Orientation of the sensors:
CHANNEL |
DEPTH (meters) |
INCLINATION |
AZIMUTH |
| HLZ | 0 | 0 | 0 |
| HLN | 0 | 90 | 0 |
| HLE | 0 | 90 | 90 |
| HL7 | 0 | 0 | 0 |
| HL8 | 0 | 90 | 0 |
| HL9 | 0 | 90 | 90 |
| HL4 | 45 | 0 | 0 |
| HL5 | 45 | 90 | 79 |
| HL6 | 45 | 90 | 349 |
| HL1 | 91 | 0 | 0 |
| HL2 | 91 | 90 | 192 |
| HL3 | 91 | 90 | 102 |
Notes:
Depth is from surface. Inclination is from vertical. Azimuth is clockwise from North.
Blue indicates surface; orientation
determined directly with an error likely less than 3 degrees
Green indicates orientation determined by
tilt of sonde in borehole. Borehole angle is less than 2
degrees as measured by log tool and tilt is likely less than 5 degrees given diameter of
the borehole
sonde.
Red is determined from comparison with surface sensors with known
orientation and with
particle motion from known events. Estimated maximum error is 5 degrees with respect to
the
surface instruments.
Rotated data - corrected to Z,N,E for all instruments
(Hector Mine - Oct 16 1999):
depth (meters) |
instrument |
vertical |
north-south |
east-west |
0 |
FBA |
HL_FBA_0_Z | HL_FBA_0_N | HL_FBA_0_E |
0 |
Wil |
HL_0_Z | HL_0_N | HL_0_E |
45 |
Wil |
HL_45_Z | HL_45_N | HL_45_E |
91 |
Wil |
HL_91_Z | HL_91_N | HL_91_E |
Notes:
Depth is measured from surface. Instrument type is Wilcoxon (Wil) or Kinemetrics FBA (FBA).
Files are 140 seconds long at 100 sample per second and begin before the P wave.
Data have been demeaned. File format is Seismic Analysis Code (SAC) ascii format
(30 line header followed by data). Event: Hector Mine on day 289 of 1999.
Plots.
Hector Mine rotated to radial and tangential
Hector Mine North_South filtered
Hector Mine radial_tangential_filtered
