3.3. Geological Hazards

Should we consider this is as risky? more risky so, these illustrations I am giving you just to explain that what is the meaning of hazard exposure and vulnerability and how these 3 components define risk in our case, it is kind of disaster risk.

In this chunk, we introduce the concept of risk as it relates to geological hazards. Risk is defined by three main components: hazard, exposure, and vulnerability. A hazard is a potential damaging event, exposure is the degree to which people, property, and infrastructure are subject to that hazard, and vulnerability refers to the susceptibility of those exposed to take damage from hazards. Understanding how these components interact can help us assess the level of risk in different scenarios, especially when discussing disasters.

Think of a house on a hillside. If a landslide occurs but the hillside is uninhabited, the risk is low. However, if the same landslide occurs in a community, the risk increases because there is human exposure and vulnerability to the danger. This situation illustrates how risk can vary based on the context and circumstances surrounding a hazard.

So, here are 3 scenarios; 3 pictures you can see in the left hand side; a landslide happened somewhere where no people are there, no settlements are there so, this is considered to be less risky in another place there are people but not that densely populated settlement, we consider to be more risky or more disastrous than the previous one. In the extreme right, we have another one which is an urban area and disaster landslide took place and more casualty and losses are reported.

This chunk presents three different scenarios to illustrate the concept of risk. The first scenario describes a landslide occurring in a remote area without human presence, demonstrating minimal risk. The second scenario involves a landslide in a sparsely populated area, where the risk is moderately higher due to potential exposure. The third scenario depicts an urban area experiencing a landslide, where the impact is severe, leading to greater casualties and property damage. This progression shows how the same hazard can pose different levels of risk based on human factors.

Imagine three different homes on the same mountain. The first is a cabin alone in the woods, the second is a small house in a nearby village, and the third is an apartment complex in a city. If a rock slide occurs, the cabin suffers no damage, the home in the village might get some minor damage, but the apartment complex could face critical damage and risk to numerous lives. This shows how the same natural event can have drastically different outcomes based on where it happens.

So, hazard is defined as a potentially damaging physical event phenomena or it could be human activity that has some latent conditions that may represent future threats...

Hazards are events or phenomena that have the potential to cause harm, injury, or damage. This definition encompasses both natural occurrences (like earthquakes or hurricanes) and human-made activities (like chemical spills or nuclear accidents). The critical aspect of a hazard is that it may have latent conditions, meaning certain factors might make it more likely to occur in the future or increase its severity. For example, deforestation can increase the likelihood of landslides during heavy rains.

Think of a volcano as a hazard. It lies dormant for years, creating latent conditions. When tectonic activity increases, it might erupt, representing a significant threat. The volcano itself isn't a disaster until it erupts - it's the potential for damage that classifies it as a hazard.

We have different origins like, we have natural hazards which are triggered from natural processes or phenomena occurring in the biosphere that may constitute damaging event...

Natural hazards can be classified based on their origin, including geological, hydro-meteorological, and biological hazards. Geological hazards stem from earth processes, like earthquakes and landslides. Hydro-meteorological hazards involve water and atmospheric events, such as floods and droughts. Biological hazards are related to biological threats like disease outbreaks. Understanding these classifications helps in identifying risks and preparing for potential disasters.

Consider flooding (a hydro-meteorological hazard) after heavy rain, unlike a landslide (a geological hazard) caused by ground saturation. Both are natural hazards, but each derives from different natural processes. By categorizing them, communities can develop specific disaster response plans.

Let us look here, we are talking in the origin and the phenomena; one origin is hydro-meteorological hazards and the phenomena’s are flood, debris and mudflows, tropical cyclones...

Hydro-meteorological hazards are related to water and weather events and can lead to significant damage. They include floods, mudflows, hurricanes, and extreme weather conditions. These hazards often occur suddenly and can cause widespread destruction, affecting infrastructure, the economy, and people's lives. Understanding these phenomena enables better risk management and preparedness efforts.

When a hurricane approaches, it’s like a ticking time bomb; once the rain starts and winds pick up, the risk of flooding and damage becomes exponentially higher. Communities must prepare ahead of time, just like preparing for an examination by studying in advance.

Now, hazards; when we are talking about hazards, we have to consider few characteristics of the hazards or features when we are talking about disaster recovery or disaster risk management...

When assessing hazards, it is important to consider their frequency (how often they occur), duration (how long they last), and extent (the area they cover). These characteristics help in planning disaster risk management strategies and recovery efforts. For example, knowing a region frequently experiences flooding allows for better emergency preparedness and infrastructure planning.

Consider a river that floods every spring; recognizing this pattern enables local authorities to build levees or create flood zones to mitigate impact. By understanding the timing and scope of hazards, communities can defend against their potentially devastating impacts.

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