There’s a 62 percent chance of an earthquake in the San Francisco Bay Area in the next 30 years, according to the U.S. Geological Service. But no one knows when or where the next big one might be. So, when I heard of startup offering an early-warning service for earthquakes, I wanted to learn more.It’s a tough problem to solve. Thousands of widely dispersed sensors are needed, as an earthquake could originate anywhere. To be effective, an early-warning service also needs a dependable communication network and fast analysis. Take a look at what happened when the last "big one" struck the San Francisco Bay Area.To read this article in full or to leave a comment, please click here