded by different sensors with wave amplitudes varying from a few
centimeters to about 2 m. Tsunami numerical modeling shows good agreement
between simulated waveforms and recorded waveforms, for some events. On the other
hand, simulations of tsunami generation predict that some of the events,
considered as non-tsunamigenic, caused small tsunamis. We find that most
generated tsunamis were caused by shallow earthquakes (depth < 30 km)
and thrust faults that took place on/near the subduction zones. The
results of this study can help the development of modified and improved versions of
tsunami decision matrixes for various oceanic domains. |
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