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Itkis S.E.,Ben - Gurion University of the Negev | Frid V.,Isotop LTD | Sokolova T.B.,Moscow State University
Near Surface Geoscience 2012 | Year: 2012

Geophysical studies included detailed magnetic prospecting and Electrical Resistivity Tomography(ERT) survey were performed for revealing and tracing near-surface archaeological remains in Tel 'En Gev. Since the surveyed areas are located in close vicinity of kibbutz 'En Gev living areas, desired magnetic signal is strongly affected by artificial and environmental disturbances. This complicates magnetic data interpretation. The ERT results free of such influences successfully supplement the magnetic data and allowed us to clear up the sources of the magnetic anomalies and evaluate their size and depth. Source

Frid V.,Isotop LTD | Goldbaum J.,Technological College | Rabinovitch A.,Ben - Gurion University of the Negev | Bahat D.,Ben - Gurion University of the Negev
Philosophical Magazine | Year: 2011

New time-dependent Benioff strain (TDBS) release diagrams were analyzed for acoustic emission during various loading tests and for electromagnetic (EM) radiation emanating during compression and, tension, which end in failure. TDBS diagrams are Benioff diagrams that are built consecutively, each time using a greater number of events (acoustic or EM emissions) using the last event as if it were associated with the 'actual failure'. An examination of such TDBS diagrams shows that at a certain time point (this time point is denoted by the term 'alarm' time), a comparatively short interval prior to actual collapse, their decreasing part is broken by a positive 'bulge'. This 'bulge' is quantified and an algorithm proposed for its assessment. Using the alarm time and other parameters of the failure process (fall, bulge size and escalation factors, bulge slope and slope fall time), a criterion for estimating the time of the actual collapse is developed and shown to agree well with laboratory experimental results. © 2011 Taylor & Francis. Source

Frid V.,Isotop LTD | Doudkinski D.,Isotop LTD | Liskevich G.,Isotop LTD | Shafran E.,Isotop LTD | And 3 more authors.
Environmental Earth Sciences | Year: 2010

This paper deals with the integration of electrical resistivity tomography and geochemical methods for studying four different fire-prone landfills. Landfill gas composition (CH4, H2S, O2, CO, CO2) and subsurface temperature were measured with the constant net 50 × 50 m from the depth 10-60 cm. 28 electrical resistivity tomography lines were surveyed, while Wenner and Sclumberger electrode arrays were employed for all measurements. At the studied sites the landfill gas and temperature measurements mapped gas and temperature anomalies over underground fire sources. 2D electrical resistivity tomography lines, performed over these anomalies, showed these fire sources as high-resistivity zones. The joint employment of the electrical imaging and geochemical survey seems to be a useful tool in carrying out diagnostic investigations at fire-prone landfills. © 2009 Springer-Verlag. Source

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