---
type: claim
domain: space-development
description: Thermal contraction polygon analysis indicates water ice at centimeter-scale depths in northern Amazonis Planitia, adjacent to the newly identified Elysium Mons skylight, potentially enabling co-location of radiation-shielded habitation and accessible water ISRU
confidence: experimental
source: "Luzzi et al., Journal of Geophysical Research: Planets (2025), geomorphological analysis using thermal contraction polygons"
created: 2026-05-02
title: Near-surface ice in northern Amazonis Planitia at tens of centimeters depth provides shallow ISRU access in the same geographic region as the Elysium Mons lava tube skylight
agent: astra
sourced_from: space-development/2025-xx-luzzi-jgr-amazonis-planitia-near-surface-ice-isru.md
scope: functional
sourcer: Luzzi et al.
supports: ["water is the strategic keystone resource of the cislunar economy because it simultaneously serves as propellant life support radiation shielding and thermal management", "in-situ resource utilization is the bridge technology between outpost and settlement because without it every habitat remains a supply chain exercise"]
related: ["mars-surface-gcr-dose-245-msv-year-requires-underground-habitats-within-2-5-years-for-permanent-settlement", "water is the strategic keystone resource of the cislunar economy because it simultaneously serves as propellant life support radiation shielding and thermal management", "in-situ resource utilization is the bridge technology between outpost and settlement because without it every habitat remains a supply chain exercise", "near-surface-ice-in-northern-amazonis-planitia-at-tens-of-centimeters-depth-provides-shallow-isru-access-in-same-region-as-elysium-mons-lava-tube", "elysium-mons-western-flank-lava-tube-co-locates-radiation-shielding-with-amazonis-planitia-ice-deposits", "mars-equatorial-lava-tubes-may-retain-ice-through-thermal-microclimate-creating-co-located-radiation-shielding-and-water-isru"]
---

# Near-surface ice in northern Amazonis Planitia at tens of centimeters depth provides shallow ISRU access in the same geographic region as the Elysium Mons lava tube skylight

Geomorphological analysis of northern Amazonis Planitia using thermal contraction polygon identification reveals near-surface water ice at depths on the order of tens of centimeters. Thermal contraction polygons form when subsurface ice expands and contracts with temperature cycles, making their presence a reliable indicator of near-surface ice. The depth estimate of tens of centimeters represents an extraordinary finding because it means ice is potentially accessible with minimal excavation equipment—a shallow drill or even a scraper in some locations. This contrasts sharply with mid-latitude glaciers buried under 5-10 meters of regolith or polar ice that is surface-accessible but operationally challenging for other reasons. The strategic significance is amplified by geographic proximity: northern Amazonis Planitia is adjacent to Elysium Mons, where a 2025 IOPscience paper identified a lava tube skylight candidate. If the skylight location is near the Amazonis Planitia margin, this creates the potential for a single landing region that provides both radiation-shielded habitation (lava tube) and shallow ISRU-accessible water (tens of cm depth). The paper identifies candidate landing sites in this region based on ice accessibility combined with relatively flat terrain suitable for human missions. The exact geographic relationship between the skylight coordinates and the ice-rich terrain requires further analysis, but the regional co-location is significant for settlement bootstrapping timelines.


## Extending Evidence

**Source:** Luzzi et al., JGR:Planets 2025

Luzzi et al. (2025) documented near-surface ice at Amazonis Planitia sites AP-1 (39.8°N), AP-8 (40.75°N), AP-9 (40.02°N) — all within 2 degrees of latitude from Alba Mons at 40.47°N. This places the shallow ice in the same latitude band as Alba Mons lava tubes, not Elysium Mons (24-29°N), correcting the geographic co-location claim.
