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Ecco finalmente svelato il "tapis roulant" che muove i continenti: si tratta di una "patina" scivolosa al di sotto della crosta terrestre composta da materiali caldissimi, i quali risalgono in superficie.
Finora era difficile conoscere con precisione queste regioni; lo strato rovente si trova a 100 chilometri di profondità ed è spesso 1'000 metri. Con questi nuovi dati sarà possibile capire meglio i meccanismi che modellano le placche del nostro pianeta.
La scoperta è di un gruppo di ricercatori dell'Università Victoria in Nuova Zelanda, che ha utilizzato una tecnica simile all'ecografia, rilevando le vibrazioni di ritorno di una serie di cariche esplosive.
ATS/px
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