
緊急地震速報首度遭撤銷,起因於誤用遠距離觀測點資料及震源位置誤判。
日本氣象廳16日中午對北海道至東海地區發布規模9.9的緊急地震速報後緊急撤銷,氣象廳坦承為人為疏失,因誤用約1800公里遠的觀測資料及震源誤判導致規模被過度高估,並為此鞠躬致歉。
AI-generated summary
日本氣象廳過去在2020年鳥島近海地震中,也曾因使用震源過遠的資料而造成規模高估。
日本氣象廳16日中午12時40分左右,對北海道至東海地區廣泛區域發布緊急地震速報,預測將有強烈搖晃,8分鐘後又緊急撤銷。這起誤報推定的震源為千島列島,規模高達9.9,實際上卻是堪察加半島附近發生的規模6.9地震,導致交通機關受到影響。氣象廳證實,這是緊急地震速報「警報」級別首次被撤銷,並為此致歉。
氣象廳在當晚第三度召開記者會說明原因,指出本應排除的遠距離觀測點資料被錯誤使用,導致規模被過度高估。過去在2020年鳥島近海地震中,也曾因使用震源過遠的資料而造成高估,因此氣象廳已設定超過震源700公里的觀測資料不納入規模計算,但此次該設定未正常運作,竟使用了距離推定震源約1800公里遠的資料。
氣象廳坦言,此為人為疏失,已採取緊急對策。此外,氣象廳也將震源位置誤判,比實際位置偏離600多公里,導致規模被高估,後續在推估搖晃時,又以另一個更接近日本的地點作為震源計算,進一步造成搖晃預估過大,相關細節仍在調查中。
調查課課長青木重樹在記者會上鞠躬致歉,表示「此次錯誤發布緊急地震速報,給國民帶來極大困擾與負擔,深表歉意」,並強調已進行相關人員處置,呼籲民眾未來收到緊急地震速報時,仍應照常採取保命行動。

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