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NEOTECTONIQUE DE LA MONGOLIE OCCIDENTALE ANALYSEE A PARTIR DE DONNEES DE TERRAIN, SISMOLOGIQUES ET SATELLITAIRES

Abstract : Mongolia characterize the transition between compressive structures associated with India-Asia collision and extensive structures from Baykal rift. It suffered, since 1905, four earthquakes with magnitude larger then 8, (Tsetserleg, Bolnay, Fu Yun and Gobi-Altay). Ruptures associated with those earthquakes draw up a parallelogram composed by senestral strike slip faults on an east-west direction and dextral strike slip faults on NNW-SSE direction. Inside this parallelogram, the Hangay dome is associated with normal faults and recent alkaline volcanism.
The source history of these two 1905 earthquakes shows a predominating propagation of the rupture to the east. The Tsetserleg earthquake ruptures (Mw = 7,95 ± 0,02.) may continue beyond the mapped ruptures. The nucleation of Bolnay earthquake (Mw = 8,4 ± 0,1) took place at the intersection between the main fault and the Teregtiin fault.
Ruptures associated with the Gobi-Altay earthquake are complexes and run along the Ikhe Bogdo massif which rotate counterclockwise (24° ± 11° ) since the Miocene. Time recurrence on this fault is around 5000 years with a rate of around 1 mm/year.
The displacement on the Altay and Gobi-Altay conjugates strike slip faults is absorbed on reverse faults, the whole creating compressive wedge. The Hangay dome results from the combination between a mantel up welling and the compressive front associated with India-Asia collision. The Hangay dome rotate clockwise.
The sismicity characterize late aftershocks associated with recent earthquakes. These aftershocks are numerous on segments with vertical slip and few on strike slip segments. A compression oriented N20 ± 10° can explain all deformations indicating the actual preponderance of the compressive front associated to India-Asia collision, preceded by a mantel episode which prepared the region. We propose a model of pure deformation combined with a clockwise rotation in Mongolia.
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https://tel.archives-ouvertes.fr/tel-00155858
Contributor : Antoine Schlupp <>
Submitted on : Tuesday, June 19, 2007 - 5:07:39 PM
Last modification on : Friday, February 5, 2021 - 2:08:03 PM
Long-term archiving on: : Friday, September 21, 2012 - 4:40:16 PM

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Antoine Schlupp. NEOTECTONIQUE DE LA MONGOLIE OCCIDENTALE ANALYSEE A PARTIR DE DONNEES DE TERRAIN, SISMOLOGIQUES ET SATELLITAIRES. Géophysique [physics.geo-ph]. Université Louis Pasteur - Strasbourg I, 1996. Français. ⟨tel-00155858⟩

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