A Novel Marine Mammal Monitoring System Utilizing the Seismic Streamer Spread

Groenaas, Halvor; Frivik, Svein Arne; Melboe, A. S.; Svendsen, Morten Bo Søndergaard

doi:10.3997/2214-4609.20149106

Cited by 1 publication

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“…Laws (2010) uses the work of Southall et al (2007) to estimate the extent of hearing damage zones around a seismic source. Groenaas et al (2011) present a new system for detection of whales during seismic acquisition. In the proposed system, high-frequency hydrophones are used to detect the position of whales in the vicinity of the seismic vessel.…”

Section: Introductionmentioning

confidence: 99%

Repeatability issues of high-frequency signals emitted by air-gun arrays

Landrø¹,

Amundsen

Langhammer

2013

GEOPHYSICS

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Recent field measurements of the acoustic signals generated by marine seismic air-gun arrays showed that the amount of high-frequency signals (above 10 kHz) increased with the size and total volume of the gun array. We found that for frequencies between 10 and 20 kHz, a strong signal is observed 7-14 ms after the main peak of the source signal. We believe that this signal was generated by ghost cavitation. We observed that this signal was significantly stronger than the high-frequency signal generated at the same time as the peak signal occurs within the bandwidth between 10 and 20 kHz. We found that this high-frequency signal was fairly repeatable from one shot to another. By "fairly," we mean that individual high-frequency events were not repeatable; however, the envelope energy of this cascade of events was repeatable from one shot to another. The typical feature of the envelope of the high-frequency signal was that it lasted for approximately 6-7 ms and showed a monotonic increase in amplitude for the first 5-6 ms, followed by a sudden drop. The sea surface reflection coefficient for these high-frequency events seemed to decrease in magnitude as the frequency increased.

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Section: Introductionmentioning

confidence: 99%