Joint application of ground penetrating radar and electrical resistivity imaging to investigate volcanic materials and structures in Tenerife (Canary Islands, Spain)

Transverse architecture of lahar terraces, inferred from radargrams: preliminary results from Semeru Volcano, Indonesia

“…Baker et al, 1997) and tsunami deposits . Investigations on volcanoes started a few years later, mainly with calibrations against outcrops (Russell and Stasiuk, 1997;Gomez-Ortiz et al, 2007) in order to determine the usability of GPR on volcanic terrain. Gomez-Ortiz et al (2006) also coupled GPR with another geophysical method -electric resistivity imagery -in order to improve and complete retrieved datasets.…”

Block-and-ash flow deposition: A conceptual model from a GPR survey on pyroclastic-flow deposits at Merapi Volcano, Indonesia

“…The method is usually calibrated against outcrops (Russell and Stasiuk, 1997;Gomez-Ortiz et al, 2007) or against other geophysical methods, like ERI -Electric Resistivity Imagery (Gomez-Ortiz et al, 2006). Investigated materials include lava, airfall pumice, channeled and non-channeled pyroclastic flow deposits (Russell and Stasiuk, 1997;Gomez-Ortiz et al, 2007;Gomez et al, 2008), and mud volcanoes (Chow et al, 2006). Despite those developments, volcanic terrains present strong challenges to GPR users because of the significant changes of dielectric properties with the mineralogy, the state of oxidization, etc.…”

Contribution of the geophysical methods in characterizing the water leakage in Afamia B dam, Syria

“…One of the main techniques used to deal with such problems is the geophysical investigations including various modern techniques such as the two dimensional geoelectrical method (tomography), georadar prospecting and magnetic resonance sounding (MRS), which assist obtaining a detailed image of the subsurface structures and water tables (Al-Fares et al, 2002;Beres and Haeni, 1991;Gómez-Ortiz et al, 2007;Grasmueck, 1996;Leucci, 2006;Nguyen et al, 2005;Savvaidis et al, 1999;Sumanovac and Weisser, 2001;Van Schoor, 2002;Vouillamoz et al, 2003;Yaramanci et al, 2002). In fact, the geophysical methods present an effective contribution for outlining the underground structures including caves, fault lineaments and other subsurface structures which are responsible for the majority of water leakage in dams.…”