Introduction: Why learn about "Disaster Prevention" and "Field Research"?
Hello everyone! This chapter on "Disaster Prevention and Field Research in Daily Life" is a crucial part of geography because it directly relates to "protecting our own lives."
While Japan is surrounded by beautiful nature, it is also a country prone to natural disasters like earthquakes and typhoons. By studying geography, you will develop the skills to predict "where the dangers are?" and "how can we minimize the damage?"
You might think, "That's a lot to memorize..." at first, but don't worry! Let’s go through it together while imagining the town you live in.
1. Three Keywords for Protecting Yourself from Disasters
When thinking about disaster prevention, the foundation lies in these three concepts: "Self-help," "Mutual aid," and "Public support." Remember these as a set!
① Self-help (Jijo): Protecting your own life yourself. This includes preparing emergency supplies and checking evacuation routes.
② Mutual aid (Kyojo): Helping each other with neighbors and members of your community. This includes cooperation at evacuation shelters.
③ Public support (Kojo): Rescue and support provided by government offices, police, fire departments, the Self-Defense Forces, etc.
【Pro Tip!】
Immediately after a major disaster, emergency services (public support) may not be able to arrive right away. That is why "Self-help" and "Mutual aid" are said to be extremely important.
2. Major Natural Disasters in Japan
Due to its topography and climate, Japan is prone to various types of disasters.
A. Earthquakes and Tsunamis (Topographical Factors)
Japan is located where four tectonic plates meet, making it one of the most earthquake-prone countries in the world.
・Watch out for the difference between Seismic Intensity and Magnitude!
This is a common point of confusion. Magnitude refers to the "total size (energy) of the earthquake itself," while seismic intensity refers to the "strength of the shaking at each specific location."
Example: Think of the brightness of the lightbulb itself as "Magnitude," and the brightness on your desk as "Seismic Intensity"!
B. Meteorological Disasters (Climatic Factors)
These are damages caused by typhoons and localized heavy rainfall.
・Sediment Disasters: Landslides, debris flows, etc. Since about 70% of Japan’s land is mountainous, these can occur almost anywhere.
・Flooding: Overflowing of river water. Because many Japanese rivers are "short and steep," the water level can rise rapidly during heavy rain.
【Did you know?】
You often hear the term "Linear Precipitation Belt" in the news lately. This is a phenomenon where cumulonimbus clouds, which bring intense rain, form one after another and stay over the same area for a long time.
3. Master the Hazard Map!
The best tool to understand what risks exist where you live is the "Hazard Map (Disaster Risk Map)."
What you can check on a hazard map:
・Areas at risk of flooding and the potential water depth
・High-risk areas for sediment disasters
・Locations of evacuation sites and shelters
【Let's try it! Steps for reading a hazard map】
1. First, find the location of your home or school.
2. Check the colored areas (usually, darker colors indicate higher levels of risk).
3. Check the route to a nearby "evacuation shelter" (try to imagine if there are any roads that might be blocked due to collapsed bridges or flooding).
4. How to Conduct Field Research (Fieldwork)
Beyond just learning from textbooks, walking through an area yourself to study it is called "Fieldwork" (Junken). Here is the procedure for conducting a local survey.
Step 1: Preparation
Gather topographic maps, aerial photos, and hazard maps. By comparing old maps with current ones, you might make discoveries like, "This area was a pond in the past, so the ground might be unstable."
Step 2: Field Investigation
Walk around and use your five senses to observe:
・Are there any steep slopes?
・Is the road wide enough? (Can a fire truck get through?)
・Where are the disaster prevention warehouses and fire hydrants located?
Step 3: Summary and Analysis
Organize your findings on a map. This is called a "Disaster Prevention Map." Sharing this information with people in your community helps strengthen the "Mutual aid" aspect.
【Common Mistake】
"Evacuation Place" and "Evacuation Shelter" are different!
・Evacuation Place (Hinansho): A spot to temporarily escape immediate threats like tsunamis or fires to save your life (e.g., parks or open squares).
・Evacuation Shelter (Hinanjyo): A place where people who cannot return home live for a certain period (e.g., school gymnasiums or community centers).
5. The Concept of "Disaster Mitigation"
Recently, we use the term "Disaster Mitigation" (Gensai) alongside "Disaster Prevention." While it is difficult to prevent disasters 100%, this is a realistic and essential mindset focused on "minimizing the damage" through prior preparation.
For example, securing furniture and practicing "rolling stock" for emergency food (regularly eating and replenishing your stockpile) are daily habits that contribute to disaster mitigation.
Summary: Key Points of this Chapter
・Understand the roles of "Self-help, Mutual aid, and Public support"!
・Japan is a country where disasters occur easily due to both its topography and climate.
・Use hazard maps to understand the risks around you!
・By doing field research, you can discover dangers and clever solutions that aren't visible on a map alone.
Learning geography isn't just about memorizing facts; it becomes deeper and more fun when you apply it to your own life. It might feel difficult at first, but start by checking the hazard map for the area around your house! I'm rooting for you!