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Pig. 3.3
Fig. 3.4
Pig. 3.5
Fig. 3.6
Pig. 3.7
Fig. 3.8
Fig. 3.9
General system configuration and recording scheme for VHS
output, HSF and DCF radio time onto two Store 14s operating
at different record levels.
Amplitude response to the Geospace HP-24H1 hydrophone used
in the BGS Vertical Hydrophone String (VHS). (3900 Q; 45%)
Schematic representation of the deployment method used for
the BGS Vertical Hydrophone String.
Block diagram of the recording and digital systems of the
BGS Sea Bottom Package. The digital system is contained in
the pressure tube which rests on the sea-bed and is cable
linked to a surface recorder. Outputs selected in this
experiment were three-component digital seismic
acceleration and velocity and FH hydrophone. The digital
data on channel 13 consists of multiplexed three-component
seismic acceleration on Deck 1 and seismic velocity on
Deck 2. The hydrophone output is FH recorded. HSF and DCF
radio time are recorded on both decks.
The amplitude-frequency response of the BGS Sea Bottom
Package Teledyne Geotech S-500 accelerometers and Graseby
Dynamics 770/401 PZT-4 hydrophone system. The S-500
accelerometer response is given for both velocity and
acceleration output. Vhere only the solid line is shown it
is common to all three responses.
Plan of the system arrangement at the BGS listening
station.
The amplitude-frequency response of the PUSS geophone and
hydrophone system. The geophone response is identical for
Z, X and Y components. The geophone and hydrophone are
identically low pass filtered. Vhere only the solid line
is shown it is common to both responses.
Fig. 3.10 The phase-frequency response of the PUSS geophone and
hydrophone system.
86
Fig. 4.1 Ribbon diagram illustrating the distribution of recording
windows programmed into the PUSSes.
87
Fig. 4.2 Plan view of PUSS deployment procedure at site 3. 88
Fig. 6.1 Geological cross-section interpreted between the shot-point
(57°06.984'N 00045.030'V) and Tentsmuir (THA at 56°24.456'N
02°48.72'E).
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Pig. 7.1 Hap showing sites in the U.K. and Eire known to have
detected the 4500lb explosion.
90
Fig. 7.2 Plot of travel time against range for all picked arrivals. 91
(45001b explosion)
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