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Астронет: Астрономическая картинка дня Неожиданно частые лунотрясения http://www.variable-stars.ru/db/msg/1484511/eng |
Credit & Copyright: NASA,
Apollo 11 Crew
Explanation:
Why are there so many moonquakes?
Analyses of
seismometers
left on the moon by the
Apollo moon landings reveals a surprising number of
moonquakes occurring within 100 kilometers of the surface.
In fact, 62
moonquakes were detected in data recorded between 1972 and 1977.
Many of these moonquakes are not only strong enough to
move furniture in a
lunar apartment,
but the stiff rock of the moon continues to vibrate for many minutes,
significantly longer than the softer rock
earthquakes on Earth.
The cause of the moonquakes remains unknown, but a
leading hypothesis is the collapse of underground faults.
Regardless of the source, future moon dwellings
need to be built to withstand the frequent shakings.
Pictured
here 50 years ago today,
Apollo 11 astronaut
Buzz Aldrin stands beside a recently deployed lunar seismometer, looking back toward the
lunar landing module.
Authors & editors:
Robert Nemiroff
(MTU) &
Jerry Bonnell
(USRA)
NASA Web Site Statements, Warnings,
and Disclaimers
NASA Official: Jay Norris.
Specific
rights apply.
A service of:
LHEA at
NASA /
GSFC
& Michigan Tech. U.