- Google's system uses Android's accelerometers as a detection network.
- It is activated from Security and Emergency in the settings.
- iPhones don't have this feature natively, but there are alternative apps.
- The alerts warn seconds before, but they do not predict earthquakes.
Earthquakes are phenomena that can cause great alarm, and having a few seconds' head start can make all the difference . Smartphones have become essential tools for receiving alerts before the strongest seismic waves reach our area. Google's earthquake alert system is one of the best-known tools, but not everyone knows how it works or how to activate it.
In this article, we'll tell you everything you need to know about this feature , from how it works to how to set it up on your Android device, and what options are available to iPhone users, who don't have this feature natively. We'll also look at the limitations and key recommendations for being prepared in the event of an earthquake.
How does Google's earthquake alert system work?
Google's system leverages the accelerometers built into millions of Android phones to create a global detection network. When multiple devices detect movements consistent with an earthquake, they send anonymous data along with their approximate location to Google's servers. There, an algorithm processes the information and, if it confirms that it is an earthquake, sends an alert to potentially affected users.
According to official documentation, alerts are issued for earthquakes of magnitude 4,5 or higher. The warning time varies: in some cases, it can be a few seconds before the strong shaking arrives, but if you are very close to the epicenter, the notification may arrive after it has already begun. This technology does not predict earthquakes, but rather detects the primary waves and warns before the secondary waves.
How to activate alerts on your Android
Activation is very simple, although it may vary slightly depending on the brand and system version. In most cases, you need to go to Settings, then to Security and Emergency , and look for the "Earthquake alerts" section. If it's not there, it may also be under "Location" > "Advanced." Once there, simply activate the earthquake alert on your Android device using the switch.
It's essential to have location services enabled and an internet connection, either via Wi-Fi or mobile data. Without these permissions, the system won't know who to notify. Some manufacturers include this by default, but it's always a good idea to verify that it's enabled.
And what about iPhone users?
Here's the bad news: iPhones don't have a seismic alert system like Google's. Apple's feature, called "Enhanced Safety Alerts," is only available in the United States and Taiwan, and requires iOS 26.2 or later. In other countries, such as those in Europe or Latin America, this option doesn't appear in the settings.
That doesn't mean you won't receive alerts. iPhones can display government and emergency alerts sent by local authorities through mobile carriers. These are usually enabled by default, but it's worth checking in Settings > Notifications > Government Alerts. However, these alerts depend on each country's infrastructure and are not specific to earthquakes.
Alternative apps for iPhone
To address this lack of information, several specialized earthquake tracking apps exist. One of the most popular is Earthquake Network , also known as Earthquake Detector, which uses a network of sensors and user reports to send real-time alerts. Another option is My Earthquake Alerts & Feed , which offers interactive maps, notifications, and data such as depth and distance.
You can also use AccuWeather , although its primary focus is weather, it includes alerts for natural disasters. It's important to remember that these apps don't guarantee early warning, and some only report after the earthquake. To maximize their effectiveness, you should allow notifications, location access, and, if possible, activate "Critical Alerts" if the app allows it.
Limitations and safety advice
No alert system is perfect. Google warns that not all earthquakes are detected and that notifications may arrive before, during, or after the shaking. Nor do they replace official emergency protocols. Therefore, it is essential to have an action plan: locate emergency exits, secure heavy furniture, and prepare a kit with water, food, and a first-aid kit.
The Red Cross recommends identifying safe zones and practicing drills with your family. It's also helpful to have the Google app properly configured, but don't rely solely on it. Prevention and calm are the best tools.
Having a mobile phone with earthquake alerts can make a difference, but it's not the only thing. The combination of technology, preparedness, and common sense is what truly keeps us safe. Understanding how Google's system works, activating it correctly, and knowing what alternatives exist for iPhones are basic steps to be ready for any eventuality.
