Earthquake Dialog

General record information can be entered in three input text boxes: Name, Filename, and Description.
A "View" button, which generates a Plot Dialog with three plots showing the acceleration, velocity and displacement records of the current ground motion. The plots reflect the "modified" quantities as will be described next.
A "Read" button starts the File Selection Dialog which allows the user to pick a ground motion file to be read.
Two editable quantities: Amplification and Timescale. Amplification is the amount by which the original record is multiplied before being used. The unchanged and changed records will be referred to as "Original" and "Modified" respectively. The "timescale" is defined as:
dtmodified = dtoriginal / timescale, which leads to
durationmodified = durationoriginal / timescale, assuming all the data points are used
Two lists of properties, one for the original and another for the modified record. The properties are summarized in the following table, which shows whether that quantity can be edited or not:

	Original		Modified
Property Name	Description	Editable	Description	Editable
N	Original number of points read from the file	No	Number of points to be used, could be less or equal to Noriginal	Yes
dt	The assumed time step	Yes	time step size to be used in analysis, will affect duration if changed, as well as the Timescale parameter	Yes
duration	Equal to N x dt, equivalent to defining dt	Yes	Nmodified x dtmodified	No
Units	The assumed units of the input	Yes	Units of analysis, currently only INCH is possible	No
Peak Acceleration	PGA of original record	No	PGA of modified record	Yes
Peak Velocity	PGV based on acceleration record and dtoriginal	No	PGV based on acceleration record and dtoriginal	Yes
Peak Displacement	PGD based on acceleration record and dtoriginal	No	PGD based on acceleration record and dtoriginal	Yes