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Regolari e progressive aperture del foro praticato nel terreno a Kleinhüningen, per un progetto di geotermia fallito e abbandonato ormai da sei anni per le sue conseguenze sismiche, serviranno a evitare che nella regione di Basilea si possa produrre nuovamente un terremoto di magnitudo tale da poter essere percepito dalla popolazione. L'operazione è stata compiuta con successo per la prima volta la scorsa settimana, senza che ci siano state conseguenze.
Il processo, durato sei ore, sarà ripetuto a scadenze settimanali per oltre due mesi, allo scopo di ridurre la pressione di almeno un bar dagli 8,5 attualmente misurati. C'è stata anche una fuoriuscita di venti metri cubi d'acqua, che non ha sorpreso i tecnici.
La decisione di procedere è stata presa a causa di un aumento delle microscosse negli ultimi mesi. I costi previsti ammontano a 250'000 franchi.
pon/ATS
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