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Dopo il recente terremoto nelle Filippine, gli esperti dell'Istituto di sorveglianza americano (USGS) hanno potuto constatare che il social network ha lanciato l'allarme con diversi minuti di anticipo sui loro sofisticati strumenti.
La scorsa settimana, ad appena un minuto e sette secondi dal sisma di magnitudo 7,6 al largo delle coste filippine, il Twitter Earthquake Dispatch (un sistema che rileva quante volte viene inviata la parola chiave "terremoto") messo a punto dagli esperti americani dell'USGS ha segnalato un picco di messaggi, mentre i sismografi hanno impiegato molto di più a "rendersi conto" del pericolo.
Strumenti più laboriosi
" I nostri sensori hanno bisogno di circa cinque minuti per 'vedere' il terremoto", spiega Paul Earle dell'USGS, aggiungendo che in questo caso il monitoraggio del social network è arrivato con largo anticipo. Una simile situazione succede di regola in regioni discoste e prive di sismografi, mentre non accadrebbe ad esempio in California, dove il territorio è disseminato di strumenti di rilevazione.
Anche Twitter può sbagliare
Il Twitter Earthquake Dispatch, spiega ancora l'esperto, è comunque ancora in fase di "rodaggio" e qualche volta incappa ancora in errori grossolani, come quando c'è stato un forte aumento di tweet di allerta sisma in concomitanza con l'uscita della canzone "Earthquake" del cantante britannico Labrinth.
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