How does Apple turn on the earthquake warning mode?

The steps for Apple to turn on the earthquake warning mode are as follows:

Tools/materials: iPhone 13pro, iOS 15.5.0, earthquake warning app2022. 1. 1.

1. After installing the earthquake warning app on Apple's mobile phone, click Open. Or open the phone "Settings".

2. After entering the home page of earthquake warning, click Settings in the lower right corner. Or enter the "Emergency Warning Notification" option.

3. Open the mobile phone authorization settings and the attention area settings in the settings.

4. Click on the authorization to open all permissions in the authorization settings, including notifications.

5. Choose to add your current city in the area of concern, so that when the local earthquake wave is predicted, it will be warned by mobile phone.