Guralp Systems ART - Manual (Page 29)

User guide
8. sustained maximum acceleration in selected
acceleration units, which is defined by Nuttli (1979) as
the third (user-defined) highest absolute peak in the
acceleration time-history;
9. slope of Husid plot in selected acceleration units,
which is defined as the slope of the Arias intensity plot
(Husid plot) between user-defined percentages (those
used for calculation of the relative significant
duration) of the total Arias intensity (Bommer et al.,
2004);
10. .Japan Meteorological Agency (JMA) instrumental
intensity, which is defined in
http://www.hp1039.jishin.go.jp/eqchreng/at2-4.htm
(see also Sokolov & Furumura, 2008) based on band-
filtered acceleration time-histories (N.B. JMA
instrumental intensity is usually defined for three
orthogonal components but in ART it is computed for
each component individually);
11. sustained maximum velocity in selected velocity
units, which is defined by Nuttli (1979) as the third
(user-defined) highest absolute peak in the velocity
time-history;
12. absolute uniform duration in seconds, which is the
total time that the square of the ground acceleration
is above the square of the ground acceleration
specified in the ‘Options’ window;
13. relative uniform duration in seconds, which is the total
time that the square of the ground acceleration is
above the proportion specified in the ‘Options’ window
of the square of the PGA;
14. absolute bracketed duration in seconds, which is the
interval between the first and last instants where the
square of the ground acceleration exceeds that
specified in the ‘Options’ window;
15. relative bracketed duration in seconds, which is the
interval between the first and last instants where the
ground acceleration exceeds a proportion (specified in
the ‘Options’ window) of the maximum absolute
acceleration.
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