Hayward Fault's 'tectonic time bomb'
Studying layers of soil in a trench they dug near the Fremont BART station, geologists recently made a startling discovery: The Hayward Fault has had a big earthquake roughly every 140 years, on average, since 1315. And this Sunday marks year 139.
http://www.siliconvalley.com/news/ci_7211083
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