GEOL 106 Chapter Notes - Chapter 4: Nevado Del Ruiz, Lake Nyos, Debris Flow
6 Nov 2018
School
Course
Professor
Document Summary
Toxic concentrations of hazardous gases rarely reach populated areas: exception: lake nyos in cameroon co2 gas accumulation, additional pipes with degassing fountains will be needed to adequately reduce the hazard. Most serious secondary effects of volcanic activity: debris flows and mudflows (lahar: indonesian name) lahars: produced when large amounts of loose volcanic ash and other tephra are saturated with water, become unstable, and suddenly move downslope. Debris flows differ from mudflows in that they are coarser more than half of their particles are larger than sand grains. Unlike pyroclastic flows, lahars can occur without an eruption and are generally low temperature flows. Mudflows gigantic mudflows have originated on the flanks of volcanoes in the pacific northwest in both historic and prehistoric times. Dangerous lahars can occur quickly and with little warning, so people must be alerted immediately . Landslides volcanic landslides are another secondary effect of volcanic activity they may be triggered by events other than eruption (like lahars)
