Earthquake warning 4+

Earthquake Disaster Warning App - Let the warning notify you in a timely manner!
【 Technical Principles 】
The earthquake warning system utilizes the difference in propagation speed between longitudinal waves (P-waves) and transverse waves (S-waves) of earthquakes. P-waves have a fast propagation speed but low destructive power, while S-waves have a slow propagation speed but high destructive power.
The system captures P-waves through monitoring instruments, quickly estimates seismic parameters, and issues warnings before S-waves arrive.
[System Composition]
A dense seismic observation network used to capture seismic wave signals.
An intelligent processing system that quickly analyzes earthquake parameters and issues warnings.
[Warning Release]
Warning information is released through electronic communication systems such as radio, television, internet, mobile phones, etc.
Although the warning time is short, it can effectively reduce casualties and economic losses.
[Warning significance]
When the warning time is 3 seconds, it can reduce casualties by 14%; When the warning time is 10 seconds, it can reduce 39% of casualties.
The earthquake warning system can also be used for emergency response of major projects such as high-speed railways and nuclear power plants to prevent the occurrence of secondary disasters.
[Subscription Service]
1. Subscription service: providing continuous weekly, monthly, quarterly, and annual subscription services;
2. Subscription price: 18 yuan/week for continuous weekly products, 38 yuan/month for continuous monthly products, 88 yuan/month for continuous seasonal products, and 1988 yuan/year for continuous annual products;
3. Payment: After the user confirms the purchase and makes the payment, it will be credited to their iTunes account. The Apple iTunes account will be charged within 24 hours before expiration, and after successful deduction, the subscription period will be extended by one subscription period;
4. Cancel Renewal: To cancel the subscription, please open "Settings" on your iPhone ->go to "iTunes Store and App Store" ->click on "Apple ID" ->select "View Apple ID" ->go to the "Account Settings" page ->click on "Subscription" ->select "Earthquake Disaster Warning" to cancel the subscription. If the subscription is not closed at least 24 hours before the end of the subscription period, the subscription will be automatically renewed;
User Agreement: https://docs.qq.com/doc/DRmNvbVFaZm9LVG9t
Privacy Policy: https://docs.qq.com/doc/DRmNUSHBNQ291blRQ
Subscription Agreement: https://docs.qq.com/doc/DRmx1SmpBb1BHbFZp