10.6084/m9.figshare.3454088.v1
R. T. Walker
R. T.
Walker
K. W. Wegmann
K. W.
Wegmann
A. Bayasgalan
A.
Bayasgalan
R. J. Carson
R. J.
Carson
J. Elliott
J.
Elliott
M. Fox
M.
Fox
E. Nissen
E.
Nissen
R. A. Sloan
R. A.
Sloan
J. M. Williams
J. M.
Williams
E. Wright
E.
Wright
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 of London
2016
Quaternary deposits
fault movements
80 km
Previous researchers
1000 years
palaeoseismic trenches
4 ka
region c
fault length
Egiin Davaa rupture
Egiin Davaa
Egiin Davaa earthquake rupture
Hangay Mountains
scarp height
deforming intraplate
infilled fissures
earthquake ruptures
geomorphological preservation
250 m
Geomorphological reconstructions
500 years
8 m
Geology
2016-06-21 11:53:29
Dataset
https://geolsoc.figshare.com/articles/dataset/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/3454088
<p>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 semi-continuous 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 <em>c.</em> 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 <em>c.</em> 8 m of slip which, along with the observations that it is largely unsegmented along its length and that the ratio of cumulative
slip (<em>c.</em> 250 m) to fault length (<em>c.</em> 80 km) is small, suggests relatively recent reactivation of a pre-existing geological structure.
</p>