Annual Report 2000 - WIT

198
Time (ms)
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HIKALISTO: Shotpoint Se1
sourcetype: Hilti, line: shaft, unfiltered
trace-normalization, wiggle: 2 (units/cm), polarity:
alcove
appearance: red: low-frequency (S)
black: high-frequency (P)
810 815 820 825 830 835 840 845 850
Elevation above sea level (m)
Time (ms)
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HIKALISTO: Shotpoint Se1
sourcetype: Hilti, line: shaft, filter: 100-200-500-800
trace-normalization, wiggle: 2 (units/cm), polarity:
alcove
810 815 820 825 830 835 840 845 850
Elevation above sea level (m)
HIKALISTO: Shotpoint Se1
sourcetype: Hilti, line: shaft, filter: 1200-1500-5000-6000
file: Se1_Bohrloch
file: shaft_Se1_100-200-500-800
S
S dyke
2
trace-normalization, wiggle: 2 (units/cm), polarity:
4
6
P
8
Time (ms)
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P dyke
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810 815 820 825 830 835 840 845 850
Elevation above sea level (m)
file: shaft_Se1_1200-1500-5000-6000
Figure 9: Comparison of different filters for a shot recorded by the hydrophone cable
within the shaft. The unfiltered data (upper figure) show both P- and S-wave energy.
Lowpass filtering (middle figure) enhances S-wave energy, whereas S-wave energy can
be removed by highpass filtering the data (lower figure).