At the end of August 2022, JQuake's primary Earthquake Early Warning service provider will be shut down. Therefore, in the next major update of JQuake, the Project DM-D.S.S service (paid) will be made available as an alternative.

This service provides information distributed by the Japan Meteorological Agency (Japan Meteorological Service Support Centre) immediately via WebSockets, etc., and is highly reliable in terms of data reception and data quality. This service will also enable JQuake to provide more information and functions than it currently does, and will allow the same level of functionality outside Japan as it does in Japan.

Even if you choose not to use this paid service, you can still use JQuake free-of-charge after the end of August 2022. However, it will only use the backup data provider - National Institute for Earth Science and Disaster Prevention (NIED), which means that you may experience higher latency and less stable information.

We remain fully committed to keeping JQuake available for free, however, we will not be able to guarantee the quality of data and service when using JQuake for free in the future.

The next update will introduce support for the Project DM-D.S.S service. In addition, a special JQuake-specific subscription will be offered on the Project DM-D.S.S service for 550 yen (JPY) per month. This subscription will allow users to receive all Earthquake Early Warning (excl. training bulletins) and earthquake/tsunami information released by the JMA. All user information will be managed by the Project DM-D.S.S service.

Additionally, users who have subscribed to the Project DM-D.S.S service categories (telegram.earthquake: [earthquake and tsunami information], eew.forecast: [all EEW], eew.warning: [warning only EEW]) can use the functions according to the category to which they have subscribed. Note - there is no need to subscribe to both eew.forecast and eew.warning.

Users who subscribe to the option for additional simultaneous WebSocket connections can use multiple JQuake instances, and other applications at the same time. Note that to avoid overpayment, users who have both eew.forecast and telegram.earthquake subscriptions enabled won't be able to subscribe to the JQuake plan.

Before 08/30
(Users inside Japan)
Before 08/30
(Users outside Japan)
After 08/30
(Without DM-D.S.S)
After 08/30
(With DM-D.S.S)
Speed of Delivery
EEW 1st Report 300ms ~ 2s 300ms ~ 2s 300ms ~ 2s 30ms ~ 100ms
EEW 2nd Report + 300ms ~ 2s 300ms ~ 40s* 300ms ~ 40s* 30ms ~ 100ms
JMA Earthquake Info 5s ~ 1min 5s ~ 1min 5s ~ 1min 30ms ~ 100ms
JMA Earthquake Info
(Areas without access to Yahoo! Japan)
2min ~ 5min 2min ~ 5min 2min ~ 5min 30ms ~ 100ms
Tsunami Warnings/Advisories 2min ~ 3min 2min ~ 3min 2min ~ 3min 30ms ~ 100ms
Reliability of Delivery
Guaranteed Server Operation
Geographic Server Redundancy
Basic EEW
(excl. Deep EEW, Advanced EEW)
Deep Earthquake EEW (>150 km)
Advanced EEW
(PLUM Method, Level Method, etc.)
Expected Int. (incl. PLUM Method)
EEW Cancellation Reports
Detailed JMA Earthquake Info.
(Local Intensity Observations)
Tsunami Warning Area
Tsunami Exp. Height + Arrival Times

(*)  Earthquake Early Warnings delivered by NIED tend to be delayed for larger earthquakes. If the conditions for an earthquake early warning are not met at the announcement stage of an earthquake early warning, it may take a considerable amount of time before the earthquake early warning is received. For example:

  • 2022/03/16 Fukushima M6.1 foreshock – NIED alert delayed by 34 sec
  • 2022/05/22 Ibaraki M5.9 – NIED alert delayed by 19 sec
  • 2022/06/19 Ishikawa M5.4 – NIED alert on time (first delivered report)
  • 2022/08/10 Soya M5.4 – NIED alert delayed by 16 sec