Ground motion data J Volk

• The first graph is the difference in two sensors 90 meter apart in MINOS hall the data shows the earth tides and also tilting of the floor due to water movement another year of data is need to see if the summer slump is a regular occurrence

• The second slid is the FFT of that data showing the tide and sump pump tests. The peaks for the tides are clearly visible

• The third and fourth graphs are horizontal and vertical seismic measurements taken at the surface at Fermilab. The large spike at 4.6 hz is due to CHL it is seen everywhere on the surface. The data were taken 1.2 kilometers from CHL.

• The 6th and 7th are seismic measurements made in the MINOS hall at at depth of 100 meters. The CHL 4.6 hz line is not apparent. A large spike at 10 and 20 hz is apparent in the vertical it is assumed but not yet tested that this is due to vacuum and LCW systems in the decay tunnel.

11/15/2005 2/15/2006 5/15/2006 8/15/2006 11/15/2006 2/15/2007

-50

0

50

100

150

mic

ro m

eter

s

Date

L3-L0

Difference between two sensors 90 meters apart

Difference between two sensors 90 meters apart in MINOS hall data from December 2005 to March 2007

This shows the tilt in the floorThe spikes are due to monthlySump pump tests

Fast Fourier Transform of difference between two sensor 90 meters apart in MINOS hall

0.000000 0.000005 0.000010 0.000015 0.000020 0.000025 0.000030 0.000035 0.0000400

1

2

3

Frequency (Hz)

Am

plit

ude

L3-L0 evaporation corrected

12.4 hour periodDue to earth tidesMonthly sump

pump tests

Horizontal seismometer measurements of surface at Fermilab (MP8 tunnel)

0 5 10 15 20 250.000

0.001

0.002

0.003

0.004

0.005

0.006

0.007

Frequency (Hz)

Am

plit

ude

Vol

ts

Horizontal FFTMP8 Floor

CHL

Large spike is 4.6 hz due to Central helium liquefier plant

Vertical seismometer measurements of surface at Fermilab (MP8 tunnel)

0 5 10 15 20 250.0000

0.0005

0.0010

0.0015

0.0020

0.0025

Frequency (Hz)

Am

plit

ude

Vol

ts

MP8 Vertical FFT

CHL

Spike at 4.6 hz due to central helium liquefier

Horizontal seismometer measurements MINOS hall

0 2 4 6 8 10 12 14 16 18 20 22 240.000

0.001

0.002

0.003

0.004

0.005

0.006

0.007

Frequency (Hz)

Am

plit

ude

Horizontal MINOS no LCW or fans

Vertical seismometer measurements MINOS hall

0 2 4 6 8 10 12 14 16 18 20 22 24 26 280.00

0.05

0.10

0.15

0.20

0.25

0.30

0.35

Frequency (Hz)

Am

plit

ude

Vol

ts

Vertical MINOS hall no LCW or fans