Groundbreaking Lunar Discovery Reveals New Moonquake Sources
In a significant advancement for space science, researchers at the Smithsonian Institution in Washington, D.C., have identified new sources of moonquakes that could critically influence future human missions to the moon. Their findings, published recently, highlight potential risks for NASA's Artemis program, which aims to return Americans to the lunar surface after more than five decades.
Mapping Lunar Tectonic Activity
The team created the first-ever comprehensive map of small mare ridges, geological features spanning the moon's dark plains, which indicate ongoing tectonic movements. Analysis shows these ridges formed relatively recently in the moon's four-billion-year history and are widespread across the lunar maria.
While moonquakes have long been attributed to Earth's gravitational pull, internal lunar processes, and meteoroid impacts, this map uncovers additional seismic sources linked to these ridges. This discovery could reshape site selection for lunar landings, as NASA accelerates efforts to establish a sustainable human presence on the moon.
Implications for Artemis and Beyond
Cole Nypaver, a post-doctoral research geologist at the Center for Earth and Planetary Studies, emphasized the importance of this work. "This helps us gain a globally complete perspective on recent lunar tectonism, leading to a better understanding of the moon's interior, thermal history, and seismic potential," he stated. The Artemis program, targeting crewed landings no earlier than 2027, must now account for these newfound seismic threats to ensure astronaut safety and mission success.
Key Findings from the Research
The study revealed over 1,100 new ridges on the moon's nearside, bringing the total known ridges to more than 2,600. These features, averaging 124 million years old, share similarities with lobate thrust fault scarps—curved hills formed by crustal stresses within the last billion years. Nypaver noted, "Since the Apollo era, we've known about scarps in the highlands, but this is the first documentation of their prevalence in the lunar maria."
This connection suggests moonquakes may occur more frequently across these plains than previously thought, posing additional hazards for exploration. The research builds on earlier studies indicating the moon is shrinking due to heat loss, which crinkles its surface and triggers tectonic activity.
Ensuring Safety in Space Exploration
Nathan Williams, a post-doctoral researcher at NASA's Jet Propulsion Laboratory, previously highlighted the moon's dynamic nature, stating, "The moon is still quaking and shaking from internal processes as it loses heat and shrinks." With NASA planning to construct a lunar base for future endeavors, understanding these seismic risks is paramount. Nypaver added, "A better grasp of lunar tectonics will directly benefit the safety and scientific outcomes of upcoming missions."
As humanity prepares to revisit the moon, these findings underscore the need for thorough geological assessments to mitigate risks and pave the way for sustainable exploration beyond Earth.
