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 fluidfilled (both gas and liquid phases) conduits created by the intersection of NE- A nd NW-trending sets of subvertical 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.
Complex Trace Attributes of High-resolution CRS stacked data to interpret the near-surface-the example of Solfatara Cr / Bruno, P. P.. - (2017).
Complex Trace Attributes of High-resolution CRS stacked data to interpret the near-surface-the example of Solfatara Cr
Bruno, P. P.
2017
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 fluidfilled (both gas and liquid phases) conduits created by the intersection of NE- A nd NW-trending sets of subvertical 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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
