Abstract
Earthquakes usually occur after some preliminary anomalies in the physical and chemical characteristics of environment and earth interior. Construction of the models which can explain these anomalies, prompt scientists to monitor geophysical and geochemical characteristics in the seismic areas for earthquake prediction. A review of studies has been done so far, denoted that radon gas shows more sensitivity than other geo-gas as a precursor. Based on previous researches, radon is a short-term precursor of earthquake from time point of view. There are equal experimental equations about the relation between earthquake magnitude and its effective distance on radon concentration variations. In this work, an algorithm based on Dobrovolsky equation \( (D = 10^{0.43M} ) \) with defining the Expectation and Investigation circles for great Tehran has been used. Radon concentration was measured with RAD7 detector in the more than 40 springs. Concentration of radon in spring, spring discharge, water temperature and the closeness of spring location to active faults, have been considered as the significant factors to select the best spring for a radon continuous monitoring site implementation. According to these factors, thirteen springs have been selected as follow: Bayjan, Mahallat-Hotel, Avaj, Aala, Larijan, Delir, Lavij, Ramsar, Semnan, Lavieh, Legahi, Kooteh-Koomeh and Sarein.
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Notes
International Association of Seismology and Physics of the Earth's Interior (www.iaspei.org).
Tehran, Mazandaran, Ardebil, Markazi, Zanjan, Semnan & Gilan.
The study region is full of different type faults (Dip slip, strike slip and oblique slip faults/Normal and Reverse faults/High angle and low angle faults/and any other classification of faults). But the above descriptions of faults are only based on seismicity rate of each one during the time and other factors of faults were not studied.
International Institute of Earthquake Engineering & Seismology (www.iiees.ac.ir).
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Negarestani, A., Namvaran, M., Shahpasandzadeh, M. et al. Design and investigation of a continuous radon monitoring network for earthquake precursory process in Great Tehran. J Radioanal Nucl Chem 300, 757–767 (2014). https://doi.org/10.1007/s10967-014-3020-6
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DOI: https://doi.org/10.1007/s10967-014-3020-6