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ShakeAlertLA alerts you that an earthquake has been detected and that you may soon feel shaking. 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.

Ratings and Reviews

2.6 out of 5
493 Ratings
493 Ratings
DoingTheShimmy ,

Not ready for prime time (yet)

Looks like the timing of this release was intended to coincide with the 25th anniversary of the Northridge Earthquake. Any potential political points have been lost with this rushed release. Great idea, but this app is not ready to go live yet. Looks like the developer needed more time to get key functions in place. Yes, I realize it only alerts for 5.0 or great. Yes, it’s only for LA County. There is no way to know or test to see that it works and is set correctly. Just hope it will send an alert when you really need it. I open the map, and it shows me Europe (with not a single earthquake identified anywhere on Earth). Why show me Europe if it only covers LA County? Under “Find a shelter” (you will want this info after your house has been destroyed), there is no list of nearby shelters. It would help to have an FAQ and a link to provide feedback to the developer. Hopefully, newer versions will come out soon that will make this app useful. For now, it’s more like an empty template that still needs to be filled in. Looking forward to newer versions.

Gnorizo ,

App crashes: detailed explanation and bug report is attached

The app crashes on two of our phones and runs correctly on a third phone. A bug in the app appears to assume the phone is located in California and crashes if it’s not.

This bug is repeatable, and we did the following tests:

1. Install app on phone in Utah and enable location services: crashes.

2. After step 1, disable location services from Settings and re-launch app: doesn’t crash.

3. Install app on phone in Utah and disable location services: doesn’t crash.

4. After step 3, enable location services from Settings and re-launch app: crashes.

5. Try to fix crashing by rebooting phone, or re-installing app: crashes.

6. Install app on phone in Los Angeles and enable location services: doesn’t crash.

7. Install app on phone in Los Angeles and disable location services: doesn’t crash.

The tests were performed using identically configured iPhone X devices running the latest iOS but located in different states.

This bug is potentially dangerous because if the app crashes while a phone is temporarily outside of California, the app might remain crashed even after the phone is back in California and therefore will not receive alerts.

It should be extremely easy to reproduce and fix this bug. My hope is that one of the developers sees this bug report and is able to correct the issue. Thank you.

Developer Response ,

Thank you Gnorizo for your thoughtful and detailed reply. It helped us identify the problem, and get it resolved behind the scenes without requiring a new version of the app to be installed. The issue affected people who were outside of Los Angeles County and had downloaded the app. The app should now be working for everyone. I appreciate you taking the time to document this. Let me know if you have any further issues.

MonstrCoco ,

Not sure why people being so negative

This app is a great idea and I am glad to see it finally get released. I haven’t experienced any problems or crashing and it’s brand new so nobody can say much about its efficacy yet but I hope it succeeds one day to do what it was created to do; save lives.

Los Angeles is the first city to have an earthquake early warning tool like this one. We all know there will be earthquakes in this city, maybe not today, but it will happen. There’s no good reason not to be as prepared as you can and this app is a good place to start. This app includes a few simple tools for earthquake preparation like checklists and helpful instructions about what to do during and after an earthquake.

Developer Response ,

MonstrCoco, thanks so much for helping to clarify the idea behind the app. It's great to have folks really see the possibility in how an earthquake early warning can make a difference.


City of Los Angeles
49 MB
Requires iOS 11.0 or later. Compatible with iPhone, iPad, and iPod touch.
English, Spanish
Age Rating
Rated 4+
© c. 2019


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