Seismotectonic study of the Fergana Region (Southern Kyrgyzstan): distribution and kinematics of local seismicity

Feld, Christian; Haberland, Christian; Schurr, Bernd; Sippl, Christian; Wetzel, Hans‐Ulrich; Roessner, Sigrid; Ickrath, Michèle; Abdybachaev, U.; Orunbaev, S.

doi:10.1186/s40623-015-0195-1

Cited by 18 publications

(15 citation statements)

References 37 publications

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“…The Alai Range of the Tien Shan Mountains is part of a region with ongoing tectonic activity, with evidence of multiple earthquake ruptures in the past (Taylor and Yin, ; Landgraf et al ., ), although not all range fronts and intra‐mountain basins exhibit a widely distributed high level of current seismicity (Haberland et al ., ; Feld et al ., ). In general, earthquake focal mechanisms are compatible with the kinematics of the regionally characteristic reverse fault, thrust fault and displacements along strike–slip faults.…”

Section: Geologic and Geomorphologic Setting Of The Southern Tien Shamentioning

confidence: 99%

Deep‐seated gravitational slope deformation (DSGSD) and slow‐moving landslides in the southern Tien Shan Mountains: new insights from InSAR, tectonic and geomorphic analysis

Teshebaeva

Echtler

Bookhagen

et al. 2019

Earth Surf Processes Landf

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We investigated deep‐seated gravitational slope deformation (DSGSD) and slow mass movements in the southern Tien Shan Mountains front using synthetic aperture radar (SAR) time‐series data obtained by the ALOS/PALSAR satellite. DSGSD evolves with a variety of geomorphological changes (e.g. valley erosion, incision of slope drainage networks) over time that affect earth surfaces and, therefore, often remain unexplored. We analysed 118 interferograms generated from 20 SAR images that covered about 900 km2. To understand the spatial pattern of the slope movements and to identify triggering parameters, we correlated surface dynamics with the tectono‐geomorphic processes and lithologic conditions of the active front of the Alai Range. We observed spatially continuous, constant hillslope movements with a downslope speed of approximately 71 mm year−1 velocity. Our findings suggest that the lithological and structural framework defined by protracted deformation was the main controlling factor for sustained relief and, consequently, downslope mass movements. The analysed structures revealed integration of a geological/structural setting with the superposition of Cretaceous–Paleogene alternating carbonatic and clastic sedimentary structures as the substratum for younger, less consolidated sediments. This type of structural setting causes the development of large‐scale, gravity‐driven DSGSD and slow mass movement. Surface deformations with clear scarps and multiple crest lines triggered planes for large‐scale deep mass creeps, and these were related directly to active faults and folds in the geologic structures. Our study offers a new combination of InSAR techniques and structural field observations, along with morphometric and seismologic correlations, to identify and quantify slope instability phenomena along a tectonically active mountain front. These results contribute to an improved natural risk assessment in these structures. © 2019 The Authors. Earth Surface Processes and Landforms Published by John Wiley & Sons Ltd

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Section: Geologic and Geomorphologic Setting Of The Southern Tien Shamentioning

confidence: 99%

Deep‐seated gravitational slope deformation (DSGSD) and slow‐moving landslides in the southern Tien Shan Mountains: new insights from InSAR, tectonic and geomorphic analysis

Teshebaeva

Echtler

Bookhagen

et al. 2019

Earth Surf Processes Landf

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“…More recently a seismotectonic study conducted in the Fergana basin and surrounding areas presents evidence for a cluster of events in 2009. Fault plane solutions showed a clear strike‐slip mechanism (strike = 20°, dip = 80°, rake = −10°), which is in good agreement with the general strike of the TFF (Feld et al, ).…”

Section: Seismicity Kinematics and Fault Segmentation Of The Tffmentioning

confidence: 99%

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

et al. 2019

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The ~400‐km‐long Talas‐Fergana Fault is one of a series of major right‐lateral strike‐slip faults that cross the Tien Shan Range. This fault has been recognized as active in the late Holocene and accommodates part of the deformation induced by the ongoing Indo‐Asian collision. The kinematics and the role of this strike‐slip fault are poorly understood with no large earthquakes reported in the instrumental or historical catalogs, and no well‐constrained geological slip‐rate estimates. Here we used high‐resolution satellite imagery to present a first detailed analysis of the fault segmentation. We identified nine geometric segments based on strike variations for the Talas‐Fergana Fault. Along the Kyldau segment, through morphological analyses of an offset alluvial fan and the application of multiple dating methods (10Be, 26Al, 36Cl, luminescence, and radiocarbon), we calculated a late Quaternary slip rate ranging from 2.2 to 6.3 mm/year. This rate is higher than the geodetic measurements, but the discrepancy can be partly explained if the Talas‐Fergana Fault accommodates shortening by counterclockwise rotation around a vertical axis. Paleoearthquakes identified by trenching indicate that at least two primary surface ruptures (and possibly a third) occurred in the past 3,800 years, and that no large earthquake has ruptured the Kyldau segment since at least 420 years B.P. (possibly within the last 2,700 years), making this fault segment a potential candidate to generate an earthquake with M > 7 in the near future.

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“…Stratigraphic relations also show that the Pamir propagated northward during the middle Miocene‐Pliocene [ Burtman and Molnar , ; Coutand et al ., ]. Geodetic and seismic data show that this shortening is quite active [ Zubovich et al ., ; Schurr et al ., ; Feld et al ., ]. Teshebaeva et al .…”

Section: Interpretation Of Agesmentioning

confidence: 99%

Exhumation history of the western Kyrgyz Tien Shan: Implications for intramontane basin formation

et al. 2017

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The dextral Talas‐Fergana Fault separates the western from the central Tien Shan. Recent work has shed light on the Cenozoic evolution of the eastern and central Tien Shan; much less attention has been paid to the western Tien Shan. In this contribution we present new thermochronological ages for the Fergana and Alai ranges that, combined with the available data set, constrain the Cenozoic exhumation history of the western Tien Shan. Following a tectonically quiet early Cenozoic period, we suggest an onset of exhumation at ~25 Ma. This early onset was followed by a period of slower exhumation and in some areas minor reheating. A final, strong late Miocene rapid cooling event is well represented in the western Tien Shan as in other sectors of the range. The early onset of uplift of the western Tien Shan dissected the previously continuous westernmost Parathethyan Sea, progressively isolating basins (e.g., Fergana, Tarim, and Alai basins) in the central Asian hinterland. Moreover, the coeval timing of late Miocene uplift along the length of entire Tien Shan implies that neither the Pamir nor Tarim can be the sole driver for exhumation of the entire range.

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Seismotectonic study of the Fergana Region (Southern Kyrgyzstan): distribution and kinematics of local seismicity

Cited by 18 publications

References 37 publications

Deep‐seated gravitational slope deformation (DSGSD) and slow‐moving landslides in the southern Tien Shan Mountains: new insights from InSAR, tectonic and geomorphic analysis

Deep‐seated gravitational slope deformation (DSGSD) and slow‐moving landslides in the southern Tien Shan Mountains: new insights from InSAR, tectonic and geomorphic analysis

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

Exhumation history of the western Kyrgyz Tien Shan: Implications for intramontane basin formation

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