KR_EQK

Earthquake alerts from Korea and Japan, in one browser tab.

The KR_EQK monitor in its idle state
The idle view — Korea and Japan with the latest reports.

Easy for anyone — just type eqk.earthquake.kr in your address bar.

Go to the service

When an earthquake strikes Korea

The KMA issues its earthquake alerts within seconds of a quake. The monitor switches views the moment one arrives, drawing the P-wave and S-wave spreading from the epicentre, and fills in measured intensity by province once the detailed report follows.

A Korean earthquake early warning on screen
Earthquake Early Warning — A replay of the actual early warning for the December 2021 offshore Jeju earthquake — estimated at M5.3 at the time, with forecast intensity shaded by province.
A Korean earthquake report on screen
Earthquake Report — The follow-up earthquake report for the same event — finalised at M4.9 with a maximum intensity of Ⅴ, and measured intensity shaded by province.

When an earthquake strikes Japan

25 June 2026, 07:30 — off the coast of Iwate

A real M6.9 event that reached a maximum intensity of 6 Upper on the JMA scale.

  1. Emergency Earthquake Warning issued

    When the warning arrives, P- and S-waves begin spreading from the epicentre.

    If the telegram carries forecast intensities by region, those appear in the panel on the right.

    A JMA earthquake early warning — P and S waves spreading from the epicentre
    The 19th bulletin. The warning box sits top-left while the P- and S-waves spread from the epicentre; because this is a replay, the clock shows the original time in yellow.

  2. Seismic Intensity Bulletin issued

    Observed intensities are listed in the right-hand panel and shaded onto the affected regions on the map.

    A JMA seismic intensity bulletin on screen
    Observed intensity badges by subdivision. Magnitude and depth are still being analysed.

  3. Hypocentre Information issued

    Once the hypocentre and magnitude are determined, they are added to the display.

    A JMA hypocentre report on screen
    The confirmed hypocentre and magnitude.

  4. Intensity Report by Region issued

    The final report lists observed intensity for every region — shown in the right-hand panel and shaded across the map.

    A JMA intensity-by-area report on screen
    Intensity badges by subdivision, coloured with the NHK intensity palette.

When a tsunami advisory is issued

When a tsunami bulletin is issued, coastlines are drawn in the colour of their grade — Major Tsunami Warning, Tsunami Warning, Tsunami Advisory — with estimated arrival times and wave heights listed per forecast zone.

A JMA tsunami forecast — coastlines coloured by warning level
Tsunami forecast data from the Noto earthquake — 21 forecast zones across three grades.

Design customisation

The Design tab in settings lets you customise how the map is drawn — from intensity marker designs to per-station intensity display, a range of design options is available.

The design tab in settings
The Design tab — Every design option comes with a preview, so you can check the look before you choose.

Mobile support

The service works on mobile too — a layout built for small screens that puts information delivery first.

The mobile layout in its idle state
The idle mobile view — the bottom sheet holds the list of recent bulletins.
The mobile layout during a JMA earthquake early warning
The mobile view during a Japanese EEW — the bottom sheet holds the bulletin details and intensity by region.

And the rest

Multilingual support
The service supports Korean, Japanese and English. (With Japanese selected, Korean place names appear in English, and overseas earthquake reports do not support localised place names.)
Alert sounds
Each kind of bulletin plays its own alert sound, so you can tell what was issued at a glance by ear. You can preview them all in settings.
Simulations
Replay real past bulletins to see exactly how the screen behaves. Replays stay on your screen only.
Auto zoom
When an earthquake strikes, the map adjusts its own zoom to follow the spreading waves and the extent of each bulletin.
DMDATA link
For even faster delivery of Japanese earthquake early warnings, you can link your own DMDATA subscription. Your API key is never stored on our servers — it stays in your browser only.

Real-time live stream

The service streams live on YouTube, 24 hours a day.

Watch on YouTube

Free to use, always.

The service is free for personal use, and you are welcome to put it on screen for broadcasts and streams.