134. Earthquakes


See also 179. GEOLOGY .

bathyseism
an earthquake occurring at very deep levels of the earth.
bradyseism
the slow upward and downward motion of the earth’s crust. — bradyseismic , adj .
cataclysm
any major disaster, as an earthquake, flood, etc. See also 414. WATER . — cataclysmal , adj .
coseism
a line drawn about an epicenter through all points affected by the same seismic shock. — coseismic , adj .
epicenter
a point on the earth’s surface directly above the true center of the seismic disturbance from which the shock waves of an earthquake seem to radiate.
macroseism
a major earthquake. — macroseismic , adj .
megaseism
a violent earthquake. — megaseismic , adj .
microseism
an almost imperceptible earth tremor caused by a violent sea storm or an earthquake and detected only by a microseismometer. — microseismic , adj .
seismicity
the intensity, frequency, and distribution of earthquakes in a specific area.
seismism, seism
an earthquake. — seismic , adj .
seismogram
the record of an earthquake’s vibrations and intensity made by a seismograph.
seismograph
any of various devices for measuring and recording the vibrations and intensities of earthquakes. — seismographer , n . — seismographic, seismographical , adj .
seismography
1 . the scientific measuring and recording of the shock and vibrations of earthquakes.
2 . seismology.
seismology
the branch of geology that studies earthquakes and their effects. Also seismography . — seismologist , n . — seismologic, seismological , adj .
seismometer
a special seismograph equipped to measure the actual movement of the ground. — seismometry , n . — seismometric , adj .
teleseism
an earthquake that occurs in a part of the world far away from a recording station. — teleseismic , adj .
tromometer
an instrument for detecting or measuring very slight earth tremors.

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