A. Sharifi; A. Sadidkhouy; F. Rezaie
Abstract
Blasting processes as an essential phase in processing circulation is used in blasting of mines and development operations. Released energy in a blasting of an open mine, in addition to breakdown stones and heat them up, causes propagation of seismic energy around the environment of mine. In order to ...
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Blasting processes as an essential phase in processing circulation is used in blasting of mines and development operations. Released energy in a blasting of an open mine, in addition to breakdown stones and heat them up, causes propagation of seismic energy around the environment of mine. In order to examine the effects of blasting in the mine of Toyserkan Sarabi dam (located 10 km on the east of Toyserkan city), three short period L-4C components recorded on the layer floodgate of dam by the use of some PDAS numerical seismographs with seismometers. By polishing recorded seismograms in the mine area of Toyserkan Sarabi dam, counters of maximum isoparticle velocity for blasting were registrated . Finally, seismic radiation model which is resulted from blasting around the floodgate was provided and the results indicate that the area seismologically is safe and stable.
M. Nemati; D. Hatzfeld; M. R. Gheitanchi; M. Talebian; N. Mirzaei; A. Sadidkhouy
Abstract
The Shahroud fault system plays important role in seismotectonic of the eastern Alborz. In this paper we have surveyed the seismicity of the middle-eastern Alborz and its southern area. At this investigation, the data of the Geological Survey of Iran local seismological networks, the seismological networks ...
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The Shahroud fault system plays important role in seismotectonic of the eastern Alborz. In this paper we have surveyed the seismicity of the middle-eastern Alborz and its southern area. At this investigation, the data of the Geological Survey of Iran local seismological networks, the seismological networks of the Institute of Geophysics of the University of Tehran and the International Institute of Earthquake Engineering and Seismology of Iran were used for processing the focal mechanism of micro-earthquakes and the south of Damghan earthquake and its greatest aftershock. Distribution of the micro-earthquakes and the south of Damghan events epicenters indicate intense activity of the Shahroud fault system and the Toroud fault. Focal mechanisms of them shows near vertical dipping of the faults and left lateral mechanism of the western segments of the fault system and the Toroud fault. The focal mechanisms suggest the Astaneh, Chashm and Firouzkuh faults from the system fault behave in a same manner with no deference between them at depth and have seismic potential proportion to their total length. Also due to left lateral mechanism of the south of Damghan earthquakes, Toroud fault treats like of the eastern Alborz seismotectonically and this area could cover Toroud fault.
