Landslide

1. Landslides are a type of "mass wasting," where soil and rock move down-slope due to gravity.
2. Landslides can be caused by a combination of factors, such as rainfall, snowmelt, changes in water level, and human activities.
3. There are five modes of slope movement, including falls, topples, slides, spreads, and flows, which vary depending on the type of geologic material.
4. Debris flows and rock falls are common types of landslides.
5. Landslides can also occur underwater, known as submarine landslides, and sometimes cause tsunamis.
6. Landslides occur when down-slope forces exceed the strength of the earth materials that compose the slope.
7. Slopes already on the verge of movement are more susceptible to landslides, which can be induced by earthquakes, volcanic activity, and stream erosion.
8. There are four main types of movement: falls, topples, slides (rotational and translational), and flows.
9. Landslides can involve just one of these movements or a combination of several.
10. Geologists also consider the type of material involved in the movement, such as rock, debris, or earth.
11. Falls are landslides that involve the collapse of material from a cliff or steep slope.
12. Falls usually involve a mixture of free fall through the air, bouncing, or rolling.
13. Topple failures involve the forward rotation and movement of a mass of rock, earth, or debris out of a slope.
14. A topple often results in the formation of a debris cone at the base of the slope, called a talus cone.
15. A slide-type landslide is a downslope movement of material that occurs along a distinctive rupture or slip surface.
16. The slip surface in a slide-type landslide tends to be deeper than that of other types of landslides and not structurally controlled.
17. Slides can be either rotational or translational in nature.
18. Rotational slides occur when the slip surface is listric (curved or spoon-shaped).
19. Translational slides occur along a distinctive planar surface of weakness such as a fault, joint, or bedding plane.
20. Flows are landslides that involve the movement of material down a slope in the form of a fluid.
21. Different types of flows include mud, debris, and rock (rock avalanches.

Comments

How to find drugs against the Corona. Covid 19

FOR SCIENTISTS (and others interested): How to find drugs against the coronavirus: First clues on how we can beat COVID-19. This shows the many ways we can interfere with its replication cycle by repurposing existing drugs - summarized in today's Science journal. LINK TO ARTICLE: https://science.sciencemag.org/content/367/6485/1412 .... Vineesh V Assistant Professor of Geography, Directorate of Education, Government of Kerala. https://g.page/vineeshvc

Disaster Management

1. Disaster Risk Analysis → Disaster Risk Reduction → Disaster Management Cycle Disaster Risk Analysis is the first step in managing disasters. It involves assessing potential hazards, identifying vulnerable populations, and estimating possible impacts. Once risks are identified, Disaster Risk Reduction (DRR) strategies come into play. DRR aims to reduce risk and enhance resilience through planning, infrastructure development, and policy enforcement. The Disaster Management Cycle then ensures a structured approach by dividing actions into pre-disaster, during-disaster, and post-disaster phases . Example Connection: Imagine a coastal city prone to cyclones: Risk Analysis identifies low-lying areas and weak infrastructure. Risk Reduction includes building seawalls, enforcing strict building codes, and training residents for emergency situations. The Disaster Management Cycle ensures ongoing preparedness, immediate response during a cyclone, and long-term recovery afterw...

History of GIS

The history of Geographic Information Systems (GIS) is rooted in early efforts to understand spatial relationships and patterns, long before the advent of digital computers. While modern GIS emerged in the mid-20th century with advances in computing, its conceptual foundations lie in cartography, spatial analysis, and thematic mapping. Early Roots of Spatial Analysis (Pre-1960s) One of the earliest documented applications of spatial analysis dates back to 1832 , when Charles Picquet , a French geographer and cartographer, produced a cholera mortality map of Paris. In his report Rapport sur la marche et les effets du choléra dans Paris et le département de la Seine , Picquet used graduated color shading to represent cholera deaths per 1,000 inhabitants across 48 districts. This work is widely regarded as an early example of choropleth mapping and thematic cartography applied to epidemiology. A landmark moment in the history of spatial analysis occurred in 1854 , when John Snow inv...

Scope of Disaster Management

Disaster management refers to the systematic approach to managing and mitigating the impacts of disasters, encompassing both natural hazards (e.g., earthquakes, floods, hurricanes) and man-made disasters (e.g., industrial accidents, terrorism, nuclear accidents). Its primary objectives are to minimize potential losses, provide timely assistance to those affected, and facilitate swift and effective recovery. The scope of disaster management is multifaceted, encompassing a series of interconnected activities: preparedness, response, recovery, and mitigation. These activities must be strategically implemented before, during, and after a disaster. Key Concepts, Terminologies, and Examples 1. Awareness: Concept: Fostering public understanding of potential hazards and appropriate responses before, during, and after disasters. This involves disseminating information about risks, safety measures, and recommended actions. Terminologies: Hazard Awareness: Recognizing the types of natural...

GIS data continuous discrete ordinal interval ratio

In Geographic Information Systems (GIS) , data is categorized based on its nature (discrete or continuous) and its measurement scale (nominal, ordinal, interval, or ratio). These distinctions influence how the data is collected, analyzed, and visualized. Let's break down these categories with concepts, terminologies, and examples: 1. Discrete Data Discrete data is obtained by counting distinct items or entities. Values are finite and cannot be infinitely subdivided. Characteristics : Represent distinct objects or occurrences. Commonly represented as vector data (points, lines, polygons). Values within a range are whole numbers or categories. Examples : Number of People : Counting individuals on a train or in a hospital. Building Types : Categorizing buildings as residential, commercial, or industrial. Tree Count : Number of trees in a specific area. 2. Continuous Data Continuous data is obtained by measuring phenomena that can take any value within a range...

Vineesh V, Geography

Search This Blog