Here is a concise summary of the provided text:
**Title:** Preparing for Urban Tsunamis: Research, Simulation, and Evacuation Strategies
**Key Points:**
1. **Tsunami Research**: Japan is developing AI-powered tsunami prediction systems using the world's best supercomputer, Fugaku, to simulate urban tsunami scenarios.
2. **Urban Tsunami Threats**: Tsunamis in cities can cause unpredictable damage, with water flowing through roads, between buildings, and into underground spaces.
3. **Osaka's Vulnerability**: Osaka's unique urban structure, surrounded by rivers, and low-lying areas make it prone to severe tsunami damage and flooding.
4. **Evacuation Challenges**: Effective evacuation is crucial, but can be hindered by chaos, distance to safety (e.g., 3 km to nearest higher ground in Umeda), and limited time (approximately 110 minutes).
5. **Technological Solutions**: A prototype smartphone app, utilizing Fugaku's predictions, aims to provide personalized evacuation guidance, including location sharing for family and friends.
**Core Message:** Prepare now for the inevitability of massive earthquakes and tsunamis, especially in vulnerable cities like Osaka, by leveraging advanced research, simulation, and evacuation technologies to save lives.
Here are the key facts extracted from the text, numbered and in short sentences:
1. **Nankai Trough Giant Earthquake**: A potential earthquake that could trigger a massive tsunami.
2. **Great East Japan Earthquake (2011)**: Served as a learning experience for tsunami prediction and preparation.
3. **Tsunami Height**: Can easily exceed 10 meters in height after violent shaking.
4. **River Chinami Phenomenon**: Tsunami waves can flow backwards up a river, observed in 75 rivers during the Great East Japan Earthquake.
5. **Maximum Upstream Distance**: Tsunamis reached up to 49 kilometers away from the river mouth in some cases.
6. **Tsunami Monitoring Increase**: Japan's coastal waters have seen a 1.8 times increase in observation points since the Great East Japan Earthquake.
7. **AI-Powered Tsunami Prediction**: Fujitsu developed an AI (using supercomputer Fugaku) that can predict tsunamis in urban areas within one second.
8. **Real-Time Tsunami Prediction**: Now possible thanks to the aforementioned AI development.
9. **Urban Tsunami Characteristics**: Tsunamis in cities can flow through roads, between buildings, and into underground spaces, making their path unpredictable.
10. **Flood Water Level Risk**: Levels may be higher than previously assumed, especially in areas with many buildings and structures.
11. **Osaka's Vulnerability**: The city's unique urban structure and low-lying areas make it prone to tsunami damage.
12. **Underground Shopping Mall Risk**: Tsunamis can quickly flood these areas, as seen in simulations for Umeda's underground mall.
13. **Evacuation Challenges**: Smooth evacuation can be difficult in chaotic situations, highlighting the need for designated tsunami evacuation buildings.
14. **Tsunami Evacuation Building Importance**: Crucial for saving lives, especially in areas with limited high-ground options.
15. **Smartphone App Development**: Fujitsu is creating an app that provides personalized tsunami predictions, including time, location, and height.
16. **Family/Friend Location Sharing**: The app allows users to register and track the location of loved ones during an emergency.
17. **Liquefaction Risk in Osaka**: The city's soft ground increases the risk of liquefaction, which can exacerbate tsunami damage.
18. **Levee Limitations**: May not be effective in preventing tsunami damage, especially if compromised by earthquakes or liquefaction.