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What triggers tsunami warnings in Japan?
Tsunami warnings in Japan are typically triggered by significant seismic activity, particularly earthquakes with a magnitude of 6.0 or higher. The Japan Meteorological Agency (JMA) monitors seismic data and issues warnings based on the earthquake's location and depth. If an earthquake occurs near the coast, the JMA may issue immediate tsunami alerts to inform the public.
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How effective are Japan's earthquake alert systems?
Japan's earthquake alert systems are highly effective, utilizing a network of seismometers to detect tremors in real-time. The system can send alerts to mobile phones, televisions, and radio broadcasts within seconds of detecting an earthquake. This rapid notification allows people to take cover and prepare for potential aftershocks, significantly reducing the risk of injury.
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What should people know about tsunami preparedness?
Tsunami preparedness involves knowing evacuation routes, having an emergency kit ready, and understanding the signs of a tsunami. Residents should be aware that a strong earthquake can indicate a tsunami risk. It's crucial to move to higher ground immediately after an earthquake and to stay informed through local news and alerts.
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How do earthquake alerts work in real-time?
Earthquake alerts work by detecting seismic waves as they travel through the Earth. The system measures the intensity and location of the quake and calculates the expected impact on nearby areas. Alerts are then disseminated through various channels, allowing people to receive warnings before the shaking reaches them, giving them precious seconds to react.
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What is the Nankai Trough and why is it significant?
The Nankai Trough is a subduction zone located off the coast of Japan, where the Philippine Sea Plate is sliding beneath the Eurasian Plate. This area is significant because experts estimate a 70-80% chance of a major earthquake occurring in the next 30 years. The recent alerts regarding the Nankai Trough highlight the importance of preparedness for potential megaquakes.
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What should I do if I receive a tsunami warning?
If you receive a tsunami warning, it is essential to take immediate action. Move to higher ground away from the coast and stay there until authorities declare it safe to return. Avoid the beach and do not wait to see if a tsunami occurs, as they can arrive within minutes of an earthquake.