eprintid: 2183
rev_number: 10
eprint_status: archive
userid: 2
dir: disk0/00/00/21/83
datestamp: 2019-01-23 14:43:05
lastmod: 2019-01-23 14:43:05
status_changed: 2019-01-23 14:43:05
type: article
metadata_visibility: show
creators_name: Plotnikova, L. M.
creators_name: Nurtaev, B. S.
creators_name: Grasso, Jean-Robert
creators_name: Matasova, L. M.
creators_name: Bossu, Remy
corp_creators: Institute of Geology and GeophysicsTashkentUzbekistan
corp_creators: Institute of SeismologyAcademy of Sciences of UzbekistanUzbekistan
corp_creators: LGIT, IRIGMUniversité Joseph FourierGrenobleFrance
corp_creators: Institute of Geology and GeophysicsTashkentUzbekistan
corp_creators: LGIT, IRIGMUniversité Joseph FourierGrenobleFrance
title: The character and extent of seismic deformation in the focal zone of gazli earthquakes of 1976 and 1984,M>7.0
subjects: MP1
subjects: MP2
subjects: RUZ
subjects: SHC
divisions: IP17
full_text_status: none
abstract: With objective of investigating the peculiarities of seismic process development and seismotectonic deformation character in the focal area of the Gazli earthquakes of 1976 (7.0<M<7.3) and 1984 (M=7.2), a local seismic network was installed. For the field observation period (May to June, 1991) more than 400 events with magnitudes −0.2<M<4.5 were recorded by at least 6 stations.

Isometric presentation of earthquake hypocenters distribution allows us to define the depth and dipping planes orientation of seismoactive faults of the region.

The focal mechanisms of 35 earthquakes for the period 1979–1988,M>2.8, connected to a gas extraction regime period, and 75 events 1<M<4.3 for the 1991 period (gas storage regime) are used to analyze the dynamics of seismotectonic deformation processes (SDP) in this region. It has been ascertained, that the earth's crust in the Gazli region is subject to complicated deformation processes, particularly below 4 km depth. The predominant kind of deformation is compression. Vertical velocities of deformation show uplift of most of the region during the period of field work. The maximum velocity of vertical deformations for the Gazli structure isV=0.41 mm/year. The comparison of the vertical velocities' displacements due to seismic flow with recent tectonic movements of the earth's crust has revealed their direct relation and high percentage of seismic flow contribution to the tectonic movement. The results obtained testify that the active seismic processes in the Gazli region are connected not as much as the residual stress release in the focal zone of the earthquakes 05. 1976 and 1984,M>7.0 but rather with the influence of the gas reservoir exploitational regime on the rocks with different rheologic properties.
date: 1996
publication: Pure and Applied Geophysics
volume: 147
number: 2
publisher: Springer Verlag
pagerange: 377-387
id_number: doi:10.1007/BF00877490
issn: 0033-4553
official_url: http://doi.org/10.1007/BF00877490
access_IS-EPOS: limited
owner: Publisher
citation:   Plotnikova, L. M. and Nurtaev, B. S. and Grasso, Jean-Robert and Matasova, L. M. and Bossu, Remy  (1996) The character and extent of seismic deformation in the focal zone of gazli earthquakes of 1976 and 1984,M>7.0.  Pure and Applied Geophysics, 147 (2).  pp. 377-387. DOI: https://doi.org/10.1007/BF00877490 <https://doi.org/10.1007/BF00877490>