Abstract
The paper presents results of seismogeological studies of active faults bordering the Upper Kerulen basin, one of the largest intermountain basins of the Khentei upland. Morphometric and trenching methods were applied to estimate the main parameters of seismogenic dislocations and associated Holocene palaeoearthquakes (540–2810, 3170–3720, and 7480–9220 years ago). The maximum palaeoearthquake magnitude (7.5) characterizes the seismic capacity of the potential focal area (PFA) confined to the Kerulen fault. The new data show the need to revise the potential seismicity concepts of the southern Khentey area and to make appropriate changes in the general seismic zoning maps. The relationship between the dislocations and the modern topography features, as well as deformation of the subsurface sediments in the studied mine openings give evidence of thrusting under the sub-lateral to north-western subhorizontal compression.
Highlights
Аннотация: Представлены результаты сейсмогеологических исследований активных разломов, ограничивающих Верхнекеруленскую впадину – одну из крупнейших межгорных впадин Хэнтейского нагорья
trenching methods were applied to estimate the main parameters of seismogenic dislocations
shearing planes mentioned in the text
Summary
Долгие десятилетия Хэнтейское нагорье было обделено вниманием сейсмогеологов, хотя активные разломы были выделены здесь еще в конце 1950-х годов [Aprodov, 1960]. Необходимость проведения детальных сейсмогеологических исследований на территории Хэнтея была осознана после 2005 г., когда в южной части Хэнтея (в районах, прилегающих к Улан-Батору) в результате сейсмологических наблюдений (с регистрацией землетрясений, в том числе и в низшем энергетическом уровне с М
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