Fig. 3.

a The first message was sent to the inhabitants of all Greek islands located within the triangle Ikaria—Kos—Chios after the 2020 Samos (Aegean Sea) earthquake. It included guidelines in Greek and English language and advice for staying away from coasts in order to avoid the adverse effects of possible tsunami generation. b The second message was exclusively sent to the Samos residents urging them to stay away from buildings, remain in safe outdoor sites and not to use telephone unless to seek help. Both messages contained links to sites of the General Secretariat of Civil Protection with protection measures during the aftershock period. c, d Residents in the earthquake-affected area of Izmir in Turkey were alerted to download the mobile application “IamSafe aka Güvendeyim” (c) and notify themselves as “I am safe”. d The updated version of the application is also available in English