Guralp Systems Scream User Manual
Page 132
Scream! 4.5
3. Whilst holding down the shift-key (
), drag a box across
the streams. The selected data will be highlighted.
Alternatively, drag with
to select two streams (see “Paused
4. When you release the mouse button, a menu will pop up
showing the extensions available.
5. Click on the name of the extension you want to run. The
standard Scream! Package (depending on installer) includes a
number of useful extensions:
ART Analysis Package : Güralp Systems' suite of tools for strong
motion analysis. See the separate ART documentation
(MAN-SWA-0003) for full details of this package.
PSD in Velocity Units and PSD in Acceleration Units : These
extensions produce instant power spectral density plots of the
selected time series.
Sine Wave Calibration, Step Calibration and Broadband Noise
Calibration : These extensions help you to calibrate sensors
using an input sinusoidal, step or pseudo-random noise signal.
These signals can be generated by Güralp Systems DM24 and
CD24 digitisers, allowing you to calibrate sensors quickly and
easily.
Relative Orientation : This extension applies the
Güralp-Blacknest correlation method to determine the
orientation of an instrument (usually a borehole instrument). It
uses coherence techniques to estimate the angle between the
horizontal components of two sensors, where one is rotated
with respect to the other.
132
Issue K