Holocene slip-rate on the Sabzevar thrust fault, NE Iran, determined using optically stimulated luminescence (OSL)

Details Holocene slip-rate on the Sabzevar thrust fault, NE Iran, determined using optically stimulated luminescence (OSL) Holocene slip-rate on the Sabzevar thrust fault, NE Iran, determined using optically stimulated luminescence (OSL)

May 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006e%26psl.245..673f&link_type=abstract

Earth and Planetary Science Letters, Volume 245, Issue 3-4, p. 673-684.

Physics

12

Scientific paper

Fault slip-rates and the recurrence interval between earthquakes can be determined from reliable dating of deformed sediments. We report optically stimulated luminescence (OSL) ages of alluvial gravels, fine-grained sediments and colluvial deposits associated with the Sabzevar thrust fault in northeastern Iran. Six samples of the late Quaternary deposits were dated by OSL using the single aliquot regenerative-dose (SAR) protocol. The OSL ages indicate deposition of alluvial gravels in the study region between ˜ 30 and ˜ 9-13 ka, followed by a period of fluvial incision which is ongoing at the present day. The alluvial deposits have been uplifted by ˜ 9.5 m relative to the river level, indicating a Holocene slip-rate of ˜ 1 mm/yr and a rate of convergence across the fault of 0.4-0.6 mm/yr assuming a maximum fault dip of 60°. The average interval between large earthquakes on the Sabzevar fault will be ˜ 3000 years if the fault dips ˜ 60°, and less if the fault dip is less. The last earthquake to destroy Sabzevar was in 1052 A.D.

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