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An active ring fault detected at Tendurek volcano by using InSAR

  • Although ring faults are present at many ancient, deeply eroded volcanoes, they have been detected at only very few modern volcanic centers. At the so far little studied Tendurek volcano in eastern Turkey, we generated an ascending and a descending InSAR time series of its surface displacement field for the period from 2003 to 2010. We detected a large (similar to 105km(2)) region that underwent subsidence at the rate of similar to 1cm/yr during this period. Source modeling results show that the observed signal fits best to simulations of a near-horizontal contracting sill located at around 4.5km below the volcano summit. Intriguingly, the residual displacement velocity field contains a steep gradient that systematically follows a system of arcuate fractures visible on the volcano’s midflanks. RapidEye satellite optical images show that this fracture system has deflected Holocene lava flows, thus indicating its presence for at least several millennia. We interpret the arcuate fracture system as the surface expression of anAlthough ring faults are present at many ancient, deeply eroded volcanoes, they have been detected at only very few modern volcanic centers. At the so far little studied Tendurek volcano in eastern Turkey, we generated an ascending and a descending InSAR time series of its surface displacement field for the period from 2003 to 2010. We detected a large (similar to 105km(2)) region that underwent subsidence at the rate of similar to 1cm/yr during this period. Source modeling results show that the observed signal fits best to simulations of a near-horizontal contracting sill located at around 4.5km below the volcano summit. Intriguingly, the residual displacement velocity field contains a steep gradient that systematically follows a system of arcuate fractures visible on the volcano’s midflanks. RapidEye satellite optical images show that this fracture system has deflected Holocene lava flows, thus indicating its presence for at least several millennia. We interpret the arcuate fracture system as the surface expression of an inherited ring fault that has been slowly reactivated during the detected recent subsidence. These results show that volcano ring faults may not only slip rapidly during eruptive or intrusive phases, but also slowly during dormant phases.zeige mehrzeige weniger

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Metadaten
Verfasserangaben:Hannes BathkeORCiDGND, Henriette SudhausORCiDGND, E. P. Holohan, T. R. Walter, M. Shirzaei
DOI:https://doi.org/10.1002/jgrb.50305
ISSN:2169-9313
Titel des übergeordneten Werks (Englisch):JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
Verlag:AMER GEOPHYSICAL UNION
Verlagsort:WASHINGTON
Publikationstyp:Wissenschaftlicher Artikel
Sprache:Englisch
Jahr der Erstveröffentlichung:2013
Erscheinungsjahr:2013
Datum der Freischaltung:26.03.2017
Freies Schlagwort / Tag:Tendurek volcano; arcuate fracture system; caldera subsidence; fault reactivation
Band:118
Ausgabe:8
Seitenanzahl:15
Erste Seite:4488
Letzte Seite:4502
Fördernde Institution:German Ministry of Education and Research (BMBF); Helmholtz Alliance "Remote Sensing and Earth System Dynamics"; GFZ Potsdam; Marie-Curie International Mobility Fellowship; Irish Research Council; Marie-Curie Actions
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