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High frequency electromagnetic and DC resistivity monitoring system for near real-time earthquake-induced landslides assessment
Global Mtg. Abs. 15, 26 (2011); doi:10.1190/1.3659067
Issue Date: 10 October 2011
ABSTRACT
Dragos Armand Stanica and Dumitru Stanica
Institute of Geodynamics, Romanian Academy, Bucharest, Romania
The objective of this paper is to present the electromagnetic (EM) and electric (DC resistivity) monitoring system that may provide in near real-time the landslide hazard level related to the intermediate depth earthquakes occurring in the seismic active Vrancea zone (Romania). Specific methodologies and software packages have been applied for obtaining all the parameters and to point out their anomalous behavior versus the specific pattern pre-established in non geodynamic conditions. By analyzing the data carried out at the Provita de Sus landslide (test site), placed in Subcarpathians' area at about 100km far from the seismic epicentral zone, it was possible to assign the landslide activity related to the earthquake of M5.0 that occurred in the Vrancea zone on April 25, 2009. Finally, this paper illustrates the stage of the monitoring system implementation and the results highlight the utility of merging the EM precursory parameters (normalised function Bzn, anisotropy, skewness and strike) with 2D resistivity tomographic images related to pre- and post-seismic landslide processes.
©2011 Society of Exploration Geophysicists & Chinese Geophysical Society
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