Types and distribution of secondary volcanic hazards and their relationship with volcanic geology in Changbaishan-Tianchi and its adjacent areas
Based on the mapping results of volcanic geology and secondary volcanic hazards in Changbaishan-Tianchi and its adjacent areas, from the aspects of lithology, fracture, landform, geomorphology and water sys-tem, the correlation between the geological characteristics of volcanic products and the secondary volcanic hazards caused by these volcanic products is analyzed.The research shows that the rock collapses occur in the hard rock with columnar joints, as multiple volcanic eruptions and associated seismic activities denudate the loose accumula-tion between hard rock layers, and the rock mass loses stability and collapse.Steep slope landforms also collapse under earthquakes.The soft rocks and loose accumulation of sediment are eroded away by water and cut down by the valley, forming open sliding space in the front edge of the slope on both sides of the river, and the volcano earthquakes induce mountain deformation, which damages the slope rock mass structure and results in landslides. Fragments from early volcanic eruption and debris generated by landslides are important material sources of volcanic debris flow, while flood disasters caused by volcanic eruptions or strong earthquakes, together with landform and geomorphology, play a key role in the formation, transportation and distribution of volcanic debris flows.
Changbaishan-Tianchi and its adjacent areasvolcanic geologysecondary volcanic hazardscorrelation
NETL
NSTL
万方数据
维普
