moonquake
moonquake Seismic activity on the Moon resulting from internal sources (differential cooling or tidal distortions) or external sources, e.g. meteoritic impact. It is the lunar equivalent of an earthquake. All moonquakes are less than 2 on the Richter magnitude scale. About 3000 per year were recorded by the Apollo seismometers. The lunar seismic signals have very low attenuation and a large degree of wave scattering, consistent with travel through a brecciated crust. Most moonquakes occur at about 1000 km depth and are probably induced by tidal stresses, related to periodic changes in the Earth—Moon distance. No lunar tectonic activity is evident. Rare surface moon-quakes are caused by the impacts of meteorites.
More From encyclopedia.com
Eugene M. Shoemaker , Shoemaker, Eugene Merle
SHOEMAKER, EUGENE MERLE
Alice Springs, Australia, 18 July 1997), space science, astrogeology, studies of the populations of c… Tides , Tides
Introduction
A tide is the alternating rise and fall in sea level that occurs at marine coastal regions each day. The sea level change is cause… Phase , phase / fāz/ • n. 1. a distinct period or stage in a process of change or forming part of something's development: the final phases of the war| [as a… Moon (satellite) , Moon
The Moon was the subject of widespread folklore in ancient times. While the brightest object in the night sky, it is not so bright that its surf… Moon , The Moon was the subject of widespread folklore in ancient times. While the brightest object in the night sky, it is not so bright that its surface t… Warren Moon , Moon, Warren 1956–
Professional football player
For more than ten years Warren Moon has been a starting quarterback in the National Football League,…
About this article
moonquake
All Sources -
You Might Also Like
NEARBY TERMS
moonquake