Repeated large-magnitude earthquakes in a tectonically active, low-strain continental interior: The northern Tien Shan, Kyrgyzstan

A. Landgraf, A. Dzhumabaeva, K. E. Abdrakhmatov, M. R. Strecker, E. A. Macaulay, Ramon Arrowsmith, H. Sudhaus, F. Preusser, G. Rugel, S. Merchel

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

The northern Tien Shan of Kyrgyzstan and Kazakhstan has been affected by a series of major earthquakes in the late 19th and early 20th centuries. To assess the significance of such a pulse of strain release in a continental interior, it is important to analyze and quantify strain release over multiple time scales. We have undertaken paleoseismological investigations at two geomorphically distinct sites (Panfilovkoe and Rot Front) near the Kyrgyz capital Bishkek. Although located near the historic epicenters, both sites were not affected by these earthquakes. Trenching was accompanied by dating stratigraphy and offset surfaces using luminescence, radiocarbon, and 10Be terrestrial cosmogenic nuclide methods. At Rot Front, trenching of a small scarp did not reveal evidence for surface rupture during the last 5000 years. The scarp rather resembles an extensive debris-flow lobe. At Panfilovkoe, we estimate a Late Pleistocene minimum slip rate of 0.2 ± 0.1 mm/a, averaged over at least two, probably three earthquake cycles. Dip-slip reverse motion along segmented, moderately steep faults resulted in hanging wall collapse scarps during different events. The most recent earthquake occurred around 3.6 ± 1.3 kyr ago (1σ), with dip-slip offsets between 1.2 and 1.4 m. We calculate a probabilistic paleomagnitude to be between 6.7 and 7.2, which is in agreement with regional data from the Kyrgyz range. The morphotectonic signals in the northern Tien Shan are a prime example of deformation in a tectonically active intracontinental mountain belt and as such can help understand the longer-term coevolution of topography and seismogenic processes in similar structural settings worldwide.

Original languageEnglish (US)
Pages (from-to)3888-3910
Number of pages23
JournalJournal of Geophysical Research: Solid Earth
Volume121
Issue number5
DOIs
StatePublished - May 1 2016

Fingerprint

Kyrgyzstan
continental interior
earthquake magnitude
Earthquakes
earthquakes
Trenching
earthquake
slip
dip-slip fault
Geochronology
Kazakhstan
escarpments
Stratigraphy
stratigraphy
slip rate
coevolution
hanging wall
nuclides
luminescence
dating

Keywords

  • Central Asia
  • paleoseismology
  • Tien Shan

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geophysics
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science

Cite this

Repeated large-magnitude earthquakes in a tectonically active, low-strain continental interior : The northern Tien Shan, Kyrgyzstan. / Landgraf, A.; Dzhumabaeva, A.; Abdrakhmatov, K. E.; Strecker, M. R.; Macaulay, E. A.; Arrowsmith, Ramon; Sudhaus, H.; Preusser, F.; Rugel, G.; Merchel, S.

In: Journal of Geophysical Research: Solid Earth, Vol. 121, No. 5, 01.05.2016, p. 3888-3910.

Research output: Contribution to journalArticle

Landgraf, A, Dzhumabaeva, A, Abdrakhmatov, KE, Strecker, MR, Macaulay, EA, Arrowsmith, R, Sudhaus, H, Preusser, F, Rugel, G & Merchel, S 2016, 'Repeated large-magnitude earthquakes in a tectonically active, low-strain continental interior: The northern Tien Shan, Kyrgyzstan', Journal of Geophysical Research: Solid Earth, vol. 121, no. 5, pp. 3888-3910. https://doi.org/10.1002/2015JB012714
Landgraf, A. ; Dzhumabaeva, A. ; Abdrakhmatov, K. E. ; Strecker, M. R. ; Macaulay, E. A. ; Arrowsmith, Ramon ; Sudhaus, H. ; Preusser, F. ; Rugel, G. ; Merchel, S. / Repeated large-magnitude earthquakes in a tectonically active, low-strain continental interior : The northern Tien Shan, Kyrgyzstan. In: Journal of Geophysical Research: Solid Earth. 2016 ; Vol. 121, No. 5. pp. 3888-3910.
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