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Twitter Authors: Pat Romanski, Hovhannes Avoyan, Jim Kaskade, Bob Gourley, Lori MacVittie

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Woken up by an earthquake

I was visiting Napa Valley over the weekend, and at around 3:30AM on Sunday morning I awoke suddenly to what felt like some giant at the end of the bed shaking it as hard as he could. It was an earthquake. One of the scariest things about an earthquake is that when it happens, you have no idea how serious it is — you only know what it feels like where you are. So of course I turned to Twitter (thank you Twitter!) and the USGS was on the case — it was a 6.1 (later revised to 6.0), with an epicenter about 25 miles away. It was actually a a relief to find out that the epicenter was so close: I was worried that it might have been closer to San Francisco, which would have meant the shaking we felt was indicitive of a much more catastrophic event. Still, it was hard to go back to sleep after it happened, and of course I wasn't the only one. Jawbone, the makers of the Jawbone UP sleep-tracking device, released this chart showing wearers being woken up by the quake and then slowly going back to sleep. Those closer to the epicenter took longer to recover. You can read more about the data collection and analysis behind this chart at the Jawbone blog post linked below. Jawbone blog: How the Napa earthquake affected Bay Area sleepers 

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More Stories By David Smith

David Smith is Vice President of Marketing and Community at Revolution Analytics. He has a long history with the R and statistics communities. After graduating with a degree in Statistics from the University of Adelaide, South Australia, he spent four years researching statistical methodology at Lancaster University in the United Kingdom, where he also developed a number of packages for the S-PLUS statistical modeling environment. He continued his association with S-PLUS at Insightful (now TIBCO Spotfire) overseeing the product management of S-PLUS and other statistical and data mining products.<

David smith is the co-author (with Bill Venables) of the popular tutorial manual, An Introduction to R, and one of the originating developers of the ESS: Emacs Speaks Statistics project. Today, he leads marketing for REvolution R, supports R communities worldwide, and is responsible for the Revolutions blog. Prior to joining Revolution Analytics, he served as vice president of product management at Zynchros, Inc. Follow him on twitter at @RevoDavid