1. Volcanism in the Solar System Part 1: Inner Solar System Justin Filiberto Lunar and Planetary Institute

2. Plan of Talk 1.Earth - review 2.Inner Solar System Mercury Venus Moon Mars 3.Outer Solar System Io Enceladus Titan Triton 4.Summarize Volcanoes in the Solar System

3. Earth’s Shield Volcanoes

4. Earth’s Composite/Stratovolcanos

5. Shield vs. Composite

6. Earth’s Volcanoes Cinder Cone Caldera Complex Lava Flows Tuff Ring And many more…

7. Mercury Mercury Earth From Sun (AU) 0.39 1.0 Mean radius (km) 2434 6371 Mass (1024kg) 3.30 5.98 Surface T (K) 340 295 Gravity (m s-2) 3.7 9.8

8. Mercury Volcanoes Seen by Messenger Spacecraft more to come…

9. Mercury

10. Venus Venus Earth From Sun (AU) 0.72 1.0 Mean radius (km) 6052 6371 Mass (10 24 kg) 4.87 5.98 Surface T (K) 735 295 Gravity (m s -2 ) 8.9 9.8

11. Venus Surface Landers: Venera & VEGA

12. Sapas Mons 400 km across, 1.5 km tall Slope ~ 0.5° Very long flows What type of Volcano?

13. Maat Mons JPL Press Image 20x Vertical Exaggeration Unexaggerated … What type of Volcano?

14. Pancake Domes Single Flows, Steep sides Height 1/2 - 1 km. What kind of volcano? What kind of lava?

15. Pancake Domes Rhyolite? Or merely cold, crystal-rich basalt? What kind of volcano? What kind of lava?

16. ? Low cones in flat lava plains A few km diam. (5 km for inset) What type of lava? What kind of volcano?

17. Venus vs. Earth

18. Moon 1/3 diam of Earth 1/6 gravity Dark, low, mare plains.

19. Mare Plains

20. Channels

22. Domes Gruithuisen domes 20 km across, 1.2 km tall. Avg ~7° slope; steepest ~20°. Are these volcanic? If so, what are they most like on Earth?

23. Gruithuisen Domes

24. Mars Mars Earth From Sun (AU) 1.5 1.0 Mean radius (km) 3386 6371 Mass (10 24 kg) 0.642 5.98 Surface T (K) 227 295 Gravity (m s -2 ) 3.7 9.8

25. Olympus Mons 640 x 840 km across 21 km tall Avg slope 5° What kind of volcano? What kind of lava?

26. Lava Flows on O.M. 1

27. Tharsis Tholus 150 km across 8 km tall What kind of volcano? What kind of lava?

28. Small Hill Steep Slope, ~30° Surrounded by thin lava flows What is it? On Syrtis Major, a Shield Volcano

29. Broken Cinder Cone? On Syrtis Major, a Shield Volcano

31. Inner Solar System Summary What features? Types of volcanoes? Lava compositions? Similarities? Differences? Generalities? What types of volcanoes are common to the Earth only? Why? What types of volcanoes are common in the inner solar system? What does this suggest about the cooling histories of the inner planets?

32. Some questions to ponder What types of volcanoes are common to the Earth only? Why? What types of volcanoes are common in the inner solar system but not the outer? Why? What does this suggest about the cooling histories of the inner planets? Outer planets?

33. Some questions to ponder From the volcanoes we have seen which ones would we expect on which planets? What do they suggest about other planets? Since most of us do not live near a volcano, how can students connect volcanoes on the Earth and other planets?