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Kinematic Characteristics and Timing of Dead Lakes Rock Avalanche in Kyrgyzstan

  • Journal of the Association of Korean Geographers
  • Abbr : JAKG
  • 2018, 7(2), pp.141-156
  • DOI : 10.25202/JAKG.7.2.2
  • Publisher : Association of Korean Geographers
  • Research Area : Social Science > Geography
  • Received : July 29, 2018
  • Accepted : August 10, 2018

Oh, Jeong-Sik 1 SEONG, Yeong Bae 1 Alexander Strom 2 Byung-Yong Yu 3

1고려대학교 지리교육과
2러시아 지구역학연구센터 수문연구부(Geodynamic Research Center, Branch of JSC, Hydroproject, Moscow, Russia)
3한국과학기술연구원 특성분석센터

Accredited

ABSTRACT

Rock avalanches are one of the fastest type of landslides and because of their magnitude and energy, can cause huge damage over large areas. The purpose of this study is to demonstrate the characteristics of morphology and kinematics of Dead Lakes rock avalanche, Kyrgyzstan and to provide the timing of its occurrence constrained by cosmogenic 10Be surface exposure dating. The Dead Lakes rock avalanche initiated with the collapse of the entire mountain slope up to its top, composed of bedrock, and moved for ca. 7.5 km with elevation decrease up to ~1750 m if measured from the headscarp crown to the deposit’s tip. Its source zone is up to 2.7 km by 2.5 km in plan view. The deposits thickness is about 150 m on the average and its volume is ~2.2km3 over the area of 14.65 km2. Four different motion patterns evolved during high-energetic motion process can be revealed from the landslide-related landforms such as toreva block, debris ridges, levees, linear structures, terraces, and hummocks. The timing of occurrence of the Dead Lakes rock avalanche revealed by 10Be exposure dating was 48.3±2.4 ka, which was likely to be triggered by huge earthquake.

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