Full text loading...
-
Complex Trace Attributes of High-resolution CRS Stacked Data to Interpret the Near-Surface - The Example of Solfatara Cr
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 23rd European Meeting of Environmental and Engineering Geophysics, Sep 2017, Volume 2017, p.1 - 5
Abstract
Two active-source, high-resolution seismic profiles were acquired in the Solfatara tuff cone in May and November 2014, with dense, wide aperture arrays which allowed recording multi-fold reflection data spanning a large range of offsets; deep penetrating refracted waves, suitable for first-arrival travel time tomography, and surface waves. The reflection profiles provide the first high-resolution seismic images of Solfatara crater, depicting a ∼400m deep asymmetrical structure filled by volcanoclastic sediments and rocks. Seismic reflection data were interpreted using trace complex attributes which clearly locate several narrow (less than 10 m thick) areas with distinctive anomalous low amplitudes in several areas within the crater. We interpreted them as fluid-filled (both gas and liquid phases) conduits created by the intersection of NE- and NW-trending sets of sub-vertical faults. The imaged degassing pathways terminate against strong-amplitude zones created by reduction of porosity that occurs at about 100 m from crater surface and generates a high impedance contrast between fluid and dry soils.