Earthquakes using Engineering Parameters
are many ways of doing this, using a large variety of parameters. Only
a limited number will be discussed here, and these and others can be found
in the text by Kramer, 1996 . These parameters describe characteristics
of the recorded ground motion time history, which fully describes the
ground motion at a particular site.
The most common measures of amplitude are:
Other measures of amplitude include effective acceleration (Newmark and Hall, 1982) and sustained maximum acceleration (Nuttli, 1979).
The frequency content of a ground motion is usually described using some type of spectra such as Fourier, power, or response spectra. Spectral parameters can include predominant period, mean period, bandwidth, central frequency, shape factor, and vmax/amax.
There are also many parameters that describe both amplitude and frequency content. Some of these are:
intensity (insert gif)
The duration of strong ground motion, rather than the duration of the entire time history, is what is of interest to engineers. Here are some common ways of defining this duration: