Journal
SCIENTIFIC REPORTS
Volume 9, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/s41598-019-49507-0
Keywords
-
Categories
Funding
- French Ministere de la Transtition Ecologique et Solidaire (MTES)
- BRGM
- IPGP
- CNRS-INSU
- EXPLORIS EC FP5
- IPGP Doctoral Scholarship
- CASAVA project [ANR-009-RISK-002]
- ANR DIAPHANE [ANR-14-ce04/0001]
- Service National d'Observation en Volcanologie (SNOV) of INSU-CNRS
- Swiss National Science Foundation
- ANR Diaphane project
- AXA Research Fund
- ERC [ERC-CG-2013-PE10-617472 SLIDEQUAKES]
- CARIB project [ANR-13-BS006-0009]
- Agence Nationale de la Recherche (ANR) [ANR-14-CE04-0001] Funding Source: Agence Nationale de la Recherche (ANR)
Ask authors/readers for more resources
Over the past 9,150 years, at least 9 flank collapses have been identified in the history of La Soufriere of Guadeloupe volcano. On account of the volcano's current unrest, the possibility of such a flank collapse should not be dismissed in assessing hazards for future eruptive magmatic as well as non-magmatic scenarios. We combine morphological and geophysical data to identify seven unstable structures (volumes ranging from 1 x 10(6) m(3) to 100 x 10(6) m(3)), including one that has a volume compatible with the last recorded flank collapse in 1530 CE. We model their dynamics and emplacement with the SHALTOP numerical model and a simple Coulomb friction law. The best-fit friction coefficient to reproduce the 1530 CE event is tan(7 degrees)= 0.13, suggesting the transformation of the debris avalanche into a debris flow, which is confirmed by the texture of mapped deposits. Various friction angles are tested to investigate less water-rich and less mobile avalanches. The most densely populated areas of Saint-Claude and Basse-Terre, and an area of Gourbeyre south of the Palmiste ridge, are primarily exposed in the case of the more voluminous and mobile flank collapse scenarios considered. However, topography has a prominent role in controlling flow dynamics, with barrier effects and multiple channels. Classical mobility indicators, such as the Heim's ratio, are thus not adequate for a comprehensive hazard analysis.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available