Rate of Slip From Multiple Quaternary Dating Methods and Paleoseismic Investigations Along the Talas‐Fergana Fault: Tectonic Implications for the Tien Shan Range

Rizza, Magali; Abdrakhmatov, Kanatbek; Walker, Richard; Braucher, Régis; Guillou, Valéry; Carr, Andrew S.; Campbell, G.; McKenzie, D.; Jackson, James; Aumaître, Georges; Bourlès, Didier; Keddadouche, Karim

doi:10.1029/2018tc005188

Cited by 29 publications

(22 citation statements)

References 119 publications

(259 reference statements)

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“…14b). The slip rate of TFF with 2.2-6.3 mm/year (Rizza et al 2019) consistent with the differences of the shortening rate between the Pamir front and the Kashi-Atushi region. However, these differences may be accommodated on structures within the interior of the Tianshan, where shortening rates have not yet been determined for many faults.…”

Section: Geological Structure and Shortening Of The Kalpin Thrust Strsupporting

confidence: 76%

Segmentation of the Kepingtage thrust fault based on paleoearthquake ruptures, southwestern Tianshan, China

Ran

Gomez

et al. 2020

Nat Hazards

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Decreasing deformation rates across the southern Tianshan have led to different seismogenic mechanisms and different proposed models to explain the orogen-scale fault kinematics. In this study, we focus on the segmentation of the Kepingtage fault by studying variations in the total offset and shortening rates of the Kepingtage fault along the southern front of the Tianshan. We used fault scarp mapping and trench excavations to assess fault segmentation and deformation on the Kepingtage fault. Our results indicate there are different shortening rates on the western (2.5-2.7 mm/year) versus the eastern segments (~ 0.3 mm/year), which are separated by the Piqiang tear fault. The decrease in shortening rates is not gradual; instead, it decreases sharply from west to east at the Piqiang fault. These segmentation boundaries are also supported by geodetic data and balanced structural restorations. Our data support a model where strike-slip faults accommodate step-changes in the deformation rates and the earthquake risks from west to east across the Tianshan.

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Section: Geological Structure and Shortening Of The Kalpin Thrust Strsupporting

confidence: 76%

Segmentation of the Kepingtage thrust fault based on paleoearthquake ruptures, southwestern Tianshan, China

Ran

Gomez

et al. 2020

Nat Hazards

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“…Strike‐slip faulting plays an important role in absorbing and accommodating deformation in the continental convergent orogenic zone (Sutton & Watson, 1974). A deformation pattern of counterclockwise rotations of rectangular blocks around vertical axes driven by the dextral slip faults, such as the Dzhungarian fault and Talas‐Fergana fault (Campbell et al, 2013; Grützner et al, 2019; Molnar & Tapponnier, 1975; Rizza et al, 2019; Tapponnier & Molnar, 1979), accommodates the N‐S convergence related to the India‐Eurasia collision. However, the Dzhungarian Alatau block and Ili block bounded by the DAF and KSHF with different strikes show a triangular shape that is narrow in the east and wide in the west (Figures 11a and 11b).…”

Section: Discussionmentioning

confidence: 99%

“…In addition, the dextral slip rate along the northern margin is greater than the sinistral slip rate along the southern margin of the basin, which means that the rigid Ili block also rotates counterclockwise around a vertical axis (Grützner et al, 2019). The KSHF clearly has a role in 10.1029/2020TC006061 Tectonics accommodating the regional deformation and is similar to the Dzhungarian fault and Talas-Fergana fault (Campbell et al, 2013;Rizza et al, 2019).…”

Section: Faulting Pattern and Deformation Features Around The Ili Basinmentioning

confidence: 97%

“…Therefore, the present deformation of the Tian Shan is mainly localized along the microcontinental boundary (Thompson et al, 2002). The Cenozoic deformation pattern of the Tian Shan has been interpreted as thrust faulting (Abdrakhmatov et al, 1996; Allen et al, 1999; Avouac et al, 1993; Deng et al, 2000; Molnar & Ghose, 2000; Yang et al, 2008; Yin et al, 1998; Zhang et al, 1996, 2003; Zubovich et al, 2010), strike‐slip faulting (Molnar & Tapponnier, 1975; Tapponnier & Molnar, 1979), and block rotation (Avouac et al, 1993; Avouac & Tapponnier, 1993; Rizza et al, 2019).…”

Section: Regional Active Tectonic Settingmentioning

confidence: 99%

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Oblique Right‐Lateral Faulting Along the Northern Margin of the Ili Basin in the Northern Tian Shan, Northwest China

