Moonquakes | Article about moonquakes by The Free Dictionary
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moonquakes Localized disturbances inside the Moon, detected by the Apollo seismic network. Rare but strong moonquakes occur 50–300 km below the surface, although they are much less intense than earthquakes by a factor of about 1000. Weaker but more numerous moonquakes occur at depths of 800–1000 km and are triggered at perigee by lunar tides. Seismic signals on the Moon are extended by scattering in the dry and porous lunar crust. Deep moonquakes provide information, through their arrival times, of the structure of the lunar interior: a 60 km crust on average, a mantle extending to a depth of 1100 km or more, and a central partly molten core roughly 500–600 km in radius.
References in periodicals archive
New identification of deep moonquakes
in the Apollo lunar seismic data', Phys.
By measuring where and when gases are vented, scientists hope to determine the frequency of moonquakes
and other disturbances.
These will measure the flow of heat underneath the surface and record vibrations from moonquakes
Instead, seismometers can focus on measuring waves created by moonquakes
, tremors created by a variety of sources, including the tidal tug of the Earth.
The penetrators, which have been designed to survive an impact deceleration of 10,000 g and may last for up to a year, will transmit their measurements of moonquakes
and heat flow via the orbiter.