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| Titel |
Characteristics of the summit lakes of Ambae volcano and their potential for generating lahars |
| VerfasserIn |
P. Bani, J.-L. Join, S. J. Cronin, M. Lardy, I. Rouet, E. Garaebiti |
| 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 ; 9, no. 4 ; Nr. 9, no. 4 (2009-08-25), S.1471-1478 |
| Datensatznummer |
250006908
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| Publikation (Nr.) |
 copernicus.org/nhess-9-1471-2009.pdf |
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| Zusammenfassung |
| Volcanic eruptions through crater lakes often generate lahars, causing loss
of life and property. On Ambae volcano, recent eruptive activities have
rather tended to reduce the water volume in the crater lake (Lake Voui), in
turn, reducing the chances for outburst floods. Lake Voui occupies a central
position in the summit caldera and is well enclosed by the caldera relief.
Eruptions with significantly higher magnitude than that of 1995 and 2005 are
required for an outburst. A more probable scenario for lahar events is the
overflow from Lake Manaro Lakua bounded on the eastern side by the caldera
wall. Morphology and bathymetry analysis have been used to identify the
weakest point of the caldera rim from which water from Lake Manaro Lakua may
overflow to initiate lahars. The 1916 disaster described on south-east Ambae
was possibly triggered by such an outburst from Lake Manaro Lakua. Taking
into account the current level of Lake Manaro Lakua well below a critical
overflow point, and the apparently low potential of Lake Voui eruptions to
trigger lahars, the Ambae summit lakes may not be directly responsible for
numerous lahar deposits identified around the Island. |
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