Guralp Systems ART User Manual

Page 48

ART

The undamped spectra are also computed but are not
displayed due to their limited applicability in engineering
seismology/earthquake engineering. The calculation takes a
few seconds for a normal length time-history. The method
given in Beaudet & Wolfson (1970) is used to calculate the
spectra. The spectra are displayed using the units selected by
the user in the ‘Options’ window and using the other selected
options.

Also shown in this figure (if the ‘Display metadata’ option is
selected in the ‘Options’ window) are the basic earthquake,
waveform and station metadata of the selected time-history.

Multiple time-histories selected
Clicking on this button when multiple time-histories have been
selected calculates and plots the elastic absolute and relative
input energy spectra and their equivalent velocities (e.g.
Chapman, 1999) of the currently selected time-histories for the
damping level specified in the ‘Options’ window and displays
them on the same sub-figures so that they can easily be
compared (see below).

Issue C