Lahar is an Indonesian word with its English alternative or equivalent being Lava. That said, it suffices to say Lahar is a volcanic mudflow. That being the case, for a flow to occur, there has to be a slope or a driving force, otherwise it will be stagnant. Because a slope is involved you would expect lahars to be ubiquitous in mountainous terrain. The best case scenario to depict how a Lahar looks like is to picture a mixture of concrete and water moving down a slope at a great speed (Waythomas 2001). Lahars are destructive and catastrophic as they wipe out everything that stands in its way. Its destructive effect can be compared to although not necessarily be on par with an earthquake, cyclone or flood in terms of extensiveness. Figure 1 showing pictures of Philippines student on top of a school house after a Lahar, USGS
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Why? Because it was formed by debris of volcanic origin which of course is also called a Lahar dam. This is the case with the Chakatchna River which was impounded by volcanic debris. The case study for this report is the Mount Spurr volcano which erupted in 1953 and 1992 resulting in the formation of Lahars that impounded the Chakatchna River (Juhle and Coulter, 1955; Meyer and Trabant,
Why? Because it was formed by debris of volcanic origin which of course is also called a Lahar dam. This is the case with the Chakatchna River which was impounded by volcanic debris. The case study for this report is the Mount Spurr volcano which erupted in 1953 and 1992 resulting in the formation of Lahars that impounded the Chakatchna River (Juhle and Coulter, 1955; Meyer and Trabant,