Criteria for Issuance of Emergency Warnings

The criteria for issuance of Emergency Warnings are shown below.

Criteria for Meteorological Emergency Warnings

Reference: Relationships between criteria and indices

Criteria for Tsunami Emergency Warnings

In regard to tsunami, JMA maintains the system of warning nomenclature used until 29 August, 2013 but issues existing Major Tsunami Warnings in the new classification of Emergency Warnings.

Criteria for Tsunami Emergency Warnings

Criteria for Volcanic Emergency Warnings

In regard to volcanic eruptions, JMA maintains the system of warning nomenclature used until 29 August, 2013 but issues existing Volcanic Warnings (residential areas) in the new classification of Emergency Warnings.

Criteria for Volcanic Emergency Warnings 1

Criteria for Volcanic Emergency Warnings 2

Criteria for Earthquake Early Warnings (i.e., Warnings and Forecasts for earthquake ground motion)

In regard to earthquakes, JMA maintains the system of warning nomenclature used until 29 August, 2013 but issues existing Earthquake Early Warnings incorporating prediction of tremors measuring 6-lower or more on JMA's seismic intensity scale in the new classification of Emergency Warnings.

Criteria for EEW