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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.

Version 1.1 adds a new feature based on feedback from the ShakeAlertLA community. The "Recent earthquakes" screen now displays earthquakes of magnitude 3.0 and above in the past 30 days for the continental United States.

More information and a tutorial is at https://earthquake.lacity.org/shakealertla.

What’s New

Version 1.3

This version allows notifications to be sent to ShakeAlertLA users in Los Angeles County who could potentially experience weak shaking or greater from earthquakes of magnitude 4.5 or greater within Los Angeles County. This has been lowered from the previous setting of magnitude. The time shown for earthquakes has been changed from Universal Time Coordinated (UTC) to show Pacific Standard/Daylight Time (PST/PDT). This update also provides interruption (do not disturb) setting options to allow users to choose to be notified of an event even when on silent mode. An explanation is also provided on how the location data is being used, and adds a link to a demo of what an alert will look and sound like.

Ratings and Reviews

2.0 out of 5
1.5K Ratings

1.5K Ratings

CoolRegman ,

Great idea, poor execution

As a LA resident, this could be a must-have app. Sadly, it seems designed by individuals with no experience in even basic app design, or they do not do even the most basic beta testing, rendering it worse than useless because it just doesn’t provide alerts. After the recent set of earthquakes (where no one received alerts on the app), they revised the app. Still wont work:
* If you click “provide feedback” in the support section of the app, it takes you to a USGS site that has interesting information but absolutely no place for feedback. This is a real gap in enabling feedback. The app needs to provide proper contact information.
* If you travel, the app follows your location and only provides earthquake information for where you are physically located at that moment. We want to know information about where we live in SoCal all the time. Instead, we receive information about San Francisco, Washington DC, Dallas, Chicago, London, or wherever we are traveling. This makes the app useless. The app needs to be able to have a “home” setting.

The solutions to both of these are very easy fixes, and would greatly improve the app’s utility.

Rt. Rev. Jeffster ,

A solid start

The first release is a beta version. Not bad.
The only way to fully debug a real-time distributed system is to deploy it, and see how it works at large scale. There are millions of phones in LA County - there are bound to be snags, but they can’t be found until it’s tried.

I’ve read other reviewers’ complaints:

- it only works in LA County
That’s where the sensors are, kids.
Other local governments need to get with the program.

- it tracks your location, and reports locally
Makes sense. I want to know if *I* am going to feel an earthquake, where I am, right now. If I’m in Portland, and there’s an earthquake in LA, I’ll get the news, soon enough.
LA sending notifications around the world is an unreasonable demand.

My questions:
- does it have anti-spoofing safeguards?
If an alarm goes out, people are going to go completely ape. If it’s a false alarm, injuries may happen for no good reason.
- will it override the audio on/off switch, just in case?
I bump my switch all the time.
- will it sound the alarm at max volume, no matter the present setting?
A good warning system should wake the dead.

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
44.2 MB

Requires iOS 12.0 or later. Compatible with iPhone, iPad, and iPod touch.


English, Spanish

Age Rating
This app may use your location even when it isn't open, which can decrease battery life.


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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