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Balassanian, Sergey
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Balassanian, Sergey
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- PublicationOpen AccessRetrospective analysis of the Spitak earthquake(1995-09)
; ; ; ; ; ; ; ; ; ;Balassanian, S. Y.; National Survey of Seismic Protection under the RA Government, Yerevan, Armenia ;Arakelian, A. R.; National Survey of Seismic Protection under the RA Government, Yerevan, Armenia ;Nazaretian, S. N.; National Survey of Seismic Protection under the RA Government, Yerevan, Armenia ;Avanessian, A. S.; National Survey of Seismic Protection under the RA Government, Yerevan, Armenia ;Martirossian, A. H.; National Survey of Seismic Protection under the RA Government, Yerevan, Armenia ;Igoumnov, V. A.; National Survey of Seismic Protection under the RA Government, Yerevan, Armenia ;Melkoumian, M. G.; National Survey of Seismic Protection under the RA Government, Yerevan, Armenia ;Manoukian, A. V.; National Survey of Seismic Protection under the RA Government, Yerevan, Armenia ;Tovmassian, A. K.; National Survey of Seismic Protection under the RA Government, Yerevan, Armenia; ; ; ; ; ; ; ; Based on the retrospective analysis of numerous data and studies of the Spitak earthquake the present work at- tempts to shed light on different aspects of that catastrophic seismic event which occurred in Northern Arme- nia on December 7, 1988. The authors follow a chronological order of presentation, namely: changes in geo- sphere, atmosphere, biosphere during the preparation of the Spitak earthquake, foreshocks, main shock, after- shocks, focal mechanisms, historical seismicity; seismotectonic position of the source, strong motion records, site effects; the macroseismic effect, collapse of buildings and structures; rescue activities; earthquake conse- quences; and the lessons of the Spitak earthquake.246 885 - PublicationOpen AccessSeismic hazard assessment for the Caucasus test area(1999-12)
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ;Balassanian, S.; National Survey for Seismic Protection, Yerevan, Armenia ;Ashirov, T.; Institute of Seismology, Academy of Sciences, Ashkhabad, Turkmenistan ;Chelidze, T.; Institute of Geophysics, Academy of Sciences, Tbilisi, Georgia ;Gassanov, A.; Experimental Methodical Geophysical Expedition, Academy of Sciences, Baku, Azerbaijan ;Kondorskaya, N.; Joint Institute of Physics of the Earth, Moscow, Russia ;Molchan, G.; International Institute of Earthquake Prediction Theory and Mathematical Geophysics, Moscow, Russia ;Pustovitenko, B.; Geophysics Institute, National Academy of Sciences, Kiev, Ukraine ;Trifonov, V.; Joint Institute of Physics of the Earth, Moscow, Russia ;Ulomov, V.; Joint Institute of Physics of the Earth, Moscow, Russia ;Giardini, D.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione CNT, Roma, Italia ;Erdik, M.; Bogazici University, Kandilli Observatory, Istanbul, Turkey ;Ghafory-Ashtiany, M.; International Institute of Earthquake Engineering and Seismology, Teheran, Iran ;Grünthal, G.; GeoForschungsZentrum, Potsdam, Germany ;Mayer-Rosa, D.; Institute of Geophysics, ETH Zurich, Switzerland ;Schenk, V.; Institute of Rock Mechanics, Academy of Sciences, Prague, Czech Republic ;Stucchi, M.; Istituto di Ricerca sul Rischio Sismico, Milano, Italy; ; ; ; ; ; ; ; ; ; ; ; ; ; ; The GSHAP CAUCAS test area was established under the INTAS Ct.94-1644 (Test Area for sismic Hazard Assessment in the Caucasus) and NATO ARW Ct.95-1521 (Historical and Prehistorical Earthquakes in the Caucasus), with the initial support of IASPEI, UNESCO and ILP. The high tectonic interest and seismicity rate of the whole area, the availability of abundant multi-disciplinary data and the long established tradition in hazard assessment provide a unique opportunity to test different methodologies in a common test area and attempt to establish some consensus in the scientific community. Starting from the same input data (historical and instrumental seismic catalogue, lineament and homogeneous seismic source models) six independent approaches to seismic hazard assessment have been used, ranging from pure historical deterministic to seismotectonic probabilistic and areal assessment methodologies. The results are here compared.881 482 - PublicationOpen AccessThe investigation of electromagnetic precursors to earthquakes in Armenia(1997-03)
; ; ; ; ; ; ;Balassanian, S.; National Survey for Seismic Protection, Republic of Armenia, Yerevan, Armenia ;Mouradian, A.; National Survey for Seismic Protection, Republic of Armenia, Yerevan, Armenia ;Sahakian, A.; National Survey for Seismic Protection, Republic of Armenia, Yerevan, Armenia ;Kalinin, S.; National Survey for Seismic Protection, Republic of Armenia, Yerevan, Armenia ;Babayan, M.; National Survey for Seismic Protection, Republic of Armenia, Yerevan, Armenia ;Pogossian, A.; National Survey for Seismic Protection, Republic of Armenia, Yerevan, Armenia; ; ; ; ; The present work provides a sufficient theoretical substantiation of the anomalous distribution for Very-Low-Frequency (VLF) radio waves which is observed for all radio routes controlled by the National Survey for Seismic Protection (NSSP) of the Republic of Armenia. This event is connected with the ionosphere excitement over the strong seismic event preparation zone under the influence of intensively oscillated VLF electromagnetic waves falling on the ionosphere from the source called an area of uniformly oriented Zones of Separated Charges (ZSC) in the strong seismic preparation zone. ZSC, formed at the interfaces of solid, liquid, and gaseous phases of rocks, acquire identical orientation under the action of increasing elastic strain forces. These strain forces may cause the effect of mutual polarisation of ZSC in the field of their high concentration. As a result, in the strong earthquake preparation zone, the most sensitive to the deformation ZSC, non-linear electromagnetic effects may be observed. One of these effects is the irreversibility of non-stationary electromagnetic processes (INP). It is shown that the INP method developed by Balassanian and Kabilsky (Balassanian, 1990) may prove to be very sensitive to the deformations of geological medium in the earthquake preparation zone.159 164