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Research source
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Research source
Seismic activity releases primary (P) waves and secondary (S) waves. The P waves travel much faster (at about the speed of sound) than S waves and seldom cause any damage; hence if one is detected an earthquake is likely in progress. Secondary waves cause most earthquake-related injuries and damage. Using information from multiple sensors and the fact that light travels faster than sound, earthquake early warning systems can provide anywhere from a few nanoseconds to tens of seconds of warning before shaking strikes. This time is enough for automated systems to perform actions that minimize damage and for everyone to prepare for strong shaking.
In California, Oregon, or Japan
Open Settings iPhone Settings App Icon. This app has a settings gear on a gray background.
Choose Notifications. This is the first item in the second section.
Scroll down to the bottom. Look for the section called "Government Alerts".
Toggle "Emergency Alerts" and/or "Public Safety Alerts" to iPhone Switch On Icon. This will enable all emergency alerts, including earthquake and tsunami alerts. You will receive notice of earthquakes with a magnitude 5.0 or higher and seismic intensity 4 (on Mercalli scale in California) or 5-/5 lower (on Shindo scale in Japan).
With an iPhone App
Open the App Store iPhone App Store Icon. This app has an A on a blue background.
Tap on the search button in the corner. This will open up the search page.
Type "MyShake" into the search box. Then click on Search.
Tap on GET. This will download the MyShake app to your iPhone.
Open the app. This app has a network of circles connected with lines.
Accept the licensing agreement. In order for you to use the app to view or receive earthquake alerts, you must accept the licensing agreement.
Enable notifications and location services. This is required in order for the app to function. Without it, you will not receive alerts when strong tremors are imminent.
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