Ren

et al. 2020

Tectonics

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The quantification of the geometry and kinematics of the boundary faults of an active orogenic belt is key to exploring its deformation pattern. The Kashihe fault (KSHF), which bounds the northern margin of the Ili Basin and is more than 400 km long, is a WNW-striking fault in the northern Tian Shan. Although the KSHF displays active faulting and is the seismogenic fault of the 1812 Ms 8 Nilka earthquake, the quantitative slip rate and its role in regional strain accommodation have not been reported. Here, we quantify the late Quaternary activity of the KSHF based on high-resolution remote sensing image interpretations and detailed field investigations. Six field observation sites along a~270 km active fault in the Chinese Tian Shan indicate that the KSHF is characterized by dextral strike-slip faulting and N-S thrusting. Based on the surveying of offset geomorphic surfaces with an unmanned drone and the dating of late Quaternary sediments using optically stimulated luminescence (OSL) and radiocarbon methods, we estimated a late Quaternary right-lateral strike-slip rate across the fault of 2.39 ± 0.55 mm/yr and a shortening rate of 0.62 ± 0.30 mm/yr. Analysis of field investigations and fault section exposing indicated that a young paleoearthquake event occurred on the western segment of the KSHF. Active tectonics around the Ili Basin imply that the rigid Ili block extrudes westward along its boundary strike-slip faults and rotates counterclockwise. We propose that this block rotation driven by dextral faulting accommodates regional N-S convergence and sinistral shearing.

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“…The exposure ages determined for these high 35 Cl samples might be overestimated and should be regarded with caution (e.g., Moulin et al, 2016;Rizza et al, 2019). To help improve the interpretation, probability density plots were derived using DensityPlotter, a java application originally designed to interpret populations of single grains from fission track or luminescence dating (Vermeesch, 2012).…”

Section: Temporal Constraints On Geomorphic Evolution At the Site Scalementioning

confidence: 99%

Seismo‐Tectonic Model for the Southern Pre‐Rif Border (Northern Morocco): Insights From Morphochronology

et al. 2021

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In intraplate tectonic regions characterized by moderate seismic activity, the recognition of active zones of deformation has long been a challenging task (e.g., Landgraf et al., 2017). Like Northern Africa, such regions are generally characterized by low hazard but high risk due to the concentrations highly vulnerable population and/or infrastructures (Moreno et al., 2004). Moreover, when low strain rates are combined with meteorological and anthropogenic overprints, the geomorphic signatures associated with active faults fade away as fault slip rates decrease. Consequently, diagnostic criteria established in areas of high strain rates may not be effectively applied. Furthermore, low-levels of seismic strain induce low displacement rates, which may be distributed over numerous fault segments rather than localized on a single fault. At the regional scale, such a distribution of the tectonic deformation can also obscure the seismogenic potential of any given single structure, as, for example, the La Rouvière Fault reactivation during the 2019 M w 4.9 Le Teil Earthquake (Ritz et al., 2020), in southeastern France, which was previously considered as inactive (Jomard et al., 2017).Part of the peri-Mediterranean Alpine chain surrounding the Alboran Sea, the Rif Mountain belt in Morocco is an area of moderate tectonic activity. Located within the diffuse convergence zone between the Nubia Abstract Located at the southern boundary of the Alpine chain in Morocco, the deformation front of the Southern Rif Mountains is a region of moderate tectonic activity, which makes it a good natural laboratory to understand whether, and how, low compressional strains are located on specific structures. Along the ≈80 km-long left-lateral, transpressive and reverse fault zone that runs at the toe of the Pre-Rif Ridges, an analysis of high-resolution digital topography provides new geomorphic lines of evidence supporting Quaternary activity along, 20 km-long fault segments. The fault zone can be divided into the Meknès and the Fès segments, which are constrained at depth by reactivated, NE-trending basement faults, delimitating paleo-grabens associated with the Late Triassic-Jurassic opening of the Atlantic Ocean. For selected sites, we used in situ-produced 36 Cl, 10 Be, and 26 Al and high-resolution topography to infer the timing of abandonment of fluvial markers, which suggest incision rates on the order of 0.6-2 mm/yr. Given their lengths, scaling laws suggest that the identified fault segments should root at about 7-12 kmdepth, possibly reactivating former basement normal faults and making them potential seismogenic sources capable of generating M w 6+ earthquakes, with return times of the order of several hundreds of years. Our new morphochronological data set confirms that the Southern Rif deformation front is a key structure that may have accommodated most of the lateral extrusion of the Rif between the Nubia and Iberia tectonic plates.Plain Language Summary In Morocco, the population may suffer from the dramatic consequences of ...

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Rate of Slip From Multiple Quaternary Dating Methods and Paleoseismic Investigations Along the Talas‐Fergana Fault: Tectonic Implications for the Tien Shan Range

Cited by 29 publications

References 119 publications

Segmentation of the Kepingtage thrust fault based on paleoearthquake ruptures, southwestern Tianshan, China

Segmentation of the Kepingtage thrust fault based on paleoearthquake ruptures, southwestern Tianshan, China

Oblique Right‐Lateral Faulting Along the Northern Margin of the Ili Basin in the Northern Tian Shan, Northwest China

Seismo‐Tectonic Model for the Southern Pre‐Rif Border (Northern Morocco): Insights From Morphochronology

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