Volcano-tectonic control of Merapi's lava dome splitting observed from high resolution TerraSAR-X data

Handle URI:
http://hdl.handle.net/10754/595121
Title:
Volcano-tectonic control of Merapi's lava dome splitting observed from high resolution TerraSAR-X data
Authors:
Luehr, Birger-G.; Walter, Thomas R.; Subandriyo, Joko; Sri Brotopuspito, Kirbani; Vasyura-Bathke, Hannes ( 0000-0002-3826-0663 ) ; Suryanto, Wiwit; Aisyah, Naning; Darmawan, Herlan; Nikkhoo, Mehdi; Richter, Nicole; Jousset, Philippe; Dahm, Torsten
Abstract:
Volcanism at active andesite-dacite volcanoes is often associated with the formation and collapse of circular shaped protrusions of extruded, highly viscous lava, the so-called domes, which are emplaced in the near summit region. Growing domes may experience stable and instable structural phases, with a gradual transition in between. Dome collapse and the break-off of instable blocks of viscous lava may lead to pyroclastic flows, one of the most lethal hazards at stratovolcanoes. At Merapi volcano, Indonesia, nearly 50 % of all eruptions are accompanied by these phenomena. After the climactic eruption in 2010 which left an amphitheater in the summit region, a new dome started growing. Three years later, the dome reached a height of approximately 100 m and diameters of 220 and 190 m with a plateau-like surface area of 40,000m2 approximately. On 18/11/2013, an explosion occurred without identified precursors, leaving a major fracture cutting the complete dome structure. Based on high resolution TerraSAR-X satellite radar imagery, we could identify this linear fracture, traceable over ~200m in the long axis, and up to 40m width. After geocoding of the radar amplitude imagery, the fractures azimuthal trend could be compared to other structural lineaments, indicative of a significant NNW-SSE structural direction that has formed on Merapi volcano in the past. This alignment is also visible in a seismic velocity tomographic imagery for the upper crust, down to 15 km depth. The Merapi dome fractured in a NW-SE direction, and is consistent with the alignment of regional tectonic structures and of anticipated directions of pyroclastic flows. The fracture may be part of a larger volcano-tectonic system and may affect the dynamics and the stability of the Merapi dome.
Conference/Event name:
EGU General Assembly 2015
Issue Date:
Apr-2015
Type:
Presentation
Additional Links:
http://adsabs.harvard.edu/abs/2015EGUGA..1711868L
Appears in Collections:
Presentations

Full metadata record

DC FieldValue Language
dc.contributor.authorLuehr, Birger-G.en
dc.contributor.authorWalter, Thomas R.en
dc.contributor.authorSubandriyo, Jokoen
dc.contributor.authorSri Brotopuspito, Kirbanien
dc.contributor.authorVasyura-Bathke, Hannesen
dc.contributor.authorSuryanto, Wiwiten
dc.contributor.authorAisyah, Naningen
dc.contributor.authorDarmawan, Herlanen
dc.contributor.authorNikkhoo, Mehdien
dc.contributor.authorRichter, Nicoleen
dc.contributor.authorJousset, Philippeen
dc.contributor.authorDahm, Torstenen
dc.date.accessioned2016-01-28T07:13:54Zen
dc.date.available2016-01-28T07:13:54Zen
dc.date.issued2015-04en
dc.identifier.urihttp://hdl.handle.net/10754/595121en
dc.description.abstractVolcanism at active andesite-dacite volcanoes is often associated with the formation and collapse of circular shaped protrusions of extruded, highly viscous lava, the so-called domes, which are emplaced in the near summit region. Growing domes may experience stable and instable structural phases, with a gradual transition in between. Dome collapse and the break-off of instable blocks of viscous lava may lead to pyroclastic flows, one of the most lethal hazards at stratovolcanoes. At Merapi volcano, Indonesia, nearly 50 % of all eruptions are accompanied by these phenomena. After the climactic eruption in 2010 which left an amphitheater in the summit region, a new dome started growing. Three years later, the dome reached a height of approximately 100 m and diameters of 220 and 190 m with a plateau-like surface area of 40,000m2 approximately. On 18/11/2013, an explosion occurred without identified precursors, leaving a major fracture cutting the complete dome structure. Based on high resolution TerraSAR-X satellite radar imagery, we could identify this linear fracture, traceable over ~200m in the long axis, and up to 40m width. After geocoding of the radar amplitude imagery, the fractures azimuthal trend could be compared to other structural lineaments, indicative of a significant NNW-SSE structural direction that has formed on Merapi volcano in the past. This alignment is also visible in a seismic velocity tomographic imagery for the upper crust, down to 15 km depth. The Merapi dome fractured in a NW-SE direction, and is consistent with the alignment of regional tectonic structures and of anticipated directions of pyroclastic flows. The fracture may be part of a larger volcano-tectonic system and may affect the dynamics and the stability of the Merapi dome.en
dc.relation.urlhttp://adsabs.harvard.edu/abs/2015EGUGA..1711868Len
dc.titleVolcano-tectonic control of Merapi's lava dome splitting observed from high resolution TerraSAR-X dataen
dc.typePresentationen
dc.conference.date12-17 April, 2015en
dc.conference.nameEGU General Assembly 2015en
dc.conference.locationVienna, Austriaen
dc.contributor.institutionDeutsches GeoForschungsZentrum GFZ, Section 2.1, Potsdam, Germanyen
dc.contributor.institutionTechnical Research Center for Geological Hazard (BPPTKG), Jalan Cendana 15, Yogyakarta 55166, Indonesiaen
dc.contributor.institutionLaboratory of Geophysics, Department of Physics, Faculty of Mathematics and Naturalen
kaust.authorVasyura-Bathke, Hannesen
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