如何在手机上设置地震警报

Setting Up Earthquake Alerts on Your Smartphone

Modern smartphones provide multiple pathways for receiving earthquake alerts, ranging from fully automatic government emergency broadcast systems that require no setup to customizable app-based notification systems. Setting up appropriate alerts takes only minutes but requires understanding which systems are available in your region and what each system is designed to deliver. A properly configured smartphone is one of the most effective personal 地震警报系统墨西哥的SASMEX系统，是世界上最早投入使用的公共地震预警系统之一，自1991年起运行，可为墨西哥城提供长达60秒的沿海地震预警时间。 available to the general public.

Wireless Emergency Alerts: No App Required

The most fundamental earthquake alert system on smartphones requires zero setup: the Wireless Emergency Alert (WEA) system. WEA uses cell broadcast technology — the same infrastructure that delivers AMBER alerts and presidential emergency notifications — to push alerts to all compatible phones in a defined geographic area simultaneously, regardless of whether users have data connections or are currently making calls. In California, Oregon, and Washington, the ShakeAlert预警系统由美国地质调查局及多所大学合作运营的美国地震预警系统，覆盖美国西海岸（加利福尼亚州、俄勒冈州、华盛顿州），通过无线紧急警报发送提醒。 system can deliver earthquake early warnings through WEA channels when a significant event threatens populated areas.

WEA alerts appear as a distinctive banner notification with a loud alarm tone that differs from standard ringtones. On most Android and iOS devices, WEA is enabled by default. To verify it is active on Android, navigate to Settings > Notifications > Advanced Settings > Wireless Emergency Alerts. On iPhone, go to Settings > Notifications and scroll to the bottom to find Emergency Alerts and Public Safety Alerts toggles.

The ShakeAlert预警系统由美国地质调查局及多所大学合作运营的美国地震预警系统，覆盖美国西海岸（加利福尼亚州、俄勒冈州、华盛顿州），通过无线紧急警报发送提醒。 Public Warning System

ShakeAlert预警系统由美国地质调查局及多所大学合作运营的美国地震预警系统，覆盖美国西海岸（加利福尼亚州、俄勒冈州、华盛顿州），通过无线紧急警报发送提醒。 is the USGS-operated 地震预警（EEW）一种在强震到达前探测地震并向人员和系统发送警报的系统，可提供数秒至数十秒的预警时间，足以采取自我保护行动。 system serving California, Oregon, and Washington. When the system detects an earthquake above the alerting threshold (typically M 4.5 or above), it evaluates the expected shaking at populated locations and issues WEA alerts to areas predicted to receive MMI IV or greater shaking. The alert specifies the expected shaking intensity and the estimated seconds until strong shaking arrives. Users who receive a ShakeAlert预警系统由美国地质调查局及多所大学合作运营的美国地震预警系统，覆盖美国西海岸（加利福尼亚州、俄勒冈州、华盛顿州），通过无线紧急警报发送提醒。 warning should immediately 就地、掩护、抓牢地震震动期间国际公认的防护行动：双手双膝着地，躲到坚固家具下方掩护，并抓牢直至震动停止。 and prepare for shaking.

Users outside the WEA broadcast zone for a specific event — or who want more customizable alert settings — can access ShakeAlert预警系统由美国地质调查局及多所大学合作运营的美国地震预警系统，覆盖美国西海岸（加利福尼亚州、俄勒冈州、华盛顿州），通过无线紧急警报发送提醒。 notifications through dedicated apps. The official ShakeAlert app is available for both iOS and Android and allows configuration of notification thresholds, distances, and supplemental information display.

Configuring Third-Party Alert Apps

Several third-party apps provide earthquake notification services beyond the official WEA infrastructure. Each offers different feature sets and coverage areas:

MyShake, developed at UC Berkeley, provides 地震预警（EEW）一种在强震到达前探测地震并向人员和系统发送警报的系统，可提供数秒至数十秒的预警时间，足以采取自我保护行动。 for ShakeAlert预警系统由美国地质调查局及多所大学合作运营的美国地震预警系统，覆盖美国西海岸（加利福尼亚州、俄勒冈州、华盛顿州），通过无线紧急警报发送提醒。 coverage areas plus real-time earthquake notifications globally. It allows users to set minimum magnitude and maximum distance filters. The app also contributes 加速度计测量地面运动加速度的传感器，对地震工程至关重要。现代强震加速度计能够记录大地震附近的剧烈震动。 data to the citizen science network described in the MyShake guide.

QuakeAlertUSA focuses on the US West Coast and allows granular notification customization including threshold settings as low as M 2.5 for local awareness. It displays a countdown timer and estimated shaking intensity for 地震预警（EEW）一种在强震到达前探测地震并向人员和系统发送警报的系统，可提供数秒至数十秒的预警时间，足以采取自我保护行动。 events.

EMSC Lastquake provides global coverage from the European-Mediterranean Seismological Centre and includes the ShakeMap community platform. It is particularly useful for travelers who want awareness of seismic activity in international destinations.

The 地震警报系统墨西哥的SASMEX系统，是世界上最早投入使用的公共地震预警系统之一，自1991年起运行，可为墨西哥城提供长达60秒的沿海地震预警时间。 in Mexico and Other Countries

Mexico City's 地震警报系统墨西哥的SASMEX系统，是世界上最早投入使用的公共地震预警系统之一，自1991年起运行，可为墨西哥城提供长达60秒的沿海地震预警时间。 (SAS), operated by CIRES since 1991, delivers alerts via a network of radio transmitters that activate dedicated receivers and sirens throughout the metropolitan area. The system detects earthquakes on the Pacific coast — up to 300 km from Mexico City — and delivers alerts with 50–120 seconds of warning time for distant Guerrero coast events. Mexico City residents can download the official SASMEX app to receive alerts on their smartphones synchronized to the physical siren system.

Japan's earthquake early warning is delivered through a comprehensive 地震警报系统墨西哥的SASMEX系统，是世界上最早投入使用的公共地震预警系统之一，自1991年起运行，可为墨西哥城提供长达60秒的沿海地震预警时间。 that pushes notifications through television, radio, NHK World app, and the J-Alert public warning system. Japan's system is mandatory in public broadcasting — every television channel interrupts programming to display the alert simultaneously when a significant event is detected.

Customizing Alert Thresholds

App-based notification systems allow you to balance awareness against alert fatigue. In seismically active regions like California, Japan, or Chile, setting a minimum threshold of M 2.5 within 50 km would generate daily or weekly notifications for minor events. A practical approach for most users is to set notifications for two scenarios: any event within 50 km above M 3.0 (local awareness) and any event within 200 km above M 5.0 (potentially felt events). Reserve early warning alerts — which interrupt whatever you are doing and demand immediate physical response — for M 4.5 or above within 100 km.

Location Services and Notification Accuracy

Earthquake notification apps use your device's location to calculate distance to events and determine which alerts apply to you. Allowing location access is essential for distance-filtered alerts. Some apps offer notification both for your current location (requiring active location permission) and for saved locations such as your home or workplace. Configuring saved locations ensures you receive notifications relevant to your most important places even when you are traveling elsewhere.

Integration with Smart Home Systems

For users with smart home platforms, earthquake alerts can trigger automated home safety responses. IFTTT (If This Then That) integrations connect earthquake notification apps to smart home devices — automatically closing smart garage doors, silencing smart speakers to enable emergency communication, activating smart locks, and sending alert messages to household members via messaging platforms. These automations are particularly valuable during nighttime hours when phones may be silenced but physical safety responses are still needed.

After the Alert: What to Expect

When a WEA or app-based early warning fires, users typically have 5–30 seconds before strong shaking begins, depending on distance from the 震中地震发生在地下的震源正上方对应的地表位置，新闻报道中通常将其作为地震发生的位置。. The appropriate immediate response is 就地、掩护、抓牢地震震动期间国际公认的防护行动：双手双膝着地，躲到坚固家具下方掩护，并抓牢直至震动停止。 — get under a sturdy table or desk, cover your neck and head, and hold on until shaking stops. After shaking ends, check your apps' post-event notifications: modern earthquake apps display updated 震级量化地震所释放总能量的单一数值。震级每增加一个整数单位，释放的能量约增加31.6倍。 estimates, 震度速报图（ShakeMap）美国地质调查局在地震发生后发布的成果，展示地面震动强度的分布情况，综合了地震仪数据、地震动模型以及“你感觉到了吗？”的报告。 products showing your area's shaking intensity, and links to “你感觉到了吗？”（DYFI）美国地质调查局的一项计划，收集震后公众的烈度报告，形成基于公众参与的烈度分布图，任何感受到地震的人都可以提交报告。 reporting. These post-event tools support situational awareness during the minutes and hours after a significant event.

Summary

Earthquake alerts on smartphones operate through two parallel systems: automatic government WEA broadcasts requiring no user action, and configurable app-based notifications offering greater customization. Understanding how ShakeAlert预警系统由美国地质调查局及多所大学合作运营的美国地震预警系统，覆盖美国西海岸（加利福尼亚州、俄勒冈州、华盛顿州），通过无线紧急警报发送提醒。 works, selecting appropriate threshold settings to avoid alert fatigue, and integrating notifications with smart home systems creates a comprehensive personal 地震警报系统墨西哥的SASMEX系统，是世界上最早投入使用的公共地震预警系统之一，自1991年起运行，可为墨西哥城提供长达60秒的沿海地震预警时间。 that maximizes warning time and enables effective immediate responses.