【摘要】 金龙顶子火山是吉林龙岗火山群全新世喷发规模最大的火山。前人研究表明,该地区火山活动活跃,具有潜在喷发危险。通过对金龙顶子火山机构的解析,确定历史火山灾害类型主要有火山溅落灾害、空降火山渣灾害和熔岩流灾害等。在限定金龙顶子火山未来再次喷发类型和规模与上次相当的条件下,火山溅落灾害局限于火口2km范围内;空降火山渣灾害,距火口2~9km为高危险区,9~14km为中危险区,14~18km为低危险区;使用Volcflow模型对熔岩流进行模拟,结果表明熔岩流主要分布在金龙顶子火山周围低洼地带。更多还原

【Abstract】 Longgang volcano cluster is 150 km away from the Tianchi volcano,located in Jingyu and Huinan Counties,Jilin Province,China.It had a long active history and produced hundreds of volcanoes.The latest and largest eruption occurred between 1 500 and 1 600 years ago by Jinlongdingzi(JLDZ)volcano which had several eruptions in the history.This paper discusses the volcanic hazard types,and using the numerical simulations of lava flow obtained with the Volcflow model,proposes the hazard zonation of JLDZ volcano area.JLDZ volcano eruption type is sub-plinian,which produced a great mass of tephra fallout,covering an area of 260km~2.The major types of volcanic hazards in JLDZ area are lava flow,tephra fallout and spatter deposits.Volcflow is developed by Kelfoun for the simulation of volcanic flows.The result of Volcflow shows that the flows are on the both sides of the previous lava flows which are low-lying areas now.According to the physical parameters of historical eruption and Volcflow,we propose the preliminary volcanic hazard zonation in JLDZ area.The air fall deposits are the most dangerous product in JLDZ.The highly dangerous region of spatter deposits is limited to a radius of about 2km around the volcano.The high risk area of tephra fallout is between 2 km to 9km around the volcano,and between 9km to 14 km is the moderate risk area.Out of 14 km,it is the low risk area.Lava flow is controlled by topography.From Jinchuan Town to Houhe Village near the volcano is the low-lying area.If the volcano erupts,these areas will be in danger.更多还原