现代地质2011，Vol.25Issue(5)：938-957,20.
内蒙古包头市区大青山山前断裂地震活动断层初步研究
Preliminary Study on Seismic Active Faults of the Daqingshan Frontal Fault in Baotou City, Inner Mongolia
摘要
Abstract
Through several years of field investigation and dating paleoearthquake events on the Daqingshan frontal fault, it is initially obtained that Baotou is situated in the western segment of Holocene fault of the Daqingshan frontal fault, which expands along the frontal borders of terrace I or II and is expressed by a series of seismic deformation, such as seismic faults, fault scarps, colluvial wedges, fissure-fill wedges, ground fissures , and liquefaction, which make up of extensive and continual surface ruptures. The seismic faults extend linearly or in a wide arc showing as en echelon faults, and penetrate Holocene strata and the youngest geomor-phic surface, and manifest as a series of south dipping normal faults and step normal faults. The fault planes are flat with downward scratches; the fault zone is often filled with sandy gravel, breccia, or sand and soil, indicating that the fault is mainly controlled by extensional tectonic force and experienced five times of dip-sliping movement. The latest event may be the 849 A. D. Baotou earthquake. On the basis of the prelimiary study of Holocene active features, division of activity period and strong-earthquake recurrence interval, in combination with action of the historical and present earthquakes, we should pay more attention to the earthquake hazard of Baotou.关键词
大青山山前断裂/全新世地震活动断层/地震地表破裂带Key words
the Daqingshan frontal fault/ Holocene active fault/ seismological surface rupture trace分类
天文与地球科学引用本文复制引用
聂宗笙,任云,刘志明,杜成龙,丛培历..内蒙古包头市区大青山山前断裂地震活动断层初步研究[J].现代地质,2011,25(5):938-957,20.基金项目
国家自然科学基金项目(40972143). （40972143）
