On the 30th anniversary of the deadly Loma Prieta earthquake, the Governor, thee Directors of the California Governor’s Office of Emergency Services (Cal OES), UC Berkeley, United States Geological Survey (USGS), Senator Jerry Hill and others will announce the launch of the nation’s first statewide Earthquake Early Warning System.
The California Earthquake Early Warning System will marry a new smartphone application with traditional alert and warning delivery methods such as Wireless Emergency Alerts (WEA). The system uses ground motion sensors from across the state to detect earthquakes before humans can feel them and will notify Californians so that they can “Drop, cover and hold on” in advance of an earthquake.
For more information please visit earthquake.ca.gov.
Earthquake Early Warning (EEW) systems use science, state-of-the-art monitoring technology, and innovative delivery methods to alert people via devices before the anticipated strongest shaking arrives in affected regions. Seconds to tens of seconds of alert can provide opportunity to take life-saving actions such as Drop, Cover, and Hold On and put devices into various forms of a safe mode.Individuals or businesses receiving an alert will vary depending on the distance they are from the epicenter of the earthquake. The closer you and individual or entity, the shorter the alert time; the further they are, the longer the alert time they will receive.
1. In an earthquake, a rupturing fault sends out three different types of waves. The fast-moving P-wave is first to arrive, but the damage is caused by the slower S-waves and surface waves.2. Sensors detect the P-wave and immediately transmit data to an earthquake alert center where the location and size of the quake are determined and updated as more data becomes available.3. A message from the alert center is immediately transmitted to users.
The earthquake early warning system in California will be able to provide seconds to tens of seconds of alert prior to strong shaking. People may receive a ShakeAlert before, during, or after shaking arrives at their locations. The length of time warning given to any location, before, or after shaking begins depends on a number of factors, including: