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- Title
3D Deep Electrical Resistivity Tomography of the Lusi Eruption Site in East Java.
- Authors
Mazzini, Adriano; Carrier, Aurore; Sciarra, Alessandra; Fischanger, Federico; Winarto‐Putro, Anton; Lupi, Matteo
- Abstract
Lusi is a sediment‐hosted geothermal system relentlessly erupting since May 2006 in the East Java back‐arc sedimentary basin. Lusi provides the unprecedented opportunity to study the development of the early phases of a new‐born piercement structure and its impact on society. In order to investigate the shallow plumbing system of this large‐scale eruption, we deployed a pool of 25 IRIS V‐Fullwavers to conduct a 3D deep electrical resistivity tomography extending over ∼15 km2 around the eruption site. The inverted data reveal the structure of the subsided area hosting the region where a mix of groundwater, mud breccia, hydrocarbons and boiling hydrothermal fluids are stored. Our investigation also points out the link between a well‐developed fault system and the upwelling of the deep‐seated fluids that initiated, and still drive, the development of the new‐born Lusi eruption. Plain Language Summary: Lusi is the largest erupting clastic system on Earth and is active in the East Java back‐arc sedimentary basin since May the 29th 2006. This spectacular system features a 200 m wide active crater zone surrounded by thousands of satellite seeps that extend over a region of 7 km2. A wealth of geochemical, petrographical, geophysical, and modeling studies revealed that Lusi is connected at depth with the neighboring Arjuno‐Welirang volcanic complex through a system of faults. However, the interaction of these tectonic structures with the shallow depth plumbing system remained so far unknown. Here we present the results of an extensive (15 km2) 3D deep electrical resistivity tomography survey. Results reveal the subsurface morphology of this new‐born eruption and disclose the link between a well‐developed fault system and the upwelling of the deep‐sourced fluids. Key Points: An extensive 3D deep electrical resistivity tomography survey was performed at the Lusi mud eruption, Indonesia, over a region of 15 km2The low resistivity area with active vents and ongoing subsidence (600 × 100 m) is mapped narrowing in size up to 500 m below the surfaceThe Lusi conduit has an ellipsoidal shape controlled by the Watukosek fault system through which upwell the deep‐sourced fluids
- Subjects
PAPUA (Indonesia); INDONESIA; ELECTRICAL resistivity; TOMOGRAPHY; BACK-arc basins; SEDIMENTARY basins; BRECCIA; ELECTRICAL resistance tomography; DATA structures
- Publication
Geophysical Research Letters, 2021, Vol 48, Issue 18, p1
- ISSN
0094-8276
- Publication type
Article
- DOI
10.1029/2021GL092632