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"The Moon's deepest interior, especially whether or not it has a core, has been a blind spot for seismologists," says Ed Garnero, a professor at the School of Earth and Space Exploration in ASU's College of Liberal Arts and Sciences. "The seismic data from the old Apollo missions were too noisy to image the Moon with any confidence. Other types of information have inferred the presence of a lunar core, but the details on its size and composition were not well constrained." Sensitive seismographs scattered across Earth make studying our planet's interior possible. After earthquakes these instruments record waves that travel through the interior of the planet, which help to determine the structure and composition of Earth's layers. Just as geoscientists study earthquakes to learn about the structure of Earth, seismic waves of "moonquakes" (seismic events on the Moon) can be analyzed to probe the lunar interior. When Garnero and his graduate student Peiying (Patty) Lin heard about research being done to hunt for the core of the Moon by lead author Renee Weber at NASA's Marshall Space Flight Center, they suggested that array processing might be an effective approach, a method where seismic recordings are added together in a special way and studied in concert. The multiple recordings processed together allow researchers to extract very faint signals. The depth of layers that reflect seismic energy can be identified, signifying the composition and state of matter at varying depths. |
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