Warning: There are inherit dangers when exploring lava tubes including cave-ins, rock falls, and razor-sharp rocks. Before entering the lava fields, we highly-recommend long pants, closed-toe shoes, gloves, and hard-hat. Beware of your surroundings and the location of each member in your party.
Lava tubes are constructed when the surface of a low-viscosity lava flow cools forming a hard and continuous crust. This crust thickens forming a solid roof which insulates the still-flowing molten lava stream. When the eruption ends, the lava stream continues to flow out the end of the tube leaving an empty void under this solid basaltic rock surface.
Location A – N34 44.919, W116 22.304 – places you on the West-ridge of a collapsed formation. Inspect the large trench before you both up-slope and down-slope.
Location B – N34 44.940, W116 22.295 – places you at several lava tube openings. Compare the floor surface with the wall and roof.
1. The text "GC24KBM Pisgah Lava Tubes" on the first line.
Send us a note with:
2. Post the number of people in your group with a group picture at Location B.
3. At Location A, what is the estimated width of this collapsed formation?
4. What is the difference in elevation between Location A and lava tube opening at Location B?
5. Is this collapsed formation one large lava tube or a series of lava tubes? Why?
The above information was compiled from the following sources:
- Lavic Lake, Global Volcanism Program, http://www.volcano.si.edu/world/volcano.cfm?vnum=1203-19-
- USGS definition of Pahoehoe, http://volcanoes.usgs.gov/images/pglossary/pahoehoe.php
- USGS definition of Lava Tube, http://volcanoes.usgs.gov/images/pglossary/LavaTube.php