TY - DATA T1 - 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 PY - 2016/06/21 AU - R. T. Walker AU - K. W. Wegmann AU - A. Bayasgalan AU - R. J. Carson AU - J. Elliott AU - M. Fox AU - E. Nissen AU - R. A. Sloan AU - J. M. Williams AU - E. Wright UR - 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 DO - 10.6084/m9.figshare.3454088.v1 L4 - https://ndownloader.figshare.com/files/5424881 L4 - https://ndownloader.figshare.com/files/5424884 L4 - https://ndownloader.figshare.com/files/5424887 L4 - https://ndownloader.figshare.com/files/5424890 L4 - https://ndownloader.figshare.com/files/5424893 L4 - https://ndownloader.figshare.com/files/5424896 L4 - https://ndownloader.figshare.com/files/5424899 L4 - https://ndownloader.figshare.com/files/5424902 L4 - https://ndownloader.figshare.com/files/5424905 L4 - https://ndownloader.figshare.com/files/5424908 L4 - https://ndownloader.figshare.com/files/5424911 L4 - https://ndownloader.figshare.com/files/5424914 L4 - https://ndownloader.figshare.com/files/5424917 KW - Quaternary deposits KW - fault movements KW - 80 km KW - Previous researchers KW - 1000 years KW - palaeoseismic trenches KW - 4 ka KW - region c KW - fault length KW - Egiin Davaa rupture KW - Egiin Davaa KW - Egiin Davaa earthquake rupture KW - Hangay Mountains KW - scarp height KW - deforming intraplate KW - infilled fissures KW - earthquake ruptures KW - geomorphological preservation KW - 250 m KW - Geomorphological reconstructions KW - 500 years KW - 8 m KW - Geology N2 - 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 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. ER -