In this article, we analyzed NHK's special disaster broadcasts that were on the air during the Great East Japan Earthquake in 2011 and the Noto Peninsula Earthquake in 2024, and found the following.
(1) In 2011, informational discourses attempted to convey the dangers of earthquakes and tsunamis mainly by using utterances to explain the situation. However, in the case of the 2024 Noto Peninsula Earthquake, they primarily used specific alert statements to warn of the dangers of earthquakes and tsunamis.
(2) Regarding call-to-action utterances, in the 2024 materials, after an utterance that called for evacuation, utterances with a high level of urgency such as “never stop or turn back” were used, and utterances with a high level of urgency were used to call for evacuation to a safe place.
(3) Regarding utterances that called for evacuation, during the Great East Japan Earthquake of 2011, the expression “Please evacuate to safe high ground as soon as possible” was repeatedly used. However, in the analysis materials for 2024, expressions with a high degree of urgency and explicitness, such as “Run to the highest possible place immediately,” were used, and the frequency of expressions was three times higher than that in 2011. Furthermore, as tsunami warnings changed to major tsunami warnings and the situation became more serious, expressions calling for evacuation changed from request expressions to command expressions, such as “Please run away immediately!” → “Evacuate now!” (4) Finally, compared to that in 2011, text information in 2024 covered the entire screen of the broadcast video, and text information rather than live footage of the tsunami was used to warn of the dangers of tsunamis. Furthermore, by displaying expressions that called for evacuation such as “Tsunami! Evacuation!, Tsunami! Evacuate!, EVACUATE! Tsunami! Evacuate!” directly on the broadcast screen, residents who were watching TV were actively asked to evacuate.