Using Moonquakes to Detect Lunar Ice

• Lunar subsurface ice is critical for future human habitats, providing water, oxygen, and rocket fuel.
• Researchers have developed a method to locate these deposits by analyzing seismic waves from moonquakes, which exhibit distinct velocity changes when traveling through ice.

Seismic Detection Mechanism

• Scientists from the University of Maryland, Lawrence Berkeley National Laboratory, and the University of Hawai'i found that seismic waves travel two to three times faster through icy regolith than through dry soil or sand.
• The interaction of seismic waves with dense, stiff ice-cemented structures creates detectable "bounce back" signatures, allowing for estimates of both ice presence and volume.

Validation Methods

• The research team employed three distinct validation strategies:
  • X-ray tomography of frozen, lunar-analog volcanic rock from Arizona to observe how ice fills spaces between dust grains.
  • Temperature modeling of polar regions to identify areas where ancient, sunlight-shielded ice remains.
  • Computer simulations of minor moonquakes to model wave behavior in underground icy environments.

Future Exploration

• Current spectroscopic data suggests lunar soil contains 100–400 mg/g of water.
• Upcoming missions like China's Chang'e-7 will deploy seismometers near Shackleton Crater to search for these deposits.
• The 2028 Artemis mission aims to establish a Lunar Environmental Monitoring Station to perform further long-term seismic studies.