Earthquake Alerts: Early and Often? Or Possibly Late?

chart with 2 maps of SF Bay Area, illustrating quake warning possibilities

Detailed Description

The choice when issuing earthquake warnings is to: 1) issue alerts for weak shaking and potentially provide long warning times, but risk sending alerts for the many events that do not go on to produce damaging ground shaking, or 2) issue alerts only when ground shaking is expected to be damaging, with the tradeoff that the alert will be sent much later.


Image Dimensions: 5945 x 5350

Date Taken:

Location Taken: San Francisco Bay Area, CA, US


Sarah Minson, U.S. Geological Survey