Laavatunneli

Thurstonin laavatunneli Havaijilla.
Laavapilari on harvinainen laavatunnelimuoto. Kuva Manjanggul laavapilarista, joka sijaitsee Manjanggul laavatunnelissa Jeju-saarella, Koreassa.

Laavatunneli (myös laavaputki) on nopeasti virtaavan laavan synnyttämä tunneli. Laavatunneleita syntyy pinnanalaisissa laavan virtauksissa ja silloin, kun laava virtaa pinnalla niin sanotussa laavakanavassa. Itse asiassa laavavirrassa ulompana oleva laava jähmettyy nopeammin kuin sisempänä oleva laava. Näin ollen sisempi laava virtaa ulompaa laavaa nopeammin. Tästä taas seuraa se, että uloimman laavan jähmetyttyä kiinteäksi sisempi laava virtaa sen sisältä ulos ja näin syntyy laavatunneli.[1]

Japanilaisen Kaguya-luotaimen Kuusta ottamissa kuvissa havaitun 65-metrisen reiän arvellaan olevan laavatunnelin suu.[2]

Lähteet

  1. ↑ Arthur B. Busbey III, Robert R. Coenraads, Paul Willis, David Roots: ”Laavaputket”, Kivet & fossiilit, s. 193. Suomentanut Jarmo Hakanen, Kaarlo Taipale, Riikka Taipale. Gummerus, 1999. ISBN 951-20-5347-0
  2. ↑ Nummila, Sakari: Kuun pinnalta löytyi valtava musta reikä Tähdet ja avaruus. 24.10.2009. Viitattu 30.1.2020.

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