hawaiian lava tubes with extraterrestrial habitat …hawaiian lava tubes with extraterrestrial...
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Hawaiian Lava Tubes with Extraterrestrial Habitat Applications
Jacob Just1,
Audai Theinat2, Dr. Amin Maghareh2,
Dr. Shirley Dyke1,2, Dr. Antonio Bobet2
Just; August 2, 2018
1 School of Mechanical Engineering, Purdue University2 Lyles School of Civil Engineering, Purdue University
Resilient ExtraTerrestrial Habitats (RETH)
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Purdue RETH Team
Resilient ExtraTerrestrial Habitats 2Just; August 2, 2018 purdue.edu/reth
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Overview
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•Extraterrestrial habitatsProblem statement
Potential solution
•Hawaiian lava tubeFormation
Morphology
•Case studyLunar applications
•Conclusions and future work
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Resilient ExtraTerrestrial Habitats 4
Problem Definition
• Extraterrestrial habitats are the next step in space exploration
•Numerous hazards pose threats to these habitats
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Purdue RETH
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Resilient ExtraTerrestrial Habitats 5
Potential Solution
• GRAIL data shows lava tubes on the Moon created during volcanic eruptions
• Could potentially house future habitats
• Lunar lava tubes are estimated to be up to several kilometers wide
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TwistedSifter
2 km
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Hawaiian Lava Tube Formation
D. Peterson
Molten Lava
Lava Channel
Crusted Lava
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Hawaiian Lava Tube Formation
Hawai’i Volcanoes National Park
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Hawaiian Lava Tube Formation
D. Peterson
Top View
Front View
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Hawaiian Lava Tube Formation
Hawai’i Volcanoes National Park
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• Shape is determined by topography and changes in direction
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Kaumana Cave and Morphology
• Terrestrial lava tubes have widths up to 30 meters
Arizona StateUniversity
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Resilient ExtraTerrestrial Habitats 11
Marius Hills Lava Tube
• Demonstrates the presence of subsurface features on the Moon
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Chappaz et al.SELENE
• Supported by multiple methods using data from several probes
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Extraterrestrial Habitat Virtual Reality
Just, Lyons, Theinat, Maghareh
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Hawaiian Lava Tubes• Tension Cut-off
• Tensile Stress / Compressive Stress
• Geological Strength Index (GSI)• Value 0 – 100 to measure strength• Stable Tension Cut-off of 3% for GSI
of 70
• Convergence• Difference between displacement in
top and bottom of lava tube
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• Geological Strength Index (GSI)• Stable Tension Cut-off of 3% for
GSI of 70
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Lunar Lava Tubes
RT:
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• Lava tubes could potentially house an extraterrestrial habitat
•Hawaiian lava tubes help in understanding their lunar counterparts
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Conclusions
• Lunar lava tubes can be stable up to several kilometers wide
TwistedSifter
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• Exploring lunar lava tubes via probes or manned missions
• Further investigating morphology and formation
•Determining impact of hazards on lava tubes
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Future Work
Purdue RETH
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References
•Chappaz, et al. (2014). Surface and Buried Lava Tube Detection with GRAIL Data.
•Bunnell, Dave. “Classic Lava Tube Passage.” TwistedSifter, 2006.
•Peterson, D. W., et al. (1994). Development of lava tubes in the light of observations at Mauna Ulu, Kilauea Volcano, Hawaii. Bulletin of Volcanology, 56(5), 343-360.
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• Stability classifications• Stable: No yielding • Quasi-stable: < 50% yielding• Unstable: > 50% yielding
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Lava Tube Stability [Backup]