Map of Modified Mercalli Intensity (MMI) VI Forecast

Modified Mercalli Intensity (MMI) VI, is the level of shaking that throws objects off shelves. ETH-Zurich, Switzerland, and the Southern California Earthquake Center have contributed to an online map that shows the odds of a significant earthquake on any given day in California. Real-time Forecast of Earthquake Hazard in the Next 24 Hours can’t tell you if a Big One is imminent, researchers said. But when a sizable quake does strike, it’s almost certain to trigger aftershocks.