Millikan Movies

3-D Shaking Movies:

M5.4 Big Bear Event - 5sps 22 Feb 2003, 120km distance

M5.4 Big Bear Event - 10sps[slower to run]

M4.8 Yorba Linda Event - 10sps 3 Sept 2002, 40.5km distance

M3.8 Alhambra Event - 20sps 26 Apr 1998, 7km distance
(very high frequency pulse, want to retain higher order modes excited)
Some timeseries data from the event:

E-W channelsAcceleration, and Displacement for GSA, and Floors 0-Roof -
initial response is dominated by 2mode near 4.5Hz (note little participation on 7-8floors),
fundamental mode arrives very much later on in the record
[postscript ACCN], [postscript DISP]

link to page with GSA --> MIK/MillikanArray Transfer Functions for these and other Earthquakes

Hysteresis Loops:

NOTE unless indicated otherwise, all hysteresis plots are:

x-axis: inter-floor displacement --- difference between displacement of floor above and below
y-axis: cumulative force (mass x accn) for ALL floors above (assume mass each floor = 1, mass roof = 0.75)

Excitation	Channel Orientation	Time Length secs	Samples per Sec	Frequency Range Hz
M5.4 Big Bear	E-W	51s (full length)	10	0.7 - 1.3
M5.4 Big Bear	E-W	15s cut with main S-wave energy	40	0.7Hz - 1.3Hz
M5.4 Big Bear	E-W	51s (full length)	10	5s - 5Hz (Nyquist)
M5.4 Big Bear	E-W	20s cut with main S-wave energy	40	5s - 1.4Hz
M5.4 Big Bear***	E-W	51s (full length)	10	0.7 - 1.3Hz
Forced Vibration @ 1.14Hz	E-W (E-W shake)	~6secs	50	~1.1 - ~1.2Hz
M5.4 Big Bear	N-S	51s (full length)	10	1.5Hz - 1.9Hz
M5.4 Big Bear	N-S	15s cut with main S-wave energy	40	1.5Hz - 1.9Hz
Forced Vibration @ 1.67Hz	N-S[West Side] (N-S shake)	~6secs	50	~1.6 - ~1.75Hz

*** : hysteresis loop in this graphic plots accn of floor above vs inter-floor displacement

NOTE:
Big Bear Dataset does not include any data from ground floor.

John Clinton

Last modified: Fri May 9 11:40:43 PDT 2003