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saturday 16 november 2024
Automatically translated from Basque, translation may contain errors. More information here. Elhuyarren itzultzaile automatikoaren logoa
Geologia

Nepaleko lurrikaretako batek Everest mugitu du

Joxerra Aizpurua Sarasola
24 June 2015
Shrimpo1967-CC By SA
Zarata mediatikoz beteriko garai nahasiotan, merkatu logiketatik urrun eta irakurleengandik gertu dagoen kazetaritza beharrezkoa dela uste baduzu, ARGIA bultzatzera animatu nahi zaitugu. Geroz eta gehiago gara, jarrai dezagun txikitik eragiten.

2015eko apirilaren 25ean Nepalen gertatu zen lurrikarak, herrialdea hankaz gora jartzeaz gain, lekuz aldatu ditu gauzak. Hala, Txinan lurrikarak aztertzen dituen erakunde baten arabera, Everest hiru zentimetro mugitu da hego-mendebalderantz. Datu hori ezagututa baten batek pentsatuko du horrenbestez GPS koordenatuak aldatu beharko direla, eta hala da, baina esan beharra dago Everest, beraren azpian dauden xafla tektonikoen mugimenduaren eraginez, etengabe ari dela mugitzen.

Urtero, munduko mendi altuena lau zentimetro higitzen da ipar-ekialdera. Hortaz, azken hamar urteotan 40 zentimetro mugitu da. Lurrikarak mugimendu hori atzeratu baino ez du egin, hau da, orain urtebete zuen posiziora itzularazi du, gutxi gorabehera.

Baina Everest behetik gora ere mugitzen ari da, hau da, altxatzen. Horizontalean baino mugimendu txikiagoa du; hala ere, urtero 0,3 zentimetro handitzen dela kalkulatu da. Beraz, haren altuera 8.848 metrokoa dela esaten dugunean badakigu zifra ez dela zehatza, hitzartutako garaiera ofiziala baizik. Eta hala ere, txinatarren arabera Everest hori baino lau metro txikiagoa da, tontorrean duen lau metroko izotz geruza kendu behar baitzaio.

Geologia
ASTEKARIA
2467. zenbakia
2015eko ekainaren 28a
ASTEKARIA PDF-an
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