摘要：Loesses are fine grain sediments of quaternary period with separated and unattached structures. These deposits do not contain cement, but due to the excessive presence of clay and lime minerals, reach to a special adhesiveness providing the capability of remaining over even an angle of 90 degrees section. However, Loesses are of falling soils and saturation of soil may result in sudden and accumulative movements. The city of Gorgan is located in the south part of Loessic lands of east-north of Iran with humid climate. The urban population of the city has increased, leading to an increase in outnumbered human activities such as: construction of multi-floor buildings on Loessic hills, construction of villas in Naharkhoran valley, changing of forest lands of south part of the city for construction, changing the type of natural plants for gardening and agricultural operations and other developmental activities like road construction on Loessic lands and removing Loessic soils for use in other industries (like break making). All these human activities as well as an increase in rain falls in south parts (higher parts) and the rate of salts and minerals in loess of the region have made the loesses unstable and have increased the possibility of widespread movements like Solifluction and slippage. Therefore in this article, a survey of human and natural factors and geomorphologic endangerments of unstable environment of Gorgan has been conducted, the effects of these processes over feeble loessic deposits of the region are considered and appropriate strategies for the possible control of the situation will be offered
关键词：loess; Geomorphology; land slide; Solifluction; Geomorphic
