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Andrey M. Korjenkov J. Ramon Arrowsmith Christopher Crosby Ernes Mamyrov Lyubov A. Orlova Irina E. Povolotskaya Kubatbek Tabaldiev 《Journal of Seismology》2006,10(4):431-442
A paleoseismological study of the medieval Kamenka fortress in the northern part of the Issyk-Kul Lake depression, northern Tien Shan in Kyrgyzstan, revealed an oblique slip thrust fault scarp offsetting the fortification walls. This 700 m long scarp is not related to the 1911 Kebin Earthquake (Ms 8.2) fault scarps which are widespread in the region. As analysis of stratigraphy in a paleoseismic trench and archaeological evidence reveal, it can be assigned to a major twelfth century a.d. earthquake which produced up to 4 m of oblique slip thrusting antithetic to that of the nearby dominant faults. The inferred surface rupturing earthquake apparently caused the fortress destruction and was likely the primary reason for its abandonment, not the Mongolian–Tatar invasions as previously thought. 相似文献
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Paleoseismological study along the Talas-Fergana Fault near the Kök-Bel Pass in the central Western Tien Shan allows us to estimate the rate of late Holocene horizontal offset at 13–14 mm/yr, as well as the radiocarbon age of the strong earthquakes that occurred here about 300, 2400, and 5000 yr ago. 相似文献
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A.M. Korjenkov S.V. Abdieva A.B. Dzhumabaeva A.B. Fortuna E. Mamyrov E.A. Morozova L.A. Orlova P.S. Vakhrameeva 《Russian Geology and Geophysics》2011,52(9):1007-1015
The northern Tien Shan is the northern front of the Himalayan mountain belt, which resulted from the collision between the Indian and Eurasian Plates. This region encompasses the most active seismic zones of the orogen, which generated the strongest (M > 8) earthquakes. Since there are scarcely any written accounts, the only way to trace back strong earthquakes is the paleoseismologic method. Since 1984 we have been studying the northwestern Issyk Kul’ basin, where there are differently directed anticlines, which constitute the Kungei meganticline. Here, several active tectonic structures (faults, folds) are located, whose development was accompanied by strong earthquakes. Our field studies of 2008 in the Iiri-Taldybulak Valley, along the adyrs (foothills) of the Kungei-Ala-Too Range, revealed two unknown historical earthquakes. The first one, which occurred along the southern rupture in the late 7th century A.D., gave rise to a seismic scarp; the latter broke through the river floodplain and a tash-koro (ancient settlement). The second one, which occurred along the northern rupture in the late 9th century A.D., increased the height of the seismic scarp, existing on the Early Holocene and older terraces. Note that this region already records a strong seismic event around 500 A.D. Archeologic data have revealed one more strong earthquake, which took place in the 14th century A.D. Note that the above-mentioned strong seismic events are coeval with the decline of the nomadic cultures (Wusun, Turkic, Mogul) in the northern Tien Shan and Zhetysu (Semirech’e). 相似文献
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V. I. Utkin E. Mamyrov M. V. Kan S. V. Krivasheev A. K. Yurkov I. I. Kosyakin A. N. Shishkanov 《Izvestiya Physics of the Solid Earth》2006,42(9):775-784
Preliminary results of space-time radon monitoring in the Northern Tien Shan are presented. The study area was chosen on the basis of the known seismic events. A basic model of the observed effects is determined. The radon exhalation is shown to depend nonlinearly on variations in the stress state of the medium and the recording mode of the radon field. A geodynamic model of earthquake nucleation is presented and the expected effects in the radon field are examined. Results of measuring radon field variations before earthquakes are presented. It is shown that noticeable and characteristic changes in the radon field are observed, respectively, 90–100 and 3–5 days before a seismic event. Constraints are gained on the response of the radon field within a sedimentary rock mass to the passage of waves generated by distant earthquakes. The data presented in the paper show that radon monitoring can be successfully used for studying the process of earthquake nucleation. The model of tectonic earthquake nucleation proposed in the paper uses data of multidisciplinary geophysical monitoring (including radon monitoring) to obtain a deterministic indicator of earthquake nucleation. 相似文献
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A.M. Korjenkov K.Sh. Tabaldiev Al.V. Bobrovskii Ar.V. Bobrovskii E.M. Mamyrov L.A. Orlova 《Russian Geology and Geophysics》2009,50(1):63-69
We report a macroseismic study of a ruined medieval building, a small caravanserai located along the caravan way from the Talas valley to the Chatkal and Fergana valleys in Kyrgyzstan. The ruins document several events in which the caravanserai was destroyed, apparently during earthquakes, and was rebuilt or repaired. The earliest earthquake occurred soon after the building was put up, about 400 years ago, according to radiocarbon dating of charcoal, and another event shook the area between 400 and 50 years BP. After being damaged in the ultimate earthquake, in the middle of the 20th century, the building was eventually abandoned. 相似文献
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The Tien Shan is one of the most active intracontinental mountain belts exhibiting numerous examples of Quaternary fault-related folding. To provide insight into the deformation of the Quaternary intermontane basins, the territory of the northwestern Ysyk-Köl region, where the growing Ak-Teke Anticline divided the piedmont apron of alluvial fans, is studied. It is shown that the Ak-Teke Hills are a sharply asymmetric anticline, which formed as a result of tectonic uplift and erosion related to motions along the South Ak-Teke Thrust Fault. The tectonic uplift gave rise to the local deviation of the drainage network in front of the northern limb of the fold. Optical (luminescent) dating suggests that the tectonic uplifting of the young anticline and the antecedent downcutting started 157 ka ago. The last upthrow of the high floodplain of the Toru-Aygyr River took place 1300 years ago. The structure of the South Ak-Teke Fault is examined by means of seismologic trenching and shallow seismic profiling across the fault. A laser tachymeter is applied to determine the vertical deformation of alluvial terraces in the Toru-Aygyr River valley at its intersection with the South Ak-Teke Fault. The rates of vertical deformation and an inferred number of strong earthquakes, which resulted in the upthrow of Quaternary river terraces of different ages, are calculated. The study territory is an example of changes in fluvial systems on growing folds in piedmont regions. As a result of shortening of the Earth’s crust in the mountainous belt owing to thrusting, new territories of previous sedimentation are involved in emergence. The tectonic activity migrates with time from the framing ridges toward the axial parts of intramontane basins. 相似文献
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