Based on detailed field investigations, this paper describes the geometrical characteristics and tectonic activities of the Zhangjiakou fault at the northwest of Beijing. This fault strikes mainly northwest to west, s...Based on detailed field investigations, this paper describes the geometrical characteristics and tectonic activities of the Zhangjiakou fault at the northwest of Beijing. This fault strikes mainly northwest to west, short parts of which strike near east to west, dipping north, and extends over a length of 70km. It is a major geological and geomorphologicai margin, controlling the neotectonic movement in this region. On the south side of the Zhangjiakou fault are the Late Quaternary unconsolidated deposits, forming basins; while on the other side are Mesozoic volcano debris and Pre-Mesozoic metamorphic rocks, forming lower mountains and hills. The Zhangjiakou fault consists mainly of high-angle inverse strike-slip fault and partially of normal strike-slip fault. Among these, the north-dipping NW-NWW-trending secondary faults, constituting the main fracture of the fault, have inverse characteristics; those near the EW-trending secondary faults are links of the former faults, with a smaller length and normal faulting characteristics. Thus, the Zhangjiakou fault is a north-dipping inverse and partially south-dipping normal strike-slip fault. The Zhangjiakou fault has been continuously active since the Quaternary. With the exception of the western end extension, which has been active since the late Pleistocene, the main part of the fault has been active since the Holocene. The central main segment of the Zhangjiakou fault is more active. Since the mid-late period of the late Pleistocene, the average vertical slip rate of a single fault has been over 0. 07mm/a - 0. 30mm/a. The Zhangjiakou fault has multi-slip surfaces, and the total vertical slip rate reaches 1.33mm/a, estimated from the Qingshuihe river terraces and the relevant drilling data.展开更多
2013年5月,我去听台湾著名诗人非马先生在休斯敦的讲座。他在讲座开始首先朗诵了一首他翻译的美国现代诗人卡洛斯？威廉姆斯（William Carlos Williams）的短诗《场景》（The Act）：＂玫瑰花,在雨里。/别剪它们,我祈求。/它们撑不了多...2013年5月,我去听台湾著名诗人非马先生在休斯敦的讲座。他在讲座开始首先朗诵了一首他翻译的美国现代诗人卡洛斯？威廉姆斯（William Carlos Williams）的短诗《场景》（The Act）：＂玫瑰花,在雨里。/别剪它们,我祈求。/它们撑不了多久,她说/可是它们在那里/很美/哦,我们也都美过,她说,/剪下它们,还把它们交到/我手中。＂非马先生说,展开更多
基金sponsored by the Active Fault Exploration and Earthquake Risk Evaluation Program of City (Grant No. 684[2007],Hebei Provence,China)the Special Earthquake Scientific Research Program,China
文摘Based on detailed field investigations, this paper describes the geometrical characteristics and tectonic activities of the Zhangjiakou fault at the northwest of Beijing. This fault strikes mainly northwest to west, short parts of which strike near east to west, dipping north, and extends over a length of 70km. It is a major geological and geomorphologicai margin, controlling the neotectonic movement in this region. On the south side of the Zhangjiakou fault are the Late Quaternary unconsolidated deposits, forming basins; while on the other side are Mesozoic volcano debris and Pre-Mesozoic metamorphic rocks, forming lower mountains and hills. The Zhangjiakou fault consists mainly of high-angle inverse strike-slip fault and partially of normal strike-slip fault. Among these, the north-dipping NW-NWW-trending secondary faults, constituting the main fracture of the fault, have inverse characteristics; those near the EW-trending secondary faults are links of the former faults, with a smaller length and normal faulting characteristics. Thus, the Zhangjiakou fault is a north-dipping inverse and partially south-dipping normal strike-slip fault. The Zhangjiakou fault has been continuously active since the Quaternary. With the exception of the western end extension, which has been active since the late Pleistocene, the main part of the fault has been active since the Holocene. The central main segment of the Zhangjiakou fault is more active. Since the mid-late period of the late Pleistocene, the average vertical slip rate of a single fault has been over 0. 07mm/a - 0. 30mm/a. The Zhangjiakou fault has multi-slip surfaces, and the total vertical slip rate reaches 1.33mm/a, estimated from the Qingshuihe river terraces and the relevant drilling data.
文摘2013年5月,我去听台湾著名诗人非马先生在休斯敦的讲座。他在讲座开始首先朗诵了一首他翻译的美国现代诗人卡洛斯？威廉姆斯（William Carlos Williams）的短诗《场景》（The Act）：＂玫瑰花,在雨里。/别剪它们,我祈求。/它们撑不了多久,她说/可是它们在那里/很美/哦,我们也都美过,她说,/剪下它们,还把它们交到/我手中。＂非马先生说,
