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Eruzioni vulcaniche

Eruzioni vulcaniche. Lezione del 29 Marzo 2012. Eruzioni sottomarine. Frammenti di ceneri idrovulcaniche. e pliniane.

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Eruzioni vulcaniche

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  1. Eruzioni vulcaniche Lezione del 29 Marzo 2012

  2. Eruzioni sottomarine

  3. Frammenti di ceneri idrovulcaniche e pliniane

  4. In this summary of hydrovolcanic experiments, four basic interaction phenomena, consisting of melt fountaining, unsteady blasts, steady production of steam and ejecta, and the nonexplosive quenching ofmelt into globular shapes (blobs), are correlated to volcanic activities and the water:melt mass ratio (Rm ).

  5. Scaled kinetic energy relative to the initial melt thermal energy is shown as a function ofwater:magma mass ratio. Ranges are indicated for Strombolian, Surtseyan (hydrovolcanic), andsubmarine activity as well as for corresponding landform and deposit bedforms.(Adapted from Wohletz and McQueen, 1984.)

  6. D = area compresa nell’isopaca 1/100 di quella massima F = % piroclastiti < 1 mm all’intersezione tra asse di dispersione e isopaca 1/10 della massima

  7. Volcanic Explosivity Index (VEI)

  8. Morfologie vulcaniche

  9. Poligeniche Monogeniche Positive Negative

  10. Morfologie monogeniche Coni di scorie saldate (Spatter cone) Coni di scorie stromboliane (Cinder cone) Coni di tufo, anelli di tufo Duomi lavici e spine Plateau monogenici Crateri Maar Caldere monogeniche

  11. Coni di scorie saldate – Spatter cone

  12. Cono di scorie saldate – Spatter cone

  13. Cono di scorie stromboliane – Cinder cone

  14. Cono di scorie stromboliane – Cinder cone

  15. Coni di scorie stromboliane

  16. Tuff cone, Main Ethiopian Rift

  17. A B C Plateau lavico monogenico

  18. Duomi lavici Endogeni Esogeni

  19. Duomo lavico, Mount St. Helens

  20. St. Helens

  21. Mount St. Helens

  22. Plug dome e Spina

  23. Lipari,

  24. Duomo esogeno, Castello d’Ischia

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