Retrieving 65 years of volcano summit deformation from multi-temporal Structure-from-Motion: the case of Piton de la Fournaise (La Réunion Island). | INSTITUT DE PHYSIQUE DU GLOBE DE PARIS

Twitter

Aller au compte twitter

  Retrieving 65 years of volcano summit deformation from multi-temporal Structure-from-Motion: the case of Piton de la Fournaise (La Réunion Island).

Type de publication:

Journal Article

Source:

Geophysical Research Letters, Ticket 42 (2015)

Autre numéro:

DOI: 10.1002/2015GL064820

URL:

https://www.researchgate.net/publication/281193942_Retrieving_65_years_of_volcano_summit_deformation_from_multi-temporal_Structure-from-Motion_the_case_of_Piton_de_la_Fournaise_La_Reunion_Island

Mots-clés:

Cross correlation, Historical imagery, Strcuture from Motion, Volcano deformation

Résumé:

<p><span class="foldable-text" data-reactid="130" id="yui_3_14_1_1_1484222034513_556"><span class="text-with-line-breaks" id="yui_3_14_1_1_1484222034513_573"><span id="yui_3_14_1_1_1484222034513_572">“An edited version of this paper was published by AGU. Copyright 2015 American Geophysical Union.”</span><br><br><span>The structure-from-Motion photogrammetry technique enables use of historical airborne photography to achieve high-resolution 3D terrain models. We apply this method on Piton de la Fournaise volcano (La Réunion), which allows a unique opportunity to retrieve high-resolution (1.5-0.11 m) Digital Elevation Models and precise deformation maps of the volcano since 1950. Our results provide evidence that the summit volume increased throughout the study period, at a stable rate of 2.2 Mm3/yr between 1950 and 2000, increasing by a factor of four (to 8.0Mm3/yr) prior to the major 2007 eruption which was accompanied by summit caldera collapse. At the same time, summit deformation was asymmetric, with 9.2±2.5 m of eastward seaward displacement, and 1.3±2.5 m to the west during 1950-2015. Our results reveal a temporal evolution in the volcano magma influx rate and deformation. Tracking these fluxes and the long-lived preferential eastern motion is crucial to mitigate risks associated to flank destabilization.</span></span></span></p>