Bulletin of the Seismological Society of America; February 2006; v. 96; no. 1;
p. 237-257; DOI: 10.1785/0120050052
© Seismological Society of America
Click on image to view larger version.
Figure 2. Graphical interpretation of
Table 1. Dashed lines are
east–west natural frequencies, dashed-dotted lines are
north–south-natural frequencies, all from forced vibration testing. Shaded
area is the likely region of natural frequencies taking into consideration
errors in measurement, caused by unknown shaker weight configuration and weather
conditions for each test, and experimental error. Crosses indicate the actual
time of a forced vibration measurement. Circles indicate the natural frequency
estimated from the strong-motion recording of the event, with the number in
italics giving the peak acceleration recorded for the event
(cm/sec2).
