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Fischanger, Federico
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Fischanger, Federico
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- PublicationOpen Access3‐D Deep Electrical Resistivity Tomography of the Major Basin Related to the 2016 Mw 6.5 Central Italy Earthquake Fault(2021-03-24)
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ;; ; ; ; ; ; ;; ;; ; ;; ; ; We provide the first 3-D resistivity image of the Pian Grande di Castelluccio basin, the main Quaternary depocenter in the hangingwall of the Mt.Vettore–Mt. Bove normal fault system (VBFS), responsible for the October 30, 2016 Mw 6.5 Norcia earthquake (central Italy). The subsurface structure of the basin is poorly known, and its relation with the VBFS remains debated. Using the recent Fullwaver technology, we carried out a high-resolution 2-D transect crossing the 2016 coseismic ruptures coupled with an extensive 3-D survey with the aim of: (a) mapping the subsurface of the basin-bounding splays of the VBFS and the downdip extent of intrabasin faults; (b) imaging the infill and pre-Quaternary substratum down to ∼1 km depth. The 2-D resistivity section highlights under the coseismic ruptures a main dip-slip fault zone with conjugated splays. The 3-D resistivity model suggests that the basin consists of two depocenters (∼300 and ∼600 m deep, respectively) filled with silty sands and gravels (resistivity <300 Ωm), bounded and cross-cut by NNE-, WNW-, and NNW-trending faults with throws of ∼200–400 m. We hypothesize that the NNE-trending system acted during the early basin development, followed by NNW-trending and currently active splays of the VBFS that overprint pre-existing structures and locally control the infill architecture. Moreover, beneath the basin we detect a shallow NW-dipping blind fault. The latter is likely a hangingwall splay of the adjacent regional Mts. Sibillini Thrust, which may have been partly involved in the rupture process of the Norcia mainshock.1425 57 - PublicationOpen Access3D Deep Electrical Resistivity Tomography of the Lusi Eruption Site in East Java(2021-08-26)
; ; ; ; ; ; ; ; ; ; ; 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.313 16