1. Dynamic types related to magma/water interactions Dynamic types related to dissolved bubbles Dynamic types related to domes growth and collapse Dynamic types related to lava flows etc. Complex edifices Destruction of volcanic edifices

2. Figure 4-2. Volcanic landforms associated with a central vent (all at same scale).

3. Réunion island

5. Réunion Island

6. Piton des Neiges (3100 m) (extinct) Piton de la Fournaise (2600 m) (active)

8. Lava flows and more lava flows… But note also the grey material at the bottom…

9. Helicopter view, NW coast (btw, this cliff tends to collapse quite often on the road. Last time was last week…)

10. Cones groupe in Réunion + flows

11. Shield volcano Mostly a pile of basaltic flows! Strombolian & Hawaian

12. Strato- volcanoes Figure 4-3. a. Illustrative cross section of a stratovolcano. After Macdonald (1972), Volcanoes. Prentice-Hall, Inc., Englewood Cliffs, N. J., 1-150. b. Deeply glaciated north wall of Mt. Rainier, WA, a stratovolcano, showing layers of pyroclastics and lava flows. © John Winter and Prentice Hall.

14. Lava flows… (Here, in the caldera wall on the top of Mt Pelée)

15. … and explosive phases

16. And erosion.

17. Shield volcanoes vs. stratovolcanoes Shield volcanoes Basaltic Intraplate (hotspot) Relatively flat Effusive (lava flows, strombolian cones) Minor explosive events (phreatic) Erosion and flank collapse Stratovolcanoes Andesitic to dacitic Subduction Rather steep Explosive (plinian/pelean) Minor andesitic flows a Erosion, lahars and flank collapse

18. Dynamic types related to magma/water interactions Dynamic types related to dissolved bubbles Dynamic types related to domes growth and collapse Dynamic types related to lava flows etc. Complex edifices Destruction of volcanic edifices

21. Erosion and rivers

23. Successive valleys and valley fills (Réunion Isl.)

25. Lahars

26. « Normal » landslides

27. Cilaos

28. Major landslides?

29. Major debris avalanches forming the populated plateaux…

31. Successive avalanches in the core of the volcano

32. Consolidated breccias

33. Megabreccias (Well, Ok, not in Réunion isl…Sorry, did not find photos from there)

34. Superposition of breccia and flows!

37. .. And more breccias

38. Evidence for successive events: Breccia cut by dykes

39. .. How major?

40. Piton de la Fournaise

41. Rift zone = major sliding plane?

43. Evolution by successive flank collapses?

46. A new view on shield volcanoes: A succession of lava flows, and erosion –Local erosion (lahar, valleys) –Local/big erosions (large landslides, big depressions) –Major landslides (flank collapse), might be associated with eruptions (as in MSH, but no hard evidence for that)

47. Volcanic islands: Tropical paradises or heaps of rubble?

48. Feeder dykes of later eruptions