American researchers claim earthquakes have a bigger impact on health than other natural disasters such as floods and hurricanes. There are more than a million earthquakes around the world annually. As well as the deaths, many people are seriously injured. Millions of people are at risk due to many of the world's major cities location on fault lines, including Los Angeles, Tokyo, New York, Delhi and Shanghai. In the last 10 years, earthquakes have caused more than 780,000 deaths - almost 60 per cent of all disaster-related mortality.
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