REP06359

• Permit No: M1997014
• IBM Index Class Name: Report
• Doc Date: 6/6/1997
• Doc Name: GROUND MOTION SURVEY OF THE DEER CREEK CANYON QUARRY
• Media Type: D
• Archive: No

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The instrumentation at the house consisted of a Sprengnether
5-6000 three-component geophone and three MEQ-800-B seismographs.
The 5-6000 geophone contains three orthogonal coils. One coil is
oriented parallel to the direction of the shot (longitudinal)
one perpendicular (transverse) and one vertical. Component
geophones have a natural frequency of 0.5 hz and motor constants
of 5.39 Volts/inch/second for the vertical and transverse com-
ponents and 5.06 V/in/sec for the radial component. The three
MEQ-800-B's were as described above. The 5-6000 geophone has
an internal calibrate coil, allowing this system to be calibrated
for frequency response after the shot was monitored. A graph
of instrument sensitivity as a function of frequency is shown
in Figure A-1.
The instrumentation at the "overhang" consisted of an 5-6000
geophone and a Sprengnether VS-1100 engineering seismograph.
The VS-1100 consists of three component gain-stable amplifiers
and a recording system utilizing light-sensitive paper. The
nominal paper speed is 100 mm/second. Amplifier sensitivity is
flat to velocity in the 2 to 200 hz frequency range and was
operated at 5 in/in/sec to monitor the blast.
A Teledyne RFT 350 accelerograph was deployed at the conveyor.
The RFT-350 accelerograph is a portable, three-component
system with photographic registration of ground accelerations
in the range from 0.001 to 0.25 times the acceleration of
gravity. Each torsion fiber sensor is aligned for sensitivity
to motions along orthogonal axes, vertical, longitudinal and
transverse. The individual accelerometerA have nominal natural
frequencies of 12 to 14 hz and damping of 0.6 critical. Film
recording speeds are nominally 1 cm/sec. Acceleration sensitivi-
ties are approximately 1.9 cm per '~ g for frequencies less than
the natural frequency with 12 db/octave attenuation for higher
frequencies. Depending upon record quality, acceleration
measurements may be convZrted to equivalent velocity estimates,
by assuming sinusoidal motion.
The instrumentation on the ridge consisted of two Mark Products
L-l0A geophones and two MEQ-800-B seismographs. The L-l0A geo-
phones have a natural frequency of'EO hz and motor constants
of 1.25 Volts/inch/second. One geophone was oriented vertically
and the other radially toward the shot. The MEQ-800-B's each
include a gain-stable amplifier with added on attenuation of
60 dH, an integral timing system, and a smoked paper recorder
with a 0.025 mm stylus width and 120 mm/minute nominal recording
speed. Hoth components (radial and vertical) of the system
were electrically independent and operate at gain of
0.24 inch/inch/second.
MICROGEOI'HYSICS