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Abstract <p>The orographic framework of the Okhotsk-Kolyma region includes three tectonically distinguished types of structures: fold belts, volcanic-tectonic belts, and rifts. Large fault zones striking in the NW, NE, and W‒E directions bound neotectonic blocks of different geometries, with different amounts of vertical offset. A number of large faults in the southeastern flank of the Chersky Range have generated large instrumental and historic earthquakes. Past earthquakes left traces evident in the present surface as ruptures, slope failure and mass wasting features, dammed river valleys, colluvial fans and flows. The gravity and tectonic features induced by paleoearthquakes are often associated with debris slides, debris flows, and drained surfaces of lakes dammed by landslides.</p>

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Active Faults, Seismicity, and Traces of Past Large Earthquakes in the Okhotsk-Kolyma Region

  • 期刊论文

  • 发表日期：

    2025年6月26日

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  • V. N. Smirnov,
  • O. Yu. Glushkova

摘要

Abstract

The orographic framework of the Okhotsk-Kolyma region includes three tectonically distinguished types of structures: fold belts, volcanic-tectonic belts, and rifts. Large fault zones striking in the NW, NE, and W‒E directions bound neotectonic blocks of different geometries, with different amounts of vertical offset. A number of large faults in the southeastern flank of the Chersky Range have generated large instrumental and historic earthquakes. Past earthquakes left traces evident in the present surface as ruptures, slope failure and mass wasting features, dammed river valleys, colluvial fans and flows. The gravity and tectonic features induced by paleoearthquakes are often associated with debris slides, debris flows, and drained surfaces of lakes dammed by landslides.