Today's Map

What Is This Map?

How Do We Make This Map?

What Are Aftershocks, Foreshocks and Earthquake Clusters?

How Can I Use This?

Map Archive

These maps are made with contributions from ETH-Zurich, Switzerland, and the Southern California Earthquake Center


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24-Hour Aftershock Forecast Map

California Index Map

Click on the map to zoom in.

This is a time-dependent map giving the probability of strong shaking at any location in California within the next 24-hours. For this purpose, “strong shaking” is defined as Modified Mercalli Intensity (MMI) VI, or the level of shaking that throws objects off shelves.