What is a geohazard map?
Geohazard maps are specialized maps that indicate the hazard susceptibility of areas. These maps are useful for disaster preparedness and management. The geohazard maps developed by MGB contain information on areas susceptible to rain-induced landslides and flooding.
What is the meaning of geohazard?
Geological hazards
Geological hazards (or geohazards) are the results of natural, active geologic processes. Geohazards include: volcanic eruptions, earthquakes, mudslides or landslides, avalanches, glacial surges and outburst floods, tsunamis, and other land collapses due to thawing permafrost.
What is landslide mapping?
A landslide susceptibility map identifies areas which are subject to landslides and is measured from low to high. The landslide susceptibility map takes into account where the landslides occur and what causes them (slope, soil type and the impact of the flow of water in an area).
What are the different elements of a geohazard map?
A geological hazard map is a map indicating the areas that are vulnerable to hazards caused by earthquakes, volcanic eruptions, and landslides. It helps the public be informed and prepared for the geological hazard. You must take note of the title, symbols and legend, and source when studying a geological hazard map.
Why is geohazard map important?
The purpose of the geohazard maps is to inform the end-users on the susceptibility of their areas to landslide and flooding, thus, the potential risks to communities.
What is the primary purpose of geohazard map among local governments *?
The Department of Environment and Natural Resources-Mines and Geosciences Bureau (DENR-MGB) has been implementing the National Geohazard Assessment and Mapping Program with the primary objective to identify areas in the country that are susceptible or prone to various geologic hazards and provide the vital information …
What causes geohazard?
These geohazards arise from global geological processes inside the Earth, driving deformation and displacement of its crust. Underneath the thin crust the Earth consists of a sticky fluid of melted rock we call the mantle that undergoes convection that turns and twists like boiling water, causing the crust to move.
What is the process that causes geohazard?
Eruptions may trigger lahars by quickly melting snow and ice on a volcano or ejecting water from a crater lake. Lahars are also formed by heavy rainfall during or after an eruption, when volcanic ash is washed off the volcano. Some of the largest lahars begin as landslides.
How is a landslide hazard map prepared?
These thematic map were prepared by using topographic maps and aerial photographs taken by the Department of Survey, Government of Nepal. Field surveys were carried out to prepare landslide inventory, soil type, soil depth and landuse maps. During survey landslides were plotted to the topographic map of 1:50,000.
Why do geohazard maps use colors?
The geo-hazard map developed by the Mines and Geosciences Bureau of the Department of the Environment and Natural Resources (MGB-DENR) uses colour to classify areas as either low, moderately or highly susceptible to floods, flash floods and landslides. Some areas are marked as being prone to riverbank erosion.
How does the geohazard map help a community?
A geohazard map indicates areas that are susceptible to floods and landslides, as determined by the Mines and Geosciences Bureau (MGB). The website www.irinnews.org has an excellent article about the launch of the geohazard maps for public use last January 2012.
What is the main objective of the geohazards program?
Main objective: To identify areas in the country which are susceptible or vulnerable to various geologic hazards, or geohazards. The program also seeks to provide information to various stakeholders in order to lessen or mitigate the impact of these events.
What is the difference between geohazards and geological hazards?
A geological hazard, such as the risk of a landslide or tsunami. A geohazard is a geological state that may lead to widespread damage or risk. Geohazards are geological and environmental conditions and involve long-term or short-term geological processes.
How do I get a geohazard map from MGB?
Geohazard map icons on the MGB webpage. The “Geohazard Web Portal” icon uses online base maps accessed from the Philippine Geoportal System of the National Mapping and Resource Information Authority, while the “Geohazard Map Visualization on Google” utilizes Google Street Map and Google Earth. Geohazard map with Google Street Map as base map.