The maps described and shown on the following pages are the result of this research and better understanding. They are an updated version of the maps documented in the 1987 On Shaky Ground report. This report documents ABAG's shaking hazard maps to encourage appropriate planning for and mitigation of earthquake hazards. But in ALL earthquakes, the ground shakes . In large magnitude earthquakes, more ground shakes, and it shakes longer, than in small magnitude earthquakes.
Ground shaking causes damage tens of miles away from the fault source.
When the ground shakes, damage occurs to buildings, facilities and their contents. People can be injured or killed. People find that they may no longer be able to sleep in their homes, or even have access to their belongings. Businesses can't function and segments of the economy suffer. Hazardous materials are released which can be damaging to people and the environment.