In this work, we study the subsidence of Dallol, an explosive crater and hydrothermal area along the spreading Erta Ale ridge of Afar (Ethiopia). No volcanic products exist at the surface. However, a diking episode in 2004, accompanied by dike-induced faulting, indicates that Dallol is an active volcanic area. The 2004 diking episode was followed by quiescence until subsidence started in 2008. We use InSAR to measure the deformation, and inverse, thermoelastic and poroelastic modelling to understand the possible causes of the subsidence. Analysis of InSAR data from 2004–2010 shows that subsidence, centered at Dallol, initiated in October 2008, and continued at least until February 2010 at an approximately regular rate of up to 10 cm/year. The inversion of InSAR average velocities finds that the source causing the subsidence is shallow (depth between 0.5 and 1.5 km), located under Dallol and with a volume decrease between 0.63 and 0.26 106 km3/year. The most likely explanation for the subsidence of Dallol volcano is a combination of outgassing (depressurization), cooling and contraction of the roof of a shallow crustal magma chamber or of the hydrothermal system.

The 2008–2010 subsidence of Dallol Volcano on the spreading Erta Ale Ridge. InSAR observations and source models / Battaglia, Maurizio; Pagli, Carolina; Meuti, Stefano. - In: REMOTE SENSING. - ISSN 2072-4292. - 13:10(2021). [10.3390/rs13101991]

The 2008–2010 subsidence of Dallol Volcano on the spreading Erta Ale Ridge. InSAR observations and source models

Battaglia, Maurizio
Primo
Conceptualization
;
2021

Abstract

In this work, we study the subsidence of Dallol, an explosive crater and hydrothermal area along the spreading Erta Ale ridge of Afar (Ethiopia). No volcanic products exist at the surface. However, a diking episode in 2004, accompanied by dike-induced faulting, indicates that Dallol is an active volcanic area. The 2004 diking episode was followed by quiescence until subsidence started in 2008. We use InSAR to measure the deformation, and inverse, thermoelastic and poroelastic modelling to understand the possible causes of the subsidence. Analysis of InSAR data from 2004–2010 shows that subsidence, centered at Dallol, initiated in October 2008, and continued at least until February 2010 at an approximately regular rate of up to 10 cm/year. The inversion of InSAR average velocities finds that the source causing the subsidence is shallow (depth between 0.5 and 1.5 km), located under Dallol and with a volume decrease between 0.63 and 0.26 106 km3/year. The most likely explanation for the subsidence of Dallol volcano is a combination of outgassing (depressurization), cooling and contraction of the roof of a shallow crustal magma chamber or of the hydrothermal system.
2021
volcano deformation; interferometric synthetic aperture radar; ground deformation modelling; volcano geodesy
01 Pubblicazione su rivista::01a Articolo in rivista
The 2008–2010 subsidence of Dallol Volcano on the spreading Erta Ale Ridge. InSAR observations and source models / Battaglia, Maurizio; Pagli, Carolina; Meuti, Stefano. - In: REMOTE SENSING. - ISSN 2072-4292. - 13:10(2021). [10.3390/rs13101991]
File allegati a questo prodotto
File Dimensione Formato  
Battaglia_Subsidence_2021.pdf

accesso aperto

Tipologia: Versione editoriale (versione pubblicata con il layout dell'editore)
Licenza: Tutti i diritti riservati (All rights reserved)
Dimensione 4.74 MB
Formato Adobe PDF
4.74 MB Adobe PDF

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1548544
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 7
  • ???jsp.display-item.citation.isi??? 7
social impact