How Earthquake Early Warning Systems Work

Name: How Earthquake Early Warning Systems Work
Uploaded: 2026-08-25T11:03:09.185Z
Channel: Leadde
Description: Explains how seismic sensors detect initial P-waves, calculate seismic impact, and send rapid alerts to give seconds of life-saving warning.

Explains how seismic sensors detect initial P-waves, calculate seismic impact, and send rapid alerts to give seconds of life-saving warning.

LBy Leadde Updated August 25, 2026

How Does an Earthquake Early Warning Work?

An earthquake early warning is not a prediction. Sensors near the epicentre detect the fast, weak P-wave, software estimates the shaking from those first seconds of data, and an alert reaches phones ahead of the slower, damaging S-wave. The gap between the two waves is the warning: seconds near the epicentre, up to a minute further out.

That distinction decides whether the public trusts the system. Residents who believe an earthquake was forecast will treat a short warning as a failure, and a false alarm as proof the system does not work. Explaining the physics converts the alert from a broken promise into a head start. The material to leave in the source document is a specific warning time for a specific location — it depends on the epicentre, and publishing a number invites the complaint that it did not arrive.

The sequence runs across seven scenes: two on the two wave types and why one outruns the other, one on how the estimate is made from partial data, one on why the warning is shorter near the epicentre, two on what the seconds are actually enough for, and one on what the alert sounds and looks like on a phone.

How to Turn a Warning Into Something People Do in Five Seconds

A public safety explainer is measured by behaviour under stress, not by comprehension in the calm. The alert arrives once, gives no time to think, and competes with the instinct to look up or run outside. Everything in the video has to be built for recall, not for understanding.

Teach one action, not a list

Drop, cover, hold on. A viewer given three ranked options will spend the warning window choosing between them. The video should not offer a choice it does not have time for.

Rehearse the sound, not just the message

Play the alert tone in the video. Recognition of the sound is what triggers the action; the words on the screen arrive too late to be read in a shaking room.

Explain the short warning before it happens

Residents nearest the epicentre get the least notice and the worst shaking. Saying so in advance is the only thing that prevents the system being blamed for the physics.

Cover the false alarm honestly

Every system issues them. A community told in advance that occasional false alerts are the cost of speed keeps responding; one that is surprised by the first false alarm stops.

Build it from the guidance you have already published

Upload the public alert guidance, the household preparedness leaflet, or the emergency page from your own site in PDF, DOCX, DOC, PPTX, or TXT, up to 200 MB. Scenes come back ready to edit; the original stays as it is.

Localising It for Your Area

Name the authority that issues the alert

Residents act on alerts they can attribute. Put the issuing agency, the app or channel it comes through, and the official alert tone in the first two scenes, so the message and its source arrive together.

Anchor the seconds to a local distance

Abstract warning windows do not stick. Use two named locations from your own area — one near a known fault segment and one fifty kilometres out — and give each the seconds it would realistically receive.

Publish it in every language the area speaks

Emergency guidance that reaches only the majority language leaves out the households least likely to have other sources. The same seven scenes regenerate across 88 languages and 175 dialects, so each community version carries the identical approved instruction.

Earthquake Early Warning FAQ

Between roughly two seconds and about a minute, depending entirely on distance from the epicentre. Directly above it there may be none, because the two waves arrive almost together — which is why the video should teach the action rather than promise a duration.

No. A prediction claims an event before it starts. An early warning is issued after rupture has begun and only reports what has already been measured, which is why it is reliable and also why it is short.

Leadde produces the explainer, exported as HD MP4 or shared as a hosted link. The alert itself is issued by your alerting system, and any legal requirement about official emergency messaging is decided by your authority — the video explains the system, it is not part of it.

Upload the revised guidance and regenerate the two scenes showing the app and the tone. Every other scene holds, which is what makes a channel change survivable when the video exists in a dozen languages.

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