DOI: 10.1016/j.epsl.2017.10.007
Scopus记录号: 2-s2.0-85042162054
论文题名: Active convergence between the Lesser and Greater Caucasus in Georgia: Constraints on the tectonic evolution of the Lesser–Greater Caucasus continental collision
作者: Sokhadze G. ; Floyd M. ; Godoladze T. ; King R. ; Cowgill E.S. ; Javakhishvili Z. ; Hahubia G. ; Reilinger R.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2018
卷: 481 起始页码: 154
结束页码: 161
语种: 英语
英文关键词: Caucasus
; deformation
; GPS
; seismic hazards
; Tbilisi, Georgia
Scopus关键词: Deformation
; Geodetic satellites
; Global positioning system
; Hazards
; Seismic response
; Seismology
; Caucasus
; Continental collisions
; Geodetic observation
; Georgia
; Greater Caucasus
; Seismic hazards
; Strain accumulations
; Tectonic evolution
; Faulting
; active margin
; continental collision
; convergence
; deformation
; earthquake event
; GPS
; seismic hazard
; tectonic evolution
; Caucasus
; Georgia (republic)
; Tbilisi
英文摘要: We present and interpret newly determined site motions derived from GPS observations made from 2008 through 2016 in the Republic of Georgia, which constrain the rate and locus of active shortening in the Lesser–Greater Caucasus continental collision zone. Observation sites are located along two ∼160 km-long profiles crossing the Lesser–Greater Caucasus boundary zone: one crossing the Rioni Basin in western Georgia and the other crossing further east near the longitude of Tbilisi. Convergence across the Rioni Basin Profile occurs along the southern margin of the Greater Caucasus, near the surface trace of the north-dipping Main Caucasus Thrust Fault (MCTF) system, and is consistent with strain accumulation on the fault that generated the 1991 MW6.9 Racha earthquake. In contrast, convergence along the Tbilisi Profile occurs near Tbilisi and the northern boundary of the Lesser Caucasus (near the south-dipping Lesser Caucasus Thrust Fault), approximately 50–70 km south of the MCTF, which is inactive within the resolution of geodetic observations (<±0.5 mm/yr) at the location of the Tbilisi Profile. We suggest that the southward offset of convergence along strike of the range is related to the incipient collision of the Lesser–Greater Caucasus, and closing of the intervening Kura Basin, which is most advanced along this segment of the collision zone. The identification of active shortening near Tbilisi requires a reevaluation of seismic hazards in this area. © 2017 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/110183
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: Institute of Earth Sciences, Ilia State University, Tbilisi, Georgia; Dept. of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA, United States; Dept. of Earth & Planetary Sciences, University of California, Davis, CA, United States; National Agency of Public Registry, Tbilisi, Georgia
Recommended Citation:
Sokhadze G.,Floyd M.,Godoladze T.,et al. Active convergence between the Lesser and Greater Caucasus in Georgia: Constraints on the tectonic evolution of the Lesser–Greater Caucasus continental collision[J]. Earth and Planetary Science Letters,2018-01-01,481