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3D Multichannel Seismic
Data Acquisition System
Boomer and P-cable system
Pacific Gas and Electric Company
Started on Dec. 6, 2011, and ended on Oct. 5, 2012.
Reprocessed boomer 3D seismic-reflection data of field activity P-04-11-CC, in San Luis Obispo Bay, offshore of Pismo Beach, central California, 2011-12-06 to 2012-10-05.
This data release includes boomer 3D seismic data collected in 2012 within San Luis Obispo Bay, central California as part of PG&E’s Central California Seismic Imaging Project (Pacific Gas and Electric Company [PG&E], 2014). The U.S. Geological Survey conducted advanced post-processing on the data to remove noise and improve overall image quality, following the workflow described by Kluesner and Brothers, 2016.
Following the generation of the cleaned 3D volume, data were exported using the OpendTect software package. The 3D data volume is in SEG-Y format and are provided here.
Any use of trade, product, or firm names are for descriptive purposes only and does not imply endorsement by the U.S. Government.
Kluesner, J. W., Brothers, D. S., and Sliter, R. W., 2017, Reprocessed boomer 3D seismic-reflection data of field activity P-04-11-CC, in San Luis Obispo Bay, offshore of Pismo Beach, central California, 2011-12-06 to 2012-10-05: U.S. Geological Survey data release, doi:10.5066/F7N29VWM
Central California, Pismo Beach, San Luis Obispo Bay
Processed Data Classes
Data File Formats
Seismic Data Provenances
Digitally Acquired Digital SEG
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Seismic data were acquired using a triple-plate boomer source operated at 1.75 kJ and the P-Cable streamer system. The 3D data show a frequency range of approximately 100-700 Hz, with a dominant frequency of 200-225 Hz (PG&E, 2014). The P-Cable system consisted of 14, 8-channel digital streamers with 6.25 m hydrophone group spacing (Nishenko and others, 2012; Ebuna and others, 2013). Data were sampled at 0.25 ms with a record length of 0.75 s two-way travel-time. Seismic processing steps conducted by Fugro Consultants included quality control, tidal corrections, velocity analysis, NMO correction, stacking, surface related multiple elimination, deconvolution, crossline statics, and pre-stack migration (Fugro Consultants Inc., 2012; PG&E, 2014). However, upon public release and inspection by the USGS, significant high-frequency noise was observed, limiting the interpretation of imaged fault structures (Kluesner and Brothers, 2016).
The publically released 3D seismic data were downloaded and analyzed by the USGS and a post-stack data-conditioning workflow was designed to reduce noise and enhance the overall quality. The data conditioning workflow used on this dataset followed that of Kluesner and Brothers, 2016. Initially, data were imported into the OpendTect software package and a dip-steering volume was calculated using a 1x1x1 (inline, crossline, sample interval) calculation window. Following dip-steering calculation a median filter was applied with a 1x1x1 stepout, resulting in a smoothed 3D volume of dip and azimuth information for all seismic events. The dip-steered median filter was then applied to the data between 0 and 0.5 s TWTT, with a 1x1 (inline, crossline) stepout. Filtered results were then subtracted from the original data to produce a volume with significant noise suppression. Both random and apparent acquisition noise were suppressed, while enhancing laterally continuous events.
Following generation of the cleaned data volume the results were exported as a new 3D SEG-Y file using the OpendTect software package.
World Geodetic System 1984 (WGS84)
Ebuna, D. R., T. J. Mitchell, P. J. Hogan, S. Nishenko, and H. G. Greene, 2013, High-resolution offshore 3D seismic geophysical studies of infrastructure geohazards: 26th Symposium on the Application of Geophysics to Engineering and Environmental Problems, 311-320, http://www.proceedings.com/18180.html.
Fugro Consultants Inc., 2012, Software validation of Uniseis and 3D data qualification of 2010 - 2011 high-resolution marine survey data, Offshore Diablo Canyon Power Plant, Central Coastal California Seismic Imaging Project: Fugro Consultants Inc., No. PGEQ-PