휴대폰에서 지진 경보 설정하는 방법

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 Seismic Alert SystemMexico's SASMEX, one of the world's first public earthquake early warning systems, operational since 1991. Provides up to 60 seconds of warning for Mexico City from coastal earthquakes. 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 ShakeAlertThe US earthquake early warning system operated by USGS and university partners. Covers the West Coast (California, Oregon, Washington) and sends alerts through Wireless Emergency Alerts. 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 ShakeAlertThe US earthquake early warning system operated by USGS and university partners. Covers the West Coast (California, Oregon, Washington) and sends alerts through Wireless Emergency Alerts. Public Warning System

ShakeAlertThe US earthquake early warning system operated by USGS and university partners. Covers the West Coast (California, Oregon, Washington) and sends alerts through Wireless Emergency Alerts. is the USGS-operated Earthquake Early Warning (EEW)A system that detects an earthquake and sends alerts to people and systems before strong shaking arrives. Can provide seconds to tens of seconds of warning, enough to take protective action. 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 ShakeAlertThe US earthquake early warning system operated by USGS and university partners. Covers the West Coast (California, Oregon, Washington) and sends alerts through Wireless Emergency Alerts. warning should immediately Drop, Cover, and Hold OnThe internationally recommended protective action during earthquake shaking. Drop to your hands and knees, take cover under sturdy furniture, and hold on until shaking stops. and prepare for shaking.

Users outside the WEA broadcast zone for a specific event — or who want more customizable alert settings — can access ShakeAlertThe US earthquake early warning system operated by USGS and university partners. Covers the West Coast (California, Oregon, Washington) and sends alerts through Wireless Emergency Alerts. 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 Earthquake Early Warning (EEW)A system that detects an earthquake and sends alerts to people and systems before strong shaking arrives. Can provide seconds to tens of seconds of warning, enough to take protective action. for ShakeAlertThe US earthquake early warning system operated by USGS and university partners. Covers the West Coast (California, Oregon, Washington) and sends alerts through Wireless Emergency Alerts. coverage areas plus real-time earthquake notifications globally. It allows users to set minimum magnitude and maximum distance filters. The app also contributes AccelerometerA sensor that measures acceleration of ground motion, critical for earthquake engineering. Modern strong-motion accelerometers can record the intense shaking close to large earthquakes. 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 Earthquake Early Warning (EEW)A system that detects an earthquake and sends alerts to people and systems before strong shaking arrives. Can provide seconds to tens of seconds of warning, enough to take protective action. 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 Seismic Alert SystemMexico's SASMEX, one of the world's first public earthquake early warning systems, operational since 1991. Provides up to 60 seconds of warning for Mexico City from coastal earthquakes. in Mexico and Other Countries

Mexico City's Seismic Alert SystemMexico's SASMEX, one of the world's first public earthquake early warning systems, operational since 1991. Provides up to 60 seconds of warning for Mexico City from coastal earthquakes. (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 Seismic Alert SystemMexico's SASMEX, one of the world's first public earthquake early warning systems, operational since 1991. Provides up to 60 seconds of warning for Mexico City from coastal earthquakes. 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 EpicenterThe point on the Earth's surface directly above the hypocenter (focus) where an earthquake originates underground. Often reported as the earthquake's location in news reports.. The appropriate immediate response is Drop, Cover, and Hold OnThe internationally recommended protective action during earthquake shaking. Drop to your hands and knees, take cover under sturdy furniture, and hold on until shaking stops. — 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 MagnitudeA single number that quantifies the total energy released by an earthquake. Each whole number increase represents roughly 31.6 times more energy released. estimates, ShakeMapA USGS product that displays the distribution of ground shaking intensity after an earthquake. Combines seismograph data, ground motion models, and 'Did You Feel It?' reports. products showing your area's shaking intensity, and links to Did You Feel It? (DYFI)A USGS program that collects intensity reports from the public after earthquakes to create community-derived intensity maps. Allows anyone who felt an earthquake to submit a report. 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 ShakeAlertThe US earthquake early warning system operated by USGS and university partners. Covers the West Coast (California, Oregon, Washington) and sends alerts through Wireless Emergency Alerts. works, selecting appropriate threshold settings to avoid alert fatigue, and integrating notifications with smart home systems creates a comprehensive personal Seismic Alert SystemMexico's SASMEX, one of the world's first public earthquake early warning systems, operational since 1991. Provides up to 60 seconds of warning for Mexico City from coastal earthquakes. that maximizes warning time and enables effective immediate responses.