Risk analysis of soil liquefaction Using SWM in the South Plains area of the river Gorgan, Golestan Province

Natural hazard risk assessment helps decision makers for planning and prioritizing disaster management strategies. This paper focuses on the prediction of different scenarios and assessing the risk of soil liquefaction. The vulnerability of the elements due to soil liquefaction was determined.
The Gorgan state (1600 km2), Golestan Province, Iran was considered as a case study for assessing the vulnerability due to this phenomenon. Soil deposits map, ground water depth, and the earthquake acceleration map (based on the occurred historical earthquake points) have been prepared for this study. An empirical liquefaction model as a function of the three studied variables was used to model the liquefaction in four hazard classes using the ArcGIS software. Possible scenarios were determined considering the potential of superposing the peak rate of the ground acceleration and water depth. The area of liquefied zones was estimated using the geographical information systems (GIS). In this study , the collection of data and digital maps using ArcGIS software base as well as three-parameter model SWM, soil liquefaction hazard zonation map of the area south of Gorgan in Golestan province in Slvlhay30Ï30 were prepared . According to the results of without risk to very high risk potential that the area most studied in class is without risk. Aq Qala city limits because of the proximity to the center -discharge is too high earthquake hazard class, and because Gorganrood the scope of this town passes increases the probability of liquefaction.