Few things are more alarming than realizing your iPhone did not sound the emergency earthquake alert when it should have. On the other hand, some people — medical staff, night-shift workers, or parents of light sleepers — need to understand exactly when and how to temporarily silence the alert, or how to make sure it does not get blocked by Focus modes or silent switch settings. This guide covers everything related to iPhone earthquake alert settings: how the system works, which settings control it, why alerts sometimes fail to arrive, step-by-step troubleshooting for silent alerts, how to safely turn alerts off and back on, how to test your setup using official drill notifications, how tsunami and national protection alerts differ, and how Apple Watch ties into the picture. Whether your goal is to make sure the alert always reaches you, or to understand the trade-offs of turning it off temporarily, you will find a clear and complete answer here.
Table of Contents
- How iPhone Earthquake Alerts Work
- Checking Your iPhone Alert Settings
- Why Your iPhone Earthquake Alert May Not Be Sounding
- Testing Your Setup with Official Drill Notifications
- How to Turn Off Earthquake Alerts and What to Know First
- Earthquake Alerts vs. Tsunami Warnings vs. National Protection Alerts
- Apple Watch and Earthquake Alerts
- Frequently Asked Questions
- Summary
How iPhone Earthquake Alerts Work
The Science Behind the Early Warning System
Japan's earthquake early warning system is operated by the Japan Meteorological Agency (JMA). A nationwide network of seismographs detects the first small tremors of an earthquake — called P-waves — and uses that data to predict the magnitude and location of the larger shaking (S-waves) that follows.
Because P-waves travel faster than S-waves, there is a brief window of a few seconds to tens of seconds between the first detectable tremors and the destructive shaking. The early warning system uses that window to push an alert before the strong shaking arrives. The closer you are to the epicenter, the shorter this lead time becomes, and at the epicenter itself the P-wave and S-wave arrive nearly simultaneously, leaving no time to warn.
How Alerts Reach Your iPhone (Wireless Emergency Alerts)
In Japan, earthquake early warnings are delivered through a system called Wireless Emergency Alerts (WEA). Unlike ordinary push notifications from apps, WEA messages travel over a dedicated broadcast channel built into the cellular network. Your carrier broadcasts the alert to every compatible device within a coverage area simultaneously, without needing your phone number or any account information. This is why no app installation or registration is required to receive earthquake alerts.
For the system to work, the following conditions must be met:
- You are using a SIM from a Japanese carrier (NTT Docomo, au, SoftBank, Rakuten Mobile, or compatible MVNO)
- The Emergency Alerts setting on your iPhone is turned on
- Airplane mode is off
- You are within a carrier coverage area
International SIM cards and certain MVNO plans may not support WEA delivery. Details on carrier compatibility are covered in the troubleshooting section below.
Checking Your iPhone Alert Settings
How to Open the Emergency Alerts Settings Screen
- Open the Settings app.
- Tap Notifications.
- Scroll to the very bottom of the screen and tap Emergency Alerts.
This screen is where you control all emergency notification types, including earthquake alerts, tsunami warnings, and national protection alerts.
What Each Setting Does
| Setting | Description |
|---|---|
| Emergency Alerts (master switch) | Turns the entire Emergency Alerts section on or off |
| Earthquake, Tsunami, and Other Alerts | Enables JMA earthquake early warnings |
| Tsunami Warnings | Enables tsunami warning notifications |
| National Emergency Alerts | Enables alerts for missile launches and major national emergencies (J-Alert) |
| Alert History | Shows previously received emergency alerts (availability varies by iOS version) |
To receive earthquake alerts, make sure the toggle next to Earthquake, Tsunami, and Other Alerts (or the equivalent label on your iOS version) is switched on and showing green. On some iOS versions this appears as a single combined toggle rather than separate items.
Why Your iPhone Earthquake Alert May Not Be Sounding
If your settings appear correct but an alert did not come through, work through the following checks in order.
The Alert Toggle Is Turned Off
Start here. Go to Settings > Notifications > Emergency Alerts and confirm that the earthquake alert toggle is on (green). It is surprisingly easy to accidentally switch this off when scrolling through the Notifications settings, and it is the most common reason people miss alerts.
Does Silent Mode Affect Earthquake Alerts?
The physical Ring/Silent switch on the side of your iPhone does not silence earthquake alerts. Even when your iPhone is in silent mode, emergency alerts play at near-maximum volume. This is a deliberate design choice rooted in public safety requirements.
There is one exception: if you have manually lowered the ringer volume to zero using the volume buttons (separate from the silent switch), the alert may play at a very low volume or be inaudible. If you rely on the silent switch for meetings or sleep, that is safe — but make sure your actual volume level is not set to zero.
A Focus Mode Is Blocking the Alert
iOS 15 introduced Focus modes (Do Not Disturb, Sleep, Work, Personal, and so on) that filter which notifications reach you. Depending on how a Focus mode is configured, it may block emergency alerts.
To check:
- Go to Settings > Focus.
- Tap whichever Focus mode is currently active or frequently used.
- Look for an option labeled Allow Time-Sensitive Notifications or Emergency Alerts near the bottom of the settings.
- Make sure that option is enabled.
Some iOS versions show a dedicated toggle for emergency alerts within Focus settings. Enable it to ensure alerts pass through even when the Focus mode is active.
Airplane Mode Is Enabled
Airplane mode stops all wireless communication, including the cellular broadcast channel used for WEA alerts. If your iPhone is in airplane mode during an earthquake, you will not receive the alert. Open Control Center (swipe down from the top-right corner) and check whether the airplane icon is highlighted. Tap it to turn airplane mode off if it is on.
Low Power Mode and Alert Reception
Low Power Mode itself does not disable earthquake alert reception. However, because Low Power Mode restricts background activity and some radio functions, there are occasional reports of alerts arriving with a slight delay. If you are in an area with elevated seismic risk, keeping your battery charged and Low Power Mode off where practical gives you the best chance of receiving alerts promptly.
Carrier Compatibility (International SIM and MVNOs)
If you are using a SIM from an overseas carrier while in Japan, that SIM may not support WEA delivery on Japanese networks. Earthquake alerts will not come through in this case.
Most Japanese MVNOs (budget carriers) lease their network infrastructure from the major carriers — Docomo, au, or SoftBank — and therefore support WEA delivery just as the major carriers do. However, some data-only plans, eSIM-only plans, or plans with unusual technical configurations may not. Check your MVNO's support documentation or contact their customer service to confirm.
Testing Your Setup with Official Drill Notifications
The most reliable way to confirm your iPhone will receive earthquake alerts is to participate in an official drill. Japan's J-Alert system (the nationwide instant warning system) conducts periodic nationwide and regional drills, usually announced in advance on the Cabinet Secretariat and JMA websites. During a drill, a test notification is broadcast through the same WEA channel as a real alert, using the same loud alarm tone.
The test notification displays a message clearly stating it is a drill, so there is no risk of confusing it with an actual earthquake warning. When a drill date is announced in your area, simply have your iPhone on and unlocked — or locked but not in airplane mode — and verify the alert arrives.
There is no way to trigger a test alert on demand from within iOS settings. Apple does not provide an individual test function for emergency alerts. Official drills are the only sanctioned method for checking that your device receives them correctly. Keep an eye on JMA and local government websites for upcoming drill schedules.
How to Turn Off Earthquake Alerts and What to Know First
Steps to Disable the Alert
- Open Settings.
- Tap Notifications.
- Scroll to the bottom and tap Emergency Alerts.
- Switch the earthquake alert toggle to off (gray).
To re-enable it, follow the same steps and switch the toggle back to on (green).
What You Give Up When the Alert Is Off
Turning off earthquake alerts means you will not receive the few seconds of advance warning before strong shaking arrives. Those seconds can be enough to get under a desk, move away from a window, or turn off a gas stove — actions that meaningfully reduce the risk of injury. The alert is designed to reach you even in silent mode for exactly this reason.
If the alert sound is disruptive at night or in specific environments, consider these alternatives before disabling it entirely:
- Place your iPhone further from your bed so the sound wakes you without being right next to your ear
- Use a Focus mode (Sleep or Do Not Disturb) configured to allow emergency alerts — this silences regular notifications while keeping the earthquake alert active
- Check your iPhone volume level — the alert will still play, but at the system volume level (not bypassing it to maximum unless you are on a Japanese carrier version of iOS)
Turning off earthquake alerts is best reserved for situations with a specific medical or technical reason. If you do disable it temporarily — for example during a hospital stay where electronic alarms must be silent — set a reminder to turn it back on as soon as the situation allows. For related safety settings, see the guide on iPhone Emergency SOS settings.
Earthquake Alerts vs. Tsunami Warnings vs. National Protection Alerts
The Emergency Alerts settings screen on your iPhone has three separate toggles, each covering a different type of emergency. Understanding the difference helps you make an informed choice about which ones to keep enabled.
Earthquake, Tsunami, and Other Alerts
Issued by the Japan Meteorological Agency. Sent to areas where seismic intensity of 5-lower or above is predicted. This is the classic earthquake early warning — the alert arrives before the strong shaking, giving you a brief window to protect yourself.
Tsunami Warnings
Also issued by the JMA. Sent after an earthquake when a tsunami is expected to reach coastal areas. This is a consequence alert rather than a pre-event warning. Tsunami advisories (the lower-level caution) are not sent via WEA and must be checked through news apps or the JMA website.
National Emergency Alerts
Issued by the Cabinet Secretariat. Used for ballistic missile launches, large-scale terrorist events, or other national protection situations. These are the alerts associated with the J-Alert system. They use the same alarm tone as earthquake alerts but carry different content.
All three types are controlled by independent toggles. Unless you have a specific reason to disable one of them, keeping all three on is strongly recommended.
Apple Watch and Earthquake Alerts
An Apple Watch paired with your iPhone will mirror emergency alert notifications from the phone.
Requirements for receiving alerts on Apple Watch
- The Apple Watch must be paired and connected to your iPhone via Bluetooth or a shared Wi-Fi network
- The Watch should be worn or nearby so haptic feedback and sound can notify you
The haptic tap on your wrist can be particularly useful at night. If your iPhone is on the other side of the room but you sleep with your Apple Watch on, the Watch can alert you even when you might not immediately hear the iPhone. This is a meaningful backup layer for people who sleep in large rooms or who sometimes keep their iPhone charging away from the bed.
Important limitations
Apple Watch does not receive WEA alerts independently. It only mirrors what the paired iPhone receives. If your iPhone is in airplane mode, turned off, or out of range of the Watch, the Watch will not receive the alert either. Cellular Apple Watch models have their own SIM capability for calls and data, but emergency alert reception still depends on the paired iPhone receiving the alert first.
Also check your Apple Watch Focus or Do Not Disturb settings. If the Watch is set to a Focus mode that silences notifications, the mirrored earthquake alert may be suppressed on the Watch side even if it arrives on the iPhone. Go to Settings > Focus on your iPhone and review the Watch notification behavior for each Focus mode you use.
Frequently Asked Questions
Q. Will earthquake alerts sound even when my iPhone is in silent mode?
A. Yes. The ring/silent switch on the side of your iPhone has no effect on earthquake alerts. The alert plays at near-maximum volume regardless of silent mode status. This behavior is mandated by public safety regulations in Japan. The only case where the alert might be inaudible is if your system volume was manually set to zero using the volume buttons separately from the silent switch.
Q. Can I receive earthquake alerts with a budget carrier (MVNO) SIM?
A. Most MVNO SIMs in Japan support earthquake alerts because they use the same network infrastructure as major carriers (Docomo, au, or SoftBank). However, some data-only plans or specialized eSIM configurations may not. Check your MVNO's website or contact their support team to confirm whether WEA alerts are supported on your specific plan.
Q. Will I receive Japanese earthquake alerts while traveling abroad?
A. No. Japanese earthquake alerts use the Japanese carriers' cellular network. If you are abroad and not on a Japanese carrier's signal, the alerts will not reach your iPhone. You may receive the local country's emergency alerts through whatever local carrier your roaming SIM connects to, but that is a separate system.
Q. Can I adjust the volume of earthquake alerts independently?
A. Standard iOS does not allow you to set a separate volume level for emergency alerts. On devices running iOS with Japanese carrier settings, the alert is designed to override the silent switch and play loudly. If you need to manage the sound, your options are to turn the alert off entirely (not recommended) or use a Focus mode that allows emergency alerts while blocking other sounds.
Q. Do earthquake alert settings work the same on older iPhones?
A. The core path — Settings > Notifications > Emergency Alerts — has been consistent since iOS 13. The Focus mode settings described in the troubleshooting section require iOS 15 or later. On iOS 14 and earlier, check Settings > Notifications > Emergency Alerts and also verify that Do Not Disturb is not set to block all alerts. The fundamental behavior (alerts bypass silent mode) applies across all supported iOS versions.
Summary
When an iPhone earthquake alert goes silent, the cause is almost always one of three things: the toggle in Settings has been switched off, a Focus mode is blocking the alert, or airplane mode is enabled. Start by checking Settings > Notifications > Emergency Alerts to confirm the toggle is on, then review any active Focus modes to make sure emergency alerts are permitted.
If you need to turn the alert off temporarily for a specific situation, do so through the same settings screen — but set a reminder to turn it back on immediately afterward. Those few seconds of advance warning can make a meaningful difference in your ability to protect yourself and the people around you.
For Apple Watch users, verify that the Watch is paired and connected, and review Focus mode settings on the Watch side as well. A properly configured Watch adds a useful backup layer of notification when your iPhone is not within earshot.
