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5 14<br />

Hydr.<br />

Z<br />

X<br />

y<br />

Hydr.<br />

z<br />

X<br />

y<br />

First arrival 33.8s from start of record<br />

Water wave arrival 52.4s from start of record<br />

2 Clear seismic and water wave arrival<br />

(2) Some periodic interference to signal. Clear<br />

seismic and water wave arrival.<br />

2 Clear water wave arrival, no seismics<br />

2 Clear seismic and water wave arrival<br />

Record length = 120s<br />

First arrival 41.7s from start of record<br />

Water wave arrival 82.9s from start of record<br />

1 Clear water wave arrival, poor signal to noise<br />

ratio.<br />

1 Clear water wave arrival, very weak signal,<br />

spiky noise.<br />

1 Faulty instrument, periodic noise obscures<br />

trace. Fairly clear water wave arrival. No<br />

trace of seismics.<br />

2 Clear seismic and water wave arrival<br />

132

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