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First results of GPS measurements on the Ulaanbaatar geodynamic testing area

A. I. Miroshnichenko, N. A. Radziminovich, A. V. Lukhnev, F. L. Zuev, S. Demberel, D. Erdenezul and M. Ulziibat
First results of GPS measurements on the Ulaanbaatar geodynamic testing area
Russian Geology and Geophysics (August 2018) 59 (8): 1049-1059

Abstract

First results of the analysis of GPS measurement data obtained from 18 sites of two local networks in the vicinity of Ulaanbaatar (Mongolia) for the period 2010-2015 have been presented. Horizontal velocity vectors are consistent with each other in the ITRF2014 system and with the velocities of the IGS permanent station ULAB. The sites move in the E-SE direction at a rate of 25-30 mm/yr, with the displacement azimuth averaging 105 degrees . With respect to Eurasia, the vectors for most of the sites are slightly turned to the south, but they are still of SE orientation with the azimuth range of 130 degrees -150 degrees and magnitude values of 2-4 mm/yr. Relative horizontal velocities tend to decrease towards southeast that determines a zonal distribution of different type of relative strain patterns. The western part of the Ulaanbaatar network is characterized by the W-E oriented extension with the elongation rate epsilon (sub 1) =12-16X10 (super -8) yr (super -1) . The shortening NW-SE trending strain with calculated value epsilon (sub 2) =22.4X10 (super -8) yr (super -1) characterizes the network's eastern part. The highest values of the maximum shear strains (epsilon (sub max) =10-14X10 (super -8) yr (super -1) ) form an extended area in the center of the testing ground, which is elongated in the northeastern direction, conformably with the strike of the major geologic structures. The strain distribution pattern of the Emeelt network located within the eponymous seismogenic structures is characterized by the crustal elongation (5X10 (super -6) yr (super -1) ) trending SE-NW and less pronounced shortening in the SW-SE directions. The axial part of the fault crossing the network in the NW direction exhibits maximum deformations.


ISSN: 1068-7971
Coden: SGGEDF
Serial Title: Russian Geology and Geophysics
Serial Volume: 59
Serial Issue: 8
Title: First results of GPS measurements on the Ulaanbaatar geodynamic testing area
Affiliation: Russian Academy of Sciences, Institute of the Earth's Crust, Irkutsk, Russian Federation
Pages: 1049-1059
Published: 201808
Text Language: English
Publisher: Allerton Press, New York, NY, United States
References: 25
Accession Number: 2022-003807
Categories: Solid-earth geophysicsSeismology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 4 tables, geol. sketch maps
N47°55'00" - N47°55'00", E106°55'00" - E106°55'00"
Secondary Affiliation: Mongolian Academy of Sciences, Institute of Astronomy and Geophysics, MNG, Mongolia
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2022, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 2022

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