New space geodetic constraints on the distribution of deformation in Central Asia

Reigber, Ch.; Michel, G; Galas, R.; Angermann, D; Klotz, J.; Chen, J.Y.; Papschev, A.; Arslanov, R.; Tzurkov, V. E.; Ishanov, M. C.

doi:10.1016/s0012-821x(01)00414-9

Cited by 206 publications

(197 citation statements)

References 30 publications

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“…This estimate agrees with the 8 ± 3 mm/yr shortening inferred from GPS measurements over a 6-year period across the Aksu-Kashi fold-and-thrust belt [Reigber et al, 2001].…”

Section: Total Shortening Ratesupporting

confidence: 87%

Irregular earthquake cycle along the southern Tianshan front, Aksu area, China

et al. 2005

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[1] A long deformation record ($16.5 ka) showing nonsteady earthquake recurrence is established for the Aksu thrust (Tianshan, China) on the basis of cosmogenic 10 Be dating of faulted surfaces. Topographic leveling across the Aksu fault scarp indicates up to $10 m uplift across a moraine abandoned $16.5 ka and similar uplift of $6 m across two inset surfaces yielding ages of $12.5 and $5 ka. Successively smaller uplifts of terraces younger than 5 ka indicate that three or more major earthquakes occurred during this period. These data show that the Aksu thrust fault was quiet for at least 7500 years and active in the last $5000 years and probably in the interval 16.5-12.5 ka. The seismic cycle along the Aksu thrust fault over the last $16,500 years was thus strongly irregular showing long quiescence and clustering, which is a challenge for paleoseismology and hazard assessment. This irregularity also makes it more difficult to estimate long-term shortening rates. Nevertheless, we are able to constrain a minimum total shortening rate (>7 mm/yr) across the southern Tianshan front for the last 12,500 years that is about a third of the total geodetic rate for the western Tianshan ($20 mm/yr).

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“…This estimate agrees with the 8 ± 3 mm/yr shortening inferred from GPS measurements over a 6-year period across the Aksu-Kashi fold-and-thrust belt [Reigber et al, 2001].…”

Section: Total Shortening Ratesupporting

confidence: 87%

Irregular earthquake cycle along the southern Tianshan front, Aksu area, China

et al. 2005

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“…This later owes its origin to the Cenozoic reactivation of the range during the Oligocene to early Miocene (>16 Ma) (Avouac et al, 1993;Bullen et al, 2003;Bullen et al, 2001;Charreau et al, 2009a;Charreau et al, 2005;Charreau et al, 2006;Dumitru et al, 2001;Sobel et al, 2006;Sobel and Dumitru, 1997;Windley et al, 1990;Yin et al, 1998), under the influence of the ongoing India-Asia collision. The Tianshan range indeed plays a major role in the IndiaAsia collision since it presently accomodates up to 40% of the total convergence between those two continents (Abdrakhmatov et al, 1996;Reigber et al, 2001). It is sandwiched between two large intracontinental basins ( Fig.…”

Section: -Geological Settings and Samplingmentioning

confidence: 99%

Paleo-erosion rates in Central Asia since 9Ma: A transient increase at the onset of Quaternary glaciations?

Charreau

Blard

Puchol

et al. 2011

Earth and Planetary Science Letters

101

141

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“…Situated at the western end of the India-Asia collision zone, the Pamir have experienced some of the highest deformation rates on the planet (e.g., Burtman and Molnar, 1993;Pegler and Das, 1998;Reigber et al, 2001;Ducea et al, 2003;Wheeler et al, 2005). The topography of the Pamir is dominated by a series of Oligo-Miocene domes (Hubbard et al, 1999;Ducea et al, 2003;Schwab et al, 2004;Amidon and Hynek, 2010).…”

Section: Introductionmentioning

confidence: 99%

Rates of river incision across the main tectonic units of the Pamir identified using optically stimulated luminescence dating of fluvial terraces

et al. 2014

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Calculated incision rates along the Panj, the main river of the Pamir, are used to investigate any influence by tectonics or climate on the architecture of the river. The depositional ages of Panj river terraces were calculated using optically stimulated luminescence (OSL) dating of terrace sand. Fluvial incision rates were generated by integrating the terrace depositional ages with accurate kinematic GPS measurements of terrace heights above the modern Panj. We investigated 16 terraces along the Panj at the western Pamir margin and one terrace from the Vakhsh River to the north of the Pamir. The results reveal brief periods of fluvial deposition over the past 26 kyr. The oldest Panj terrace depositional ages coincide with early MIS 2 and MIS 2/1 glaciations on the Pamir Plateau. Younger terrace ages have no apparent link with glacial cycles. Terraces with varying heights above the modern Panj at different localities yielded similar depositional ages. This suggests that local conditions have determined fluvial incision rates. Combining all of the terrace measurements, the average incision rate of the Panj over the last 26 kyr has been ∼5.6 mm/yr. A high mean incision rate of ∼7.3 mm/yr was calculated from terraces where the Panj has cut a steep-sided valley through the Shakhdara Dome. Significantly lower incision rates (∼2 -3 mm/yr) were calculated from terraces where the Panj flows along the southern boundaries of the Shakhdara and Yazgulom domes. At those localities, graded segments of the Panj river profile and increased valley widths are indicative of local base levels. Downstream of the Yazgulom Dome, river incision rates are generally lower (∼4 -5 mm/yr) than the Panj average. However, there is one exception where higher incision rates (∼6 mm/yr) were calculated upstream of the Darvaz Fault Zone, a major tectonic feature that forms the western boundary of the Pamir. The Vakhsh river terrace to the north of the Pamir yielded a lower incision rate (∼3 mm/yr) compared to the Panj average. Variation in incision rates along the Panj does not correspond to changes in rock type or river catchment area. Instead, incision rates appear to have been primarily influenced by river capture across the southern and central metamorphic domes of the Pamir. Wherever the Panj cuts these domes it displays a convex river profile. The combination of localized river profile convexity and changes in incision rates across the Pamir domes indicates that the dome boundaries have been active recently.

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New space geodetic constraints on the distribution of deformation in Central Asia

Cited by 206 publications

References 30 publications

Irregular earthquake cycle along the southern Tianshan front, Aksu area, China

Irregular earthquake cycle along the southern Tianshan front, Aksu area, China

Paleo-erosion rates in Central Asia since 9Ma: A transient increase at the onset of Quaternary glaciations?

Rates of river incision across the main tectonic units of the Pamir identified using optically stimulated luminescence dating of fluvial terraces

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