An enumeration district is a geographic area determined for purposes of taking the census. In one city there may be many enumeration districts, so once you enter a city, county, or state, you can narrow your results by entering street level information, or investigate enumeration district maps, or descriptions.
P wave. 1. a longitudinal earthquake wave that travels through the interior of the earth and is usually the first conspicuous wave to be recorded by a seismograph. Also called primary wave. Compare L wave, S wave. The P wave is admitted to be the wave of auricular contraction. p wave.
On a seismogram, the earthquake origin time can be determined by the P wave arrival. P Wave. P (Primary) waves are a type of body wave. A body wave is a seismic wave that moves through the interior of the Earth, as opposed to surface waves that travel near the Earth's surface.P and S waves are body waves. Each type of wave shakes the ground in different ways.n a seismogram, the earthquake origin time can be determined by the P wave arrival. P Wave. P (Primary) waves are a type of body wave. A body wave is a seismic wave that moves through the interior of the Earth, as opposed to surface waves that travel near the Earth's surface.