MOISE: A pilot experiment towards long term sea-floor geophysical observatories

Romanowicz, Barbara; Stakes, Debra S.; Montagner, J. P.; Tarits, Pascal; Uhrhammer, Robert A.; Begnaud, M. L.; Stutzmann, E.; Pasyanos, Michael E.; Karczewski, J. F.; Etchemendy, S.; Neuhauser, D. S.

doi:10.1186/bf03352188

Cited by 44 publications

(24 citation statements)

References 15 publications

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“…In particular, sensors can be deployed at the seafloor; they can be partially or completely buried in the sediment layer (Romanowicz et al, 1998;Collins et al, 2001;Stephen et al, 2003;Shinohara et al, 2006;Duennebier and Sutton, 2007) or ▴ Figure 2. Dominant sources of signal in the seismic spectrum are indicated in their corresponding frequency bands, spanning from infragravity waves > 25 s (< 0:04 Hz) to local seismicity 0.05-0.25 s (4-20 Hz).…”

Section: Sensor Type and Installation Proceduresmentioning

confidence: 99%

Seafloor Seismic Noise at Central Eastern Mediterranean Sites

Monna

Frugoni

et al. 2014

Seismological Research Letters

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Section: Sensor Type and Installation Proceduresmentioning

confidence: 99%

Seafloor Seismic Noise at Central Eastern Mediterranean Sites

Monna

Frugoni

et al. 2014

Seismological Research Letters

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“…Previous experiments [e.g., Sutton et al, 1981;Duennebier and Sutton, 1995] showed that it is important to minimize water flow around the seismometer. To prevent noise from water circulation within the caisson, and similarly to the previous temporary MOISE experiment [Romanowicz et al, 1998], tiny glass beads (0.8 mm diameter) were poured into the PVC caisson to completely cover the pressure vessel. The seismometer package is now buried at least 10 cm beneath the seafloor.…”

Section: Instrument Testing and Deploymentmentioning

confidence: 99%

Identifying and removing noise from the Monterey ocean bottom broadband seismic station (MOBB) data

Dolenc¹,

Romanowicz²,

Uhrhammer³

et al. 2007

Geochem Geophys Geosyst

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[1] When compared to quiet land stations, the very broadband Monterey ocean bottom seismic station (MOBB) shows increased long-period background as well as signal-generated noise. Both sources of noise are unavoidable in shallow ocean bottom installations, and postprocessing is required to remove them from seismic observations. The long-period background noise observed for periods longer than 20 s is mainly due to infragravity waves and ocean currents. The shorter-period signal-generated noise, on the other hand, is due to reverberations of the seismic waves in the shallow sedimentary layers as well as in the water layer. We first present the steps that were taken prior to and during the instrument deployment to minimize instrument generated noise as well as to avoid noise due to water flow around the instrument. We then present results from two postprocessing methods that can be used to remove the long-period background noise, which both utilize the ocean bottom pressure signal locally recorded on a differential pressure gauge (DPG). One consists of subtracting the locally recorded ocean bottom pressure from the vertical seismic acceleration signal. In this case the frequency-independent scale factor is linearly estimated from the data. The other one makes use of the transfer function between the vertical seismic and pressure signal to predict the vertical component deformation signal. The predicted signal is then removed from the vertical seismic data in either frequency or time domain. We also present two methods that can be used to remove the signal-generated noise. One employs the empirical transfer function constructed from MOBB data and nearby land station data that do not show the signal-generated noise. The other one uses a synthetic transfer function computed by modeling the response of shallow layers at the MOBB location. Using either of the two transfer functions, most of the signal-generated noise can be removed from the MOBB data by deconvolution.Components: 6406 words, 13 figures.Keywords: ocean bottom seismology; seismic noise; ocean bottom seismic stations.

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“…The MOBB is a continuously operated broadband seismic station and is considered the first step toward extending the Berkeley Digital Seismic Network (BDSN) westward of the Pacific‐North America plate boundary. It follows from the experience gained previously during the 3‐monthlong MOISE deployment in 1997, which was located about 10 km to the west [ Romanowicz et al , 1998; Stutzmann et al , 2001].…”

Section: Introductionmentioning

confidence: 99%

Observations of infragravity waves at the Monterey ocean bottom broadband station (MOBB)

Dolenc¹,

Romanowicz²,

Stakes

et al. 2005

Geochem Geophys Geosyst

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[1] Infragravity waves can be observed at the 1000 m deep ocean bottom broadband seismic station MOBB on stormy as well as quiet days. When compared to the energy of the short-period ocean waves recorded at the local buoys, infragravity waves in the longer than 20 s period band are found to be mainly locally generated from shorter-period waves. Two types of modulation of the infragravity signal are observed. First, the entire infragravity band signal is modulated in-phase with tides, possibly as a result of the nonlinear exchange of energy between the short-period waves and tidal currents. Second, a longer-period modulation of the infragravity signal is observed and is best correlated with the energy of the 14 s period ocean waves. This correlation indicates that the mechanism of generation of double frequency microseisms and infragravity waves are likely strongly related. Previously recorded data during the Oregon ULF/VLF experiment at 600 m water depth also indicate that infragravity waves are primarily locally generated.

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MOISE: A pilot experiment towards long term sea-floor geophysical observatories

Cited by 44 publications

References 15 publications

Seafloor Seismic Noise at Central Eastern Mediterranean Sites

Seafloor Seismic Noise at Central Eastern Mediterranean Sites

Identifying and removing noise from the Monterey ocean bottom broadband seismic station (MOBB) data

Observations of infragravity waves at the Monterey ocean bottom broadband station (MOBB)

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