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Each city is ranked according to its potential for earthquakes, storms, storm surges, tsunamis, and river floods. For each type of disaster, Swiss Re devised an extreme weather scenario in which defenses fail and the human and economic toll can be enormous.
Further, each city was ranked based on the effect each scenario would have on its residents by combining population-distribution data and vulnerability estimates for each disaster.
The scenarios consider fatalities, injuries, evacuations, those whose homes would be damaged or destroyed, and those who would be unable to access their workplace.
10. Tehran, Iran
15.6 million people potentially affected.
Tehran sits on one of the most dangerous fault lines in the world — the North Anatolian fault. The entire population of the city is heavily exposed to earthquakes.
9. Los Angeles, U.S.
A portion of the Bullock's department store in the Northridge Fashion Center collapsed after a severe earthquake struck Southern California in 1994. AP / Press Association Images
AP / Press Association Images / Press Association Images
16.4 million people potentially affected.
Los Angeles, like much of California, sits along the San Andreas Fault, making it one of the most earthquake-prone places in the world; 14.7 million people are at risk directly of earthquakes at any given time in the city
8. Shanghai, China
16.7 million people potentially affected.
Shanghai, China’s most populated city, is located on the Yangtze River Delta, making it vulnerable to serious flooding from storms and typhoons. Its long coastline and the large volume of water flowing through the city make it especially at risk.
7. Kolkata, India
Monsoon clouds hover over as a couple fetch water from the Ganges river in Kolkata. AP Photo / Bikas Das
AP Photo / Bikas Das / Bikas Das
17.9 million people potentially affected.
Kolkata is situated near the world’s largest river delta, which makes it susceptible to flooding nearly every year. The drainage system, which is more than 140 years old, covers less than half of the city. Cyclones, tsunamis, and storm surges could also affect the city, which is ill prepared to deal with a natural disaster.
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6. Nagoya, Japan
Heavy construction machines break up concrete of the toppled freeway in the Eastern Nada section of Kobe after an earthquake in 1995. AP Photo / Sadayuki Mikami
AP Photo / Sadayuki Mikami / Sadayuki Mikami
22.9 million people potentially affected.
Many of Japan’s major cities are situated directly along the Ring of Fire, a continuous series of active fault lines that account for 90% of the world’s earthquakes. Tsunamis — caused or compounded by earthquakes — are a major risk in Nagoya, where they have the potential to be devastating.
5. Jakarta, Indonesia
27.7 million people potentially affected.
A lack of planning can exacerbate the effects of natural disasters, a phenomenon which has taken root in Jakarta. Rains, insufficient drainage, and the fact that 40% of Jakarta is below sea level ensure that the city continually experiences floods.
The government agreed to build two dams this year to help matters, but that does nothing to ease the other dangers that Jakarta faces — namely earthquakes. Situated near a fault line, Jakarta is prone to earthquakes, which are magnified by the soft, poorly drained soil.
4. Osaka-Kobe, Japan
32.1 million people potentially affected.
In 1995, the Great Hanshin earthquake devastated the Osaka-Kobe area, killing more than 6,000 people and causing $100 billion in damage. Another earthquake like that could easily hit again, and the city wouldn’t be much more prepared. Because the city is on a coastal plain, the area is vulnerable to storm surges and ranks third for cities at risk of tsunamis.
The urban density of the Pearl River Delta is unprecedented. Centered on vast floodplains are the massive cities of Shenzhen, Hong Kong, Dongguan, Macau, and Ghangzhou. It’s the No. 1 area at risk for storm surge, the third highest for cyclonic wind damage, and the fifth highest for river floods.
2. Manila, Philippines
34.6 million people potentially affected.
Manila may have gotten lucky during super Typhoon Haiyan, dodging the worst that the storm had to offer, but next time it might not be. Nearly half of Manila’s population is seriously at risk of earthquake damage and the city is severely affected by high wind speeds and severe storms. Flooding has become a near-annual disaster, plaguing the city in 2012 and 2013.
1. Tokyo-Yokohama, Japan
Black smoke billows from a building in Tokyo's Odaiba waterfront area after a powerful earthquake hit Japan in 2011. AP / Press Association Images
AP / Press Association Images / Press Association Images
57.1 million people potentially affected.
The Tokyo-Yokohama region is at severe risk of nearly every potential calamity: earthquakes, monsoons, river floods, and tsunamis. Nearly 80% of the population is seriously exposed at any time to large earthquakes. In addition, Tokyo is located on an active fault in the Pacific, making it especially at risk for tsunamis.
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