Arus Konveksi

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Arus Konveksi

Postoleh ignprimadi » Min Mei 27, 2012 9:48 pm

Salam Geosaintis Muda Indonesia,

Saya ingin bertanya,
Apakah mantel dalam bumi terjadi pergerakan karena adanya arus konveksi yang terjadi pada mantel luar(astenosfer) dan inti luar bumi?
Kalau ada, Mengapa?
Terima kasih!
Post: 1
Bergabung: Sen Apr 23, 2012 8:54 pm

Re: Arus Konveksi

Postoleh wijayaryputu » Sab Des 22, 2012 9:42 pm

Arus konveksi merupakan arus yang terbentuk akibat pemuaian benda cair, padat atau gas karena naiknya suhu. Pemuaian menyebabkan berat jenis mengecil atau ringan, sehingga bergerak naik turun, sedangkan bagain yang lebih dingin, lebih berat akan bergerak turun. Sementara itu benda yang netral yang mengapung bergerak secara lateral. Sehingga konsep arus konveksi dapat diterapkan dalam konsep pergerakan lempeng kulit bumi. Gambar 1

Ahli seismology mengungkapkan fakta bahwa susunan mantle bumi adalah berupa komponen liquid yang mana mempunyai densitas lebih besar dibandingkan dengan lithosfer. Hal ini dibuktikan dari hasil rekaman "first break" gelombang seismik yang dihasilkan oleh gelombang gempa yang ditangkap geophone di permukaan di berbagai negara. Dimana adanya perbedaan kecepatan penjalaran yang ditangkap oleh geophone. Gambar 2

Sehingga arus konveksi pada bumi dapat disimpulkan bahwa arus konveksi tersebut terjadi di mantle bumi yang disebabkan oleh adanya sumber panas dari inti bumi. Sehingga hasilnya dapat menggerakkan lempeng-lempeng di lithosfer.


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Bergabung: Sel Des 18, 2012 10:32 am


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