일본, 강진 이후 100회 이상의 여진으로 흔들려

When the ground shakes beneath your feet, your first thought is to get to safety. But in Japan last week, that moment of fear was just the beginning. A powerful earthquake struck, and the danger did not stop when the shaking stopped. Instead, the earth continued to move. More than 100 aftershocks followed the main quake, some strong enough to cause serious concern.

After a large earthquake, the ground remains unstable. Think of it like this: the earth's plates have suddenly shifted, and now they are still settling into their new position. This settling creates smaller earthquakes called aftershocks. They can happen for days, weeks, or even months after the main event. The problem is that nobody can predict exactly when the next one will hit or how strong it will be.

Japan's officials issued urgent warnings to the public. They told people to stay vigilant and keep emergency supplies nearby. The reason is simple but serious: some aftershocks can reach magnitude 7 — almost as powerful as the original earthquake itself. A magnitude 7 earthquake can cause buildings to collapse, start fires, and trap people. This is not a minor problem. This is a real danger that can repeat many times over.

The initial quake killed at least 13 people and injured many others. Rescue teams worked around the clock to find survivors in damaged buildings. Hospitals treated the injured. But as the aftershocks continued, rescue workers faced new challenges. A strong aftershock could bring down a weakened building while people were still inside trying to escape or help others. The job became more complicated and more risky.

What makes this situation especially difficult is the psychological impact. After feeling a major earthquake, people are naturally nervous. Each aftershock brings back the fear and stress of that first terrible moment. Residents must balance the need to stay alert with the need to function and rest. Children especially can struggle with this kind of ongoing stress and uncertainty.

Experts emphasize that preparation is key. Japanese families and businesses practice earthquake drills regularly, and they keep emergency kits ready. These kits typically include water, food, first aid supplies, and a battery-powered radio. During aftershock sequences like this one, having these items easily accessible becomes even more critical. Being prepared can mean the difference between staying safe and getting hurt.

The days after a major earthquake teach us something important: the disaster does not always end when we think it does. In Japan, people know this lesson from experience. They continue to monitor, prepare, and support each other through these uncertain days. Have you ever experienced a natural disaster, or lived somewhere that is prone to earthquakes? What would you do differently if you knew strong aftershocks were possible in your area?

Inspired by reporting from BBC News.