Articles | Volume 13, issue 3
https://doi.org/10.5194/se-13-761-2022
https://doi.org/10.5194/se-13-761-2022
Research article
 | 
31 Mar 2022
Research article |  | 31 Mar 2022

Tectonic Geomorphology and Paleoseismology of the Sharkhai fault: a new source of seismic hazard for Ulaanbaatar (Mongolia)

Abeer Al-Ashkar, Antoine Schlupp, Matthieu Ferry, and Ulziibat Munkhuu

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Cited articles

Adiya, M.: Seismic activity near Ulaanbaatar: Implication for seismic hazard assessment, Ph.D. thesis, L'Institut Terre et Environnement de Strasbourg (previously: Institut de Physique du Globe de Strasbourg), France, 256 pp., https://hal.archives-ouvertes.fr/tel-01443798 (last access: 21 March 2022), 2016. 
Al-Ashkar, A.: Tectonique active de la région d'Oulan Bator, Mongolie: Analyse morpho-tectonique et paléosismologique des failles actives de Sharkhai et Avdar, Ph.D. thesis, L'Institut Terre et Environnement de Strasbourg (previously : Institut de Physique du Globe de Strasbourg), France, 360 pp., https://tel.archives-ouvertes.fr/tel-01282438 (last access: 21 March 2022), 2015. 
Bayasgalan, A.: Active tectonics of Mongolia, Ph.D. Thesis, Trinity College Cambridge, 180 pp., https://www.repository.cam.ac.uk/handle/1810/251670 (last access: 21 March 2022), 1999. 
Bayasgalan, A., Jackson, J. A., Ritz, J. F., and Cartier, S.: Field examples of strike-slip fault terminations in Mongolia and their tectonic significance, Tectonics, 18, 394–411, 1999a. 
Bayasgalan, A. and Jackson, J. A.: A re-assessment of the faulting in the 1967 Mogod earthquakes in Mongolia, Geophys. J. Int., 138, 784–800, 1999b. 
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Short summary
We present first constraints for the Sharkhai active fault near the capital city of Mongolia. The fault length is ~ 40 km, and the last earthquake occurred between 775 CE and 1778 CE and the previous between 1605 BCE and 835 BCE. We propose two possible scenarios with likely magnitudes of 6.7 ± 0.2 or 7.1 ± 0.7 and derive preliminary estimates of long-term slip rates. The Sharkhai fault should be considered in the seismic hazard assessment for Ulaanbaatar.