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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

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1 School of Mechanical Engineering, Purdue University2 Lyles School of Civil Engineering, Purdue University

Resilient ExtraTerrestrial Habitats (RETH)

Purdue RETH Team

Resilient ExtraTerrestrial Habitats 2Just; August 2, 2018 purdue.edu/reth

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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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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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

• 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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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

• Geological Strength Index (GSI)• Stable Tension Cut-off of 3% for

GSI of 70

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Lunar Lava Tubes

RT:

• 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

• 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

Thank you!

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Purdue.edu/rethjustj@purdue.edu

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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.

• Stability classifications• Stable: No yielding • Quasi-stable: < 50% yielding• Unstable: > 50% yielding

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Lava Tube Stability [Backup]