Abstract

We have studied the eastern end of the Kultor adyr (foothill) fault in northern Lake Issyk-Kul region. Morphologically, the fault zone is a staircase of seismic fault scarps formed by movements along few adjacent ruptures gently tilted under the adyrs (northward). Numerous Saka-Wusun, Turkic and Karakhanid archeological monuments ended up to the slope parts of the fault scarps and were damaged or destroyed. Logging of paleoseismological trenches excavated across southernmost and youngest fault scarps has made it possible to determine the minimum age, recurrence period, and energy of strong historical earthquakes. Strong earthquakes along the studied part of the adyr fault occurred during the following periods: 60–170 AD; 530–620 AD; 1160–1250 AD; 1410–1460 AD. The time intervals among dates (strong earthquake reccurrence along the fault) is 200–600 years. The obtained parameters of the fault scarps were used to calculate the magnitudes of historical seismic events: M = 7.2 and M = 6.9 according to the heights of the studied fault scarps. These magnitudes can produce seismic oscillations in the Earth’s surface with I₀ ≥ IX according to the MSK-64 Scale. We have confirmed our earlier supposition that the southern parts of the Issyk-Kul Depression were involved in uplift. A lateral longitudinal increase in the area of the adyrs occurs during strong earthquakes. These conclusions are important for a new seismic hazard assessment of the northern Lake Issyk-Kul region, the most populated part of Issyk-Kul Oblast, Kyrgyz Republic, as well as for other regions of the earth evolving in a postplatform orogenic regime.

中文翻译：

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艾迪尔断层：伊塞克湖洼地强烈地震的产生者（以库尔托断层带为例）

摘要

我们研究了北部伊塞克湖地区的库尔托尔阿迪尔（山麓）断裂的东端。从形态上讲，断层带是地震断层阶梯的阶梯，是由沿相邻胎体（向北）缓缓倾斜的几个相邻断裂运动形成的。许多Saka-Wusun，Turkic和Karakhanid考古遗迹一直延伸到断层陡坡的斜坡部分，并被损坏或破坏。在最南端和最年轻的断层陡坡上开挖的古地震trench沟的测井，可以确定发生强烈历史地震的最小年龄，复发周期和能量。在以下时期，沿adyr断层的研究部分发生了强烈地震：公元60-170年。530-620 AD; 公元1160年至1250年；公元1410年至1460年。日期之间的时间间隔（沿断层发生强烈地震）为200-600年。所获得的断层陡坡参数用于计算历史地震事件的幅度：根据所研究断层陡峭带的高度，M = 7.2和M = 6.9。这些量值可以产生在地球表面的地震振动与我₀根据MSK-64标度≥IX。我们已经证实了我们先前的假设，即伊塞克湖凹陷的南部地区参与了隆升。在强烈地震期间，横纹的面积横向增加。这些结论对于吉尔吉斯共和国伊塞克湖州北部人口最多的伊塞克湖北部地区的新地震危害评估以及地球上其他在后平台造山运动中演化的地区而言都是重要的。