Comparing the role of absolute sea-level rise and vertical tectonic motions in coastal flooding, Torres Islands (Vanuatu)

Since the late 1990s, rising sea levels around the Torres Islands (north Vanuatu, southwest Pacific) have caused strong local and international concern. In 2002-2004, a village was displaced due to increasing sea incursions, and in 2005 a United Nations Environment Programme press release referred t...

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Veröffentlicht in:Proceedings of the National Academy of Sciences - PNAS 2011-08, Vol.108 (32), p.13019-13022
Hauptverfasser: Ballu, Valérie, Bouin, Marie-Noëlle, Siméoni, Patricia, Crawford, Wayne C, Calmant, Stephane, Boré, Jean-Michel, Kanas, Tony, Pelletier, Bernard
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container_end_page 13022
container_issue 32
container_start_page 13019
container_title Proceedings of the National Academy of Sciences - PNAS
container_volume 108
creator Ballu, Valérie
Bouin, Marie-Noëlle
Siméoni, Patricia
Crawford, Wayne C
Calmant, Stephane
Boré, Jean-Michel
Kanas, Tony
Pelletier, Bernard
description Since the late 1990s, rising sea levels around the Torres Islands (north Vanuatu, southwest Pacific) have caused strong local and international concern. In 2002-2004, a village was displaced due to increasing sea incursions, and in 2005 a United Nations Environment Programme press release referred to the displaced village as perhaps the world's first climate change "refugees." We show here that vertical motions of the Torres Islands themselves dominate the apparent sea-level rise observed on the islands. From 1997 to 2009, the absolute sea level rose by 150 + /-20 mm. But GPS data reveal that the islands subsided by 117 + /-30 mm over the same time period, almost doubling the apparent gradual sea-level rise. Moreover, large earthquakes that occurred just before and after this period caused several hundreds of mm of sudden vertical motion, generating larger apparent sea-level changes than those observed during the entire intervening period. Our results show that vertical ground motions must be accounted for when evaluating sea-level change hazards in active tectonic regions. These data are needed to help communities and governments understand environmental changes and make the best decisions for their future.
doi_str_mv 10.1073/pnas.1102842108
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subjects Climate change
Comparative analysis
Earth Sciences
Earthquakes
Flooding
Floods
Geography
Global positioning systems
Islands
Motion
Oceans
Physical Sciences
Plantations
Plate tectonics
refugees
Satellite Communications
Sciences of the Universe
Sea level
Sea level rise
Seawater
Seismic activity
Social Sciences
Subduction zones
Subsidence
tectonics
United Nations
United Nations Environment Programme
Vanuatu
Vertical motion
villages
Water Movements
title Comparing the role of absolute sea-level rise and vertical tectonic motions in coastal flooding, Torres Islands (Vanuatu)
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