Integrated geophysical methods for determining geometry of the Kahrizak Fault, Tehran, Iran

Asghar Azadi, Khaled Hessami () and Gholam Javan-Doloei

Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, 2010, vol. 54, issue 3, 813-825

Abstract: Historical studies and geologic investigations show that the Kahrizak fault located at the southern foot of the central Alborz Mountains poses a high seismic risk for the Tehran region. However, little is known about the geometry and mechanism of movement along this seismogenic fault. This paper uses three different geophysical methods namely, seismic refraction, electrical resistivity and magnetic techniques to investigate geometry and sense of motion across the Kahrizak fault in southern Tehran. Although the geoelectric measurements do not show clear anomaly across the fault deep down into the ground, it reveals an obvious anomaly in shallow depths. However, looking at the seismic refraction and magnetic profiles across the Kahrizak scarp, we identified a high angle fault dipping south. This result in conjunction with the local relief across the fault scarp would suggest that the southern block is downthrown with respect to the northern block across a normal fault. Such knowledge can contribute to better evaluate the seismic hazard potential of one of the main seismogenic faults in the Tehran area. Copyright Springer Science+Business Media B.V. 2010

Keywords: Electrical resistivity; Magnetic method; Seismic refraction; Kahrizak Fault; Tehran (search for similar items in EconPapers)
Date: 2010
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DOI: 10.1007/s11069-010-9506-9

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