Seismology measurement

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strength of seismic waves of an earthquake

thumb|A seismogram being recorded by a seismograph at Weston Observatory (Boston College)|Weston Observatory in Massachusetts thumb|A detail of the seismogram A seismogram is a graph output by a seismograph. It is a record of the ground motion at a measuring station as a function of time. Seismograms typically record motions in three cartesian axes (x, y, and z), with the z axis perpendicular to the Earth's surface and the x- and y- axes parallel to the surface. The energy measured in a seismogram may result from an earthquake or from some other source, such as an explosion. Seismograms can re

longitudinal seismic wave

explore subsurface properties with seismology

product of the shear modulus, area of rupture along the fault, and the average slip

scale used to measure earthquake intensity

measure of wave reflectivity

Seismicity is a measure encompassing earthquake occurrences, mechanisms, and magnitude at a given geographical location. As such, it summarizes a region's seismic activity. The term was coined by Beno Gutenberg and Charles Francis Richter in 1941. Seismicity is studied by geophysicists.

collaboration of the U.S. Geological Survey (USGS) and regional, state, and academic partners

Response of a structure to oscillation

device that generates controlled seismic energy used to perform both reflection and refraction seismic surveys