Walker, RT;
Wegmann, KW;
Bayasgalan, A;
Carson, RJ;
Elliott, J;
Fox, M;
Nissen, E;
... Wright, E; + view all
(2017)
The egiin davaa prehistoric rupture, central mongolia: A large magnitude normal faulting earthquake on a reactivated fault with little cumulative slip located in a slowly deforming intraplate setting.
Geological Society Special Publications
, 432
pp. 187-212.
10.1144/SP432.4.
Preview |
Text
Fox_187.full.pdf - Published Version Download (18MB) | Preview |
Abstract
The prehistoric Egiin Davaa earthquake rupture is well-preserved in late Quaternary deposits within the Hangay Mountains of central Mongolia. The rupture is expressed by a semicontinuous 80 km-long topographic scarp. Geomorphological reconstructions reveal a relatively constant scarp height of 4-4.5 m and a NW-directed slip vector. Previous researchers have suggested that the scarp's exceptional geomorphological preservation indicates that it may correspond to an earthquake that occurred in the region c. 500 years ago. However, we constrain the last rupture to have been at least 4 ka ago from morphological dating and < 7.4 ka ago based on radiocarbon dating from one of two palaeoseismic trenches. Our study shows that discrete earthquake ruptures, along with details such as the locations of partially infilled fissures, can be preserved for periods well in excess of 1000 years in the interior of Asia, providing an archive of fault movements that can be directly read from the Earth's surface over a timescale appropriate for the study of slowly deforming continental interiors. The Egiin Davaa rupture involved c. 8 m of slip which, along with the observations that it is largely unsegmented along its length and that the ratio of cumulative slip (c. 250 m) to fault length (c. 80 km) is small, suggests relatively recent reactivation of a pre-existing geological structure.
| Type: | Article |
|---|---|
| Title: | The egiin davaa prehistoric rupture, central mongolia: A large magnitude normal faulting earthquake on a reactivated fault with little cumulative slip located in a slowly deforming intraplate setting |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1144/SP432.4 |
| Publisher version: | http://doi.org/10.1144/SP432.4 |
| Language: | English |
| Additional information: | # 2017 The Author(s). Published by The Geological Society of London. This article is published under the terms of the CC-BY 3.0 license. |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Earth Sciences |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10025038 |
Archive Staff Only
 |
View Item |
