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Comparing the Role of Absolute Sea-Level Rise and Vertical Tectonic Motions in Coastal Flooding, Torres Islands (Vanuatu), V

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Comparing the Role of Absolute Sea-Level Rise and Vertical Tectonic Motions in Coastal Flooding, Torres Islands (Vanuatu), V Comparing the role of absolute sea-level rise and vertical tectonic motions in coastal flooding, Torres Islands (Vanuatu), V. Ballu, Marie-Noëlle Bouin, Patricia Simeoni, Wayne Crawford, Stéphane Calmant, Jean-Michel Bore, Tony Kanas, Bernard Pelletier To cite this version: V. Ballu, Marie-Noëlle Bouin, Patricia Simeoni, Wayne Crawford, Stéphane Calmant, et al.. Com- paring the role of absolute sea-level rise and vertical tectonic motions in coastal flooding, Torres Islands (Vanuatu),. Proceedings of the National Academy of Sciences of the United States of America , National Academy of Sciences, 2011, 108 (32), pp.13019-13022. 10.1073/pnas.1102842108. hal- 00812620 HAL Id: hal-00812620 https://hal.archives-ouvertes.fr/hal-00812620 Submitted on 22 Apr 2021 HAL is a multi-disciplinary open access L’archive ouverte pluridisciplinaire HAL, est archive for the deposit and dissemination of sci- destinée au dépôt et à la diffusion de documents entific research documents, whether they are pub- scientifiques de niveau recherche, publiés ou non, lished or not. The documents may come from émanant des établissements d’enseignement et de teaching and research institutions in France or recherche français ou étrangers, des laboratoires abroad, or from public or private research centers. publics ou privés. Comparing the role of absolute sea-level rise and vertical tectonic motions in coastal flooding, Torres Islands (Vanuatu) Valérie Ballua,b,1, Marie-Noëlle Bouinc, Patricia Siméonid, Wayne C. Crawforda,b, Stephane Calmante, Jean-Michel Boréf, Tony Kanasg, and Bernard Pelletiera,f aGéoazur, Unité Mixte de Recherche 6526, Institut de Recherche pour le Developpement, Port Vila, Vanuatu; bInstitut de Physique du Globe—Sorbonne Paris Cité, Université Paris Diderot, Unité Mixte de Recherche, Centre National de la Recherche Scientifique 7154, 1 rue Cuvier, 75238 Paris Cedex 05, France; cCentre National de Recherches Météorologiques, Météo France. 13 rue du Chatellier CS 12804, 29228 Brest Cedex 2, France; dGéo-consulte, BP 946, Port Vila, Vanuatu; eLaboratoire d’Etudes en Géophysique et Océanographie Spatiales, Unité Mixte de Recherche 5566, Observatoire Midi Pyrenées, Centre National de la Recherche Scientifique, Toulouse, France; fGéoazur, Unité Mixte de Recherche 6526, Institut de Recherche pour le Developpement, BP A5 Nouméa, New Caledonia; and gLand Survey Department, Luganville, Santo, Vanuatu Edited by Norman H. Sleep, Stanford University, Stanford, CA, and approved June 28, 2011 (received for review February 28, 2011) Since the late 1990s, rising sea levels around the Torres Islands eral hundred meters inland with the aid of the Vanuatu govern- (north Vanuatu, southwest Pacific) have caused strong local and ment and the Canadian International Development Agency in international concern. In 2002–2004, a village was displaced due the framework of a climate change adaptation program. The issue to increasing sea incursions, and in 2005 a United Nations Environ- exploded onto the international scene when a 2005 United Na- ment Programme press release referred to the displaced village tions Environment Programme (UNEP) press release described as perhaps the world’s first climate change “refugees.” We show the Lataw villagers as climate change “refugees,” referring to here that vertical motions of the Torres Islands themselves domi- them as possibly the world’s first community to be “formally nate the apparent sea-level rise observed on the islands. From moved out of harm’s way because of climate change” (see 1997 to 2009, the absolute sea level rose by 150 þ ∕−20 mm. But http://www.unep.org/Documents.Multilingual/Default.Print.asp? GPS data reveal that the islands subsided by 117 þ ∕−30 mm over DocumentID=459&ArticleID=5066&I=en). Pictures of the the same time period, almost doubling the apparent gradual sea- flooded coconut plantation in Loh have circled the world as an level rise. Moreover, large earthquakes that occurred just before example of the effect of climate change (see, for example, the and after this period caused several hundreds of mm of sudden Secretariat of the Pacific Community’s 2009 flyer on Agriculture vertical motion, generating larger apparent sea-level changes than Forestry and Climate Change). those observed during the entire intervening period. Our results show that vertical ground motions must be accounted for when Results evaluating sea-level change hazards in active tectonic regions. Regional sea-level trend maps provided by various organizations – These data are needed to help communities and governments (such as CLS/CNES/LEGOS and NASA) show that, from 1992 8 ∕ understand environmental changes and make the best decisions 2010, the absolute sea level rises at a rate of nearly mm yr for their future. around the Torres Islands (Fig. 3). This trend, which is well above the global average of 3.2 þ ∕−0.4 mm∕yr (4) over the same time geodesy ∣ seismic cycle ∣ island arcs ∣ vertical motion period, is part of a decadal trend of high rise rates in the tropical zone of the western Pacific. The long-term stability of this trend he Torres Islands are located at the northern end of the is not yet confirmed due to the limited duration of the altimetry TVanuatu archipelago, just south of the eastern Solomon series. Tolook at absolute sea-level variations more closely during Islands in the southwest Pacific Ocean. Covering 45 km from the studied period, we use multimission (SSALTO/DUACS) south to north, the six remote inhabited islands of Toga, Loh, altimeter products around the Torres Islands, available from Linua, Tegua, Metoma, and Hiu (Fig. 1) have a total surface area the AVISO (Archiving, Validation and Interpretation of Satellite of 111.8 km2 and a population of 685, according to a 2009 census. Oceanographic data) web site of the French national space These islands belong to the Vanuatu arc, which results from the agency (http://opendap.aviso.oceanobs.com/thredds/dods)(Fig.4). convergence between the Australian and Pacific plates. At the These data show that the sea-level rise rate is even higher from 1997–2009 (12 þ ∕−1. 5 mm∕yr) than from 1992–2010 (7.5 þ ∕− Torres Islands, the Australian plate subducts eastward beneath GEOPHYSICS 0 9 ∕ the Vanuatu arc at a 72 þ ∕−4.3 mm∕yr relative convergence . mm yr). rate (1). While many of the Vanuatu islands are typical subaerial Absolute sea-level rise is tied to a global reference, but the arc volcanoes related to present-day subduction, others, including relative sea-level rise observed at a coast is a combination of this the Torres group, appear to have emerged due to collision-driven absolute rise and the vertical motion of the coastal lands. We uplift (2). The Torres Islands are located much closer to the plate show that the Torres Islands are subject to strong vertical motions boundary than the active volcanoes and have experienced parti- during and in between earthquakes and that the observed sea- cularly strong vertical motion over the past hundred thousand level rise on the Torres Islands is, in fact, dominated by these years, with long-term uplift rates close to 1 mm∕yr (2). These motions. SCIENCES ’ ENVIRONMENTAL islands are regularly struck by strong earthquakes (10 magnitude The Earth s crust is subject to large vertical and horizontal 7þ earthquakes less than 80 km from the islands since 1980), deformations. Some of the strongest movements come from post- which can generate local tsunamis (3). They are also exposed to tele-tsunamis (caused by distant earthquakes) and cyclones. Author contributions: V.B., S.C., and B.P. designed research; V.B., P.S., W.C.C., J.-M.B., and Starting in the late 1990s, villagers became concerned that the T.K. performed research; V.B. and M.-N.B. analyzed data; and V.B. and W.C.C. wrote sea was penetrating deeper and deeper inland during strong the paper. weather. Around the same time, part of a coconut plantation on The authors declare no conflict of interest. Loh Island started gradually flooding with seawater (Fig. 2). In This article is a PNAS Direct Submission. 2002–2004, the village of Lataw on Tegua Island was moved sev- 1To whom correspondence should be addressed. E-mail: [email protected]. www.pnas.org/cgi/doi/10.1073/pnas.1102842108 PNAS ∣ August 9, 2011 ∣ vol. 108 ∣ no. 32 ∣ 13019–13022 Downloaded by guest on April 22, 2021 −13˚00' 8 Earthquake magnitude A B −4000 −6000 50 km 10 km 7.5 −12˚00' 7 Hiu −2000 1957 6.5 7.8 −13˚10' 1980 7.8 Metoma 6 −12˚30' 1980 −8000 2009 8.0 7.8 1997 Tegua 1982 7.9 5.5 7.5 0 Subduction front Earthquake depth (km) Linua −13˚00' −13˚20' 33 2009 7.6 Loh 70 Toga 150 −13˚30' −13˚30' 166˚30' 166˚40' 300 166˚00' 166˚30' 167˚00' 0 100.0 200.0 300.0 Elevation (m) Fig. 1. Location of the study area. (A) Bathymetric map, overlain by magnitude 7.5 + earthquakes since 1900 and magnitude 5.5 + earthquakes since 1973 (USGS catalog). The earthquake circle sizes scale with their magnitude, and their color corresponds to their depth, using the USGS color code. The subduction front marks the boundary between the Australian plate to the west and the North Fiji Basin to the east. (B) Close-up of the Torres Islands. Altimetry data are from NASA ASTER global digital elevation map. glacial rebound and from the seismic cycle. This latter is divided global sea-level rise from tide-gauge data, even after correcting into three phases: interseismic motion, caused by strain accumula- for postglacial rebound (10, 11). In addition, large subduction tion during the loading phase; coseismic motion, which corre- zone earthquakes can cause nearly instantaneous vertical move- sponds to strain release during the earthquake rupture; and ments of up to several meters (see, for example refs.
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