Download the ShakeAlertLA Early Earthquake Warning App

Description

ShakeAlertLA sends alerts to users within Los Angeles County that an earthquake of greater than magnitude 5.0 or level IV intensity has been detected and that they may soon feel shaking. The app is available for both Apple and Android devices and available in both English and Spanish. You can also use this app to prepare for an earthquake, get details on recent earthquakes, and find help after an earthquake. This app is brought to you by Mayor Eric Garcetti and the City of Los Angeles, and built on the ShakeAlert system developed by the U.S. Geological Survey.

Get it On Google Play     Download on the App Store

Collaborative Partnership

The ShakeAlertLA App is brought to you by the Office of Los Angeles Mayor Eric Garcetti, the Information Technology Agency and the Department of Emergency Management. It has been made possible by support from the Annenberg Foundation and the Mayor’s Fund for Los Angeles. This App is an official pilot in partnership with the U.S. Geological Survey.

Frequently Asked Questions

When an earthquake happens, a rupturing fault sends out different types of waves. The first wave felt is the fast-moving P-wave. The slower-moving S-waves arrive later causing the most damage. 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 become available. A message from the alert center is immediately transmitted to your computer or mobile phone with data on the expected intensity and arrival time of shaking at your location. https://www.shakealert.org/

To receive notifications of earthquakes, you must have Location Services “Always On”. As a result, ShakeAlertLA keeps track of the last location of your phone to push out an alert as needed with the expected shaking at that location. When the location is updated, previous information is overwritten. No other information is collected or accessed.

  1. Is ShakeAlertLA predicting an earthquake?
    • No, if you receive an alert it’s because an earthquake has already started. ShakeAlertLA gets notifications from the U.S. Geological Survey’s ShakeAlert detectors. These detectors are placed in the ground along the West Coast of the United States and detect when ground shaking occurs. An alert is then sent that an earthquake has started.
  2. How does this actually work?
    • When an earthquake happens, a rupturing fault sends out different types of waves. The first wave felt is the fast-moving P-wave. The slower-moving S-waves arrive later causing the most damage. 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 become available. A message from the alert center is immediately transmitted to your computer or mobile phone with data on the expected intensity and arrival time of shaking at your location. https://www.shakealert.org/
  3. What information is being collected from phones with ShakeAlertLA installed?
    • To receive notifications of earthquakes, you must have Location Services “Always On”. As a result, ShakeAlertLA keeps track of the last location of your phone to push out an alert as needed with the expected shaking at that location. When the location is updated, previous information is overwritten. No other information is collected or accessed.