【摘要】 通过对甘肃省庆阳市、平凉市5.12汶川大地震地质灾害实地调查,发现此次地震造成的崩塌和滑坡,以小型为主,数量众多,主要分布在现代侵蚀沟边缘部位的断崖和陡坡上。地震在塬面、缓坡丘陵和川台地上所造成的崩塌,与窑洞住宅和采矿业的分布基本一致。此次地震虽未造成大中型崩塌和滑坡,但对该地环境的影响不能忽视——可改变微地貌、使未来几年内的土壤流失量有所增加等。认为在黄土高原地区,地震烈度到达Ⅳ度以上,就会引起较为严重的重力侵蚀。对于我国地震高发区之一的黄土高原而言,探讨水土流失的成因时,须要关注地震的影响。更多还原

【Abstract】 This paper is based on the field investigation of the geological disaster that caused by the 5.12 Wenchuan Earthquake in Qingyang City and Pingliang City,Gansu Province.It is found that the earthquake-induced collapses and landslides are charcterized by small type and large number and are mainly distributed at the of the edges of modern erosion ditch;The earthquake-induced landslides distributed in the tableland surface,gentle slope hills and tableland of the valley,is consistent with the cave dwelling and the engineering construction.Although this earthquake has not caused large or medium-sized landslip,we cnnont neglect the influence of its natural environment,which may change the micro physiognomy and increase the soil erosion etc.in the next few years.It indicates that it will cause more serious gravity erosion once the earthquake intensity over degree Ⅳ in the Loess Plateau area,which slightly has the difference from the former general recognition.For the Loess Plateau that is one of the frequent earthquake areas in China,effects of the earthquakes need to be considered when the genesis of soil erosion discussed.更多还原