2.1. Nature and Impacts of Hazards

Should we consider this as risky? More risky? 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.

This part introduces the concept of risk in terms of hazards, exposure, and vulnerability. Hazards are defined as potential damaging events. Exposure involves the presence of people or properties in harm's way, and vulnerability is how susceptible they are to damage when a hazard occurs. Together, they create a framework through which we can evaluate the risk of disasters.

Think of a small fire in a remote area with no houses nearby (low risk) versus a fire in a densely populated neighborhood (high risk). The first scenario has low exposure and vulnerability, while the second has high exposure and vulnerability, illustrating how these factors affect overall risk.

Now, this one is considered to be risky, and with this stone can fall, if we have rainfall; heavy rainfall or if we have an earthquake, then it will come and hit this place so, it has some kind of conditions; some latent conditions that may trigger some threat in future and can have different origins, it could be earthquake, it could be landslides, it could be heavy rainfall. 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 and can have different origin but also it may cause the loss of life of injury, property damage, social and economic disruption and environmental degradation.

This chunk defines hazards more thoroughly, highlighting the potential for damage from physical events or human activities. It emphasizes that hazards can arise from natural occurrences, but they can also be triggered by our actions (like building in a risky area). The mention of latent conditions points out that some hazards are waiting to happen and can be triggered by certain events.

Consider a dormant volcano. While it might not pose an immediate risk, if enough pressure builds up, it can erupt, causing significant harm. This is similar to how many hazards actually have potential triggers that can activate them.

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 according to their geological, hydro-meteorological, and biological origin.

Natural hazards fall into three primary categories based on their origin: geological (like earthquakes and tsunamis), hydro-meteorological (like floods and storms), and biological (like epidemics). Understanding these classifications helps in better preparation and response to potential disasters.

Think of a toolbox: just as a toolbox has different tools for different tasks, natural hazards can be classified into types so that we can apply the right approaches to manage or mitigate each type effectively.

Let us look here, we are talking in the origin and the phenomena; one origin is hydro-meteorological hazards and the phenomena are flood, debris and mudflows, tropical cyclones, storm surge, wind, rain and other severe storms, lightning. Also, we have drought, desertification, wildland fires, temperature extremes, sandstorms, or we have more snow avalanches so, these are all considered as hydro-meteorological hazards.

Hydro-meteorological hazards are largely related to weather and climate events. This section lists specific hazards like floods, storms, and droughts that affect communities. Recognizing these helps us understand the broader impacts of climate change and planning for future risks.

Imagine a region that experiences heavy rainfall and predictable floods every year. The community can have measures in place—like building levees or flood exits—to reduce the impact, just as someone personalizes their umbrella for their city’s rainy climate.

We have also geological hazards, these are considered to be natural earth processes or phenomena that include processes of endogenous origin or tectonic or exogenous origin such as mass movement. They are like earthquake, tsunami, volcanic activity, emissions, surface collapse, geological fault activity, mass movement, landslide, rock slides, liquefactions, all are considered to be geological hazards.

Geological hazards result from natural earth processes that can cause significant destruction. They can lead to events such as earthquakes, landslides, and volcanic eruptions, proving essential for communities to prepare for and respond to such natural threats.

Think of geological hazards like the unpredictable tide; while it can be lively and beautiful, it can also be destructive, eroding beaches, damaging coastlines, and destroying properties. Just because they are natural doesn't mean we shouldn't prepare for them.

We have also biological hazards like outbreaks of epidemics or some kind of animal contaminations or extensive infestations, these are considered to be biological hazards.

Biological hazards encompass events that can cause harm to human health through pathogens or infestations. The risks can come from diseases spreading among animal populations or human populations. Recognizing these helps facilitate prompt responses to outbreaks, ensuring public health safety.

Consider how quickly a nasty cold can spread in a classroom. If one student gets sick, a chain reaction can lead to a class full of sick students. Similarly, biological hazards can have a snowball effect if not dealt with promptly.

We are also not very related to here, but we can also consider some technological hazards can happen through disasters and also some environmental degradations which can also cause disasters.

Technological hazards arise from human-made systems or processes that can lead to accidents, such as oil refinery explosions or exposure to harmful chemicals. Environmental degradation, while not technically a disaster, affects the ecosystem and can increase the likelihood of natural disasters. Both categories highlight the risks associated with human activity.

Think of a factory that pollutes a river. It damages the environment around it and could lead to poor health and loss of biodiversity, just like how poor farming methods can deplete soil quality, leading to less crop yield.

If you look into the disaster distributions, different kinds of disasters or hazards in different countries, the most affected people and killed are in low-income countries and the least in high-income countries.

This section highlights how disaster impacts differ based on economic status. Low-income countries are often the most affected by disasters, largely because they have fewer resources for disaster preparedness and recovery, leading to a higher toll on lives and properties.

Imagine two towns after a flood. One has a strong infrastructure and emergency services, while the other has old buildings and no resources. The outcome will differ significantly, illustrating how preparedness can save lives and property.

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. One is the frequency of the hazards; how often is the event likely to happen, and then is the duration of the hazard; the length of time that when it happened how long it continued, an extent; the size of the area where it took place.

The section discusses the essential characteristics of hazards that are important for understanding and managing disaster risks—frequency (how often they occur), duration (how long they last), and extent (the geographical area affected). These factors help us plan and respond effectively to hazards.

Think of weather patterns: a place prone to frequent but short rain showers requires different preparation than a location that might face infrequent but severe floods. Recognizing these characteristics helps communities tailor their disaster responses.

--