lunedì 13 agosto 2007

Day 2: Mount Saint Helens - La potenza del vulcano

Allora... lo sapete cosa accade se una montagna di 2950 metri, che in realtà è un vulcano, ricoperta da neve e ghiaccio, improvvisamente esplode tutto d'un colpo? Ovvio: il disastro è assicurato. Questo è quello che è accaduto al Mt Saint Helens (seconda tappa del nostro viaggio) il 18 maggio del 1980. Già diversi mesi prima dell'esplosione, a causa della vivace attività sismica, la zona era stata evacuata per sicurezza. Troupes televisive erano accorse sul posto in attesa di filmare l'evento. E quella domenica mattina di maggio sono stati accontentati. L'eruzione causò la disintegrazione di una parte della montagna rimpiazzando la cima con un cratere a forma di ferro di cavallo di 1,5 km. (Per la cronaca la montagna ora è alta 2550 metri). La frana fu di proporzioni incredibili. Seguirono esplosioni di lava, cenere e pietre incandescenti. Il vulcano ha polverizzato tutto nel giro di svariate miglia e anche più lontano gli effetti sono stati devastanti. La cenere si depositò fino a centinaia di chilometri di distanza. I ghiacci sciolti ricopersero di fango varie cittadine. Nell'eruzione persero la vita 57 persone, migliaia di animali, vennero distrutte 250 case, 50 ponti e svariate miglia di strade e binari ferroviari. Un ingente danno economico per lo stato. Tra le persone che hanno perso la vita, loro malgrado sono diventati famosi Harry Truman, un 84 che decise di non abbandonare la casa da cui viveva da 54 anni alle pendici della montagna e il cui corpo non è stato mai ritrovato, e il vulcanologo David Johnston che studiò fino alla fine il fenomeno: la sua stazione di osservazione fu investita da una nuvola di cenere calda un attimo dopo aver pronunciato le parole divenute poi famose "Vancouver! Vancouver! This is it!".
Oggi l'area attorno al Mt Saint Helens è un parco nazionale dal 1982 con stazioni di ricerca e centri di educazione e osservazione per i turisti che possono farsi un po' di cultura sui vulcani seguendo video e ricostruzioni dell'evento. Non è possibile scalare la montagna se non con appositi permessi, ma comunque lo spettacolo è già impressionante dalla stazione di osservazione più vicina. Il paesaggio anche dopo 27 anni ricorda quello lunare e anche più lontano dall'epicentro non rimangono che alberi secchi e bruciati. Il vulcano comunque è ancora attivo e lava continua ad uscire in modeste quantità dal duomo che s'è formato al centro del cratere.

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