Engineering and Seismometric Service in the Buildings of Tashkent and Tashkent Regions

Tashkent city is located in the zone where I=8–9 (Mercalli intensity scale) and some faults are in the adjoining regions. Microseismozoning carried out with due regard for the soil conditions showed that there are areas on the city territory where I=7,8,9 and areas exposed to landslides and dilution of soil under earthquakes. The buildings constructed in Tashkent are of different constructive schemes. Stations of engineering and seismometric service (SESS) are located in the 20-storeyed panel administrative building, in the 9-storeyed dwelling house of a special construction, in the 4-storeyed brick building of the Hotel Tashkent, in the 5-storeyed brick buildings of research institutes, in the 17-storeyed building of the Hotel Uzbekistan. Seismodetectors are installed in ground and on different levels inside these constructions.The stations record ground motions caused by earthquakes if I>4. Equipment of these stations was constructed in the former Soviet Union and is obsolete at present. Besides that tracking of underground communications and the Metro where SESS has been installed is also carried out. The Charvak reservoir whose water storage reach 2 milliard cubic metres is at 60 km distance from Tashkent. Dam of the reservoir is in the vicinity of a seismic fault. If the dam whose altitude is 167 m is destroyed the Tashkent oasis will be flooded. Detectors have been incorporated into the dam and seismometric service was organised. At present equipment of the station is obsolete but is in a serviceable condition.Ground motions recorded by these SESS were used for improvement of the map of microseismozoning, Constructive Standards and Regularities and for calculation of city buildings for seismic stability. Now organisation of common network for seismometric control in Tashkent and Tashkent regions, use of new-type machinery for registration of strong ground motion caused by earthquakes are actual.