Tectonix Support
Need help? Email theomirzakhanian@gmail.com. Include your iPhone model, iOS version, and the app version (shown at the bottom of Settings).
What Tectonix does
Tectonix shows the chance of a magnitude 4 or larger earthquake in California, including its coastal waters, over the next 7 days. The forecast is updated once a day. The app also shows recent USGS earthquakes in and near California and a preparedness checklist. It gives probabilities over areas and 7-day windows, like a flood map, not exact times or places.
Is this an earthquake warning app?
No. Tectonix cannot warn you that shaking is about to start. For official alerts, use USGS ShakeAlert (Wireless Emergency Alerts, MyShake) and follow local emergency officials.
What do normal, elevated, and high mean?
Statewide: this week's chance compared with a typical week. About 37% of weeks have an M4+ in California. Elevated starts at 1.5 times a typical week, high at twice.
Your area: the chance of an M4+ within 30 km of you this week, rated on the same fixed levels everywhere in California: elevated from 3%, high from 10%.
Why are the percentages so small?
Any single place has a low chance of a magnitude 4+ earthquake in a given week. In an ordinary week most places in California are under 1%.
Location
Location is optional and is used only on your device to show the chance near you and distances to earthquakes. My Area covers California; elsewhere it shows “Outside coverage”. To change access, open Settings in the app and tap Location, or go to iOS Settings › Tectonix › Location.
Notifications
Turn on Nearby earthquakes in the app's Settings to get a notification for new M4+ earthquakes within 100 km of you (or anywhere in California, including its coastal waters, if location is off). The app checks when you open it or bring it back to the foreground, not in the background.
The forecast didn't update
The forecast is updated once a day. Without a connection, the app shows the last forecast it downloaded, or the one built into the app, with its date. Check your connection and reopen the app.
Resetting the app
All your settings, checklist progress, and household details are stored only on your device. Deleting and reinstalling the app resets everything.
Privacy
No accounts, no analytics, no tracking. Read the full Privacy Policy.