地震警報システム
jishin keihō shisutemuAn automated system that detects seismic activity and issues warnings to the public before the arrival of strong earthquake waves.
地震警報システムは、P波とS波の到達時間差を利用して警報を出す。
The earthquake early warning system issues alerts by utilizing the time difference between P-waves and S-waves.
JR東日本は、地震警報システムを活用して新幹線の運行を制御している。
JR East utilizes the earthquake early warning system to control Shinkansen train operations.
Commonly abbreviated as EEW (Earthquake Early Warning) in English contexts.
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💡Pro Tip
Understanding the system
The system detects P-waves (primary seismic waves) first, which are faster but less damaging, to predict the arrival of S-waves (secondary waves) that cause most damage. This gives critical seconds for safety measures.
⚡Gold Rule
Accuracy vs. Speed Trade-off
Higher accuracy in earthquake prediction often reduces warning time. Systems prioritize early detection over perfect precision to save lives.
📖Word Origin
Combines '地震' (jishin, earthquake) + '警報' (keihō, alert/warning) + 'システム' (shisutemu, system). The term emerged in the 2000s with advancements in seismic detection technology in Japan.
📝Usage Notes
Primarily used in Japan and regions prone to earthquakes. The system provides seconds to minutes of warning, depending on proximity to the epicenter.