13.53% probability that no earthquakes with a magnitude of 6.5 or greater strike the San Francisco Bay Area in the next 40 years.
How is the magnitude of the earthquake measured?
One magnitude unit describes an earthquake. The location of the measurement has no bearing on the magnitude. The Moment Magnitude Scale has been used to identify earthquakes all around the world since 1970.
The Moment Magnitude Scale was created to measure all types of seismic waves, including those from global seismic networks and earthquakes.
The severity of an earthquake's impacts on the surface of the Earth, people, and structures at various places around the epicenter are described by seismic intensity scales. There are several ways to quantify intensity. The Modified Mercalli Scale counts the number of shakes per unit area.
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