Core Insights - The majority of smartphones sold in China are equipped with earthquake early warning features, which have gained attention following recent seismic events [1][3] Group 1: Earthquake Early Warning Features - Most smartphones in China have built-in earthquake early warning functions, with Android devices providing full-screen alerts and vibrations even in lock screen mode [1] - The earthquake warning system is primarily provided through collaboration between third-party monitoring agencies and smartphone manufacturers [3] - Apple devices require third-party apps or mini-programs to access earthquake warning features, necessitating user setup for location and notifications [4] Group 2: User Engagement and Response - During the recent earthquake in Guangzhou, approximately 502,000 WeChat users received alerts from the "China Earthquake Early Warning" mini-program about 10 seconds before the tremors reached them [4] - The early warning system can provide alerts seconds to minutes before the earthquake hits, allowing users to take precautionary measures [4] Group 3: Safety Recommendations - Recommendations for public safety include taking cover near sturdy objects for alerts received within 3 seconds, evacuating to the outside for alerts received within 10 seconds, and seeking shelter for higher floors if warned within 20 seconds [5]

Core Viewpoint - A 4.3 magnitude earthquake occurred in Qingcheng District, Qingyuan City, Guangdong Province on June 23 at 18:48, with a depth of 10 kilometers. The earthquake was felt by many residents in the Guangdong area, and prior to the earthquake, approximately 502,000 WeChat users received alerts from the "China Earthquake Early Warning" app about 10 seconds before the tremor [1]. Summary by Sections - The earthquake's magnitude and location details are provided, indicating a significant seismic event in Guangdong [1]. - The depth of the earthquake is noted as 10 kilometers, which is relevant for understanding the potential impact and felt intensity [1]. - The effectiveness of the early warning system is highlighted, with 502,000 WeChat users receiving timely notifications, showcasing the system's reach and responsiveness [1].