Core Points - A 4.5 magnitude earthquake occurred in the Taiwan Strait at 6:56 AM on September 20, 2025, waking many people from their sleep [1][6][66] - The earthquake triggered a strong response on social media, with many users expressing their feelings and experiences [6][66] - The "China Earthquake Network" app sent out early warning notifications to 207,696 users in the vicinity of the epicenter [9][10] Group 1 - The earthquake's epicenter was located 76 kilometers from the nearest populated area, with a reported intensity of 3 degrees [10] - The earthquake was initially reported as 4.7 magnitude, later updated to 5.0 and finally to 5.1 magnitude [10] - Users received alerts through the "China Earthquake Network" WeChat mini-program, which is a collaboration between the China Earthquake Network Center, national emergency broadcasting, and Tencent [9][10] Group 2 - The article provides instructions on how to set up earthquake alerts on various smartphone brands, including Huawei, Xiaomi, and Apple [11][12][16] - Users can enable notifications for earthquake warnings through the WeChat mini-program by allowing location access and notifications [17][31] - The article emphasizes the importance of being prepared and knowing how to respond during an earthquake, including recommended actions based on the warning time [39][45][56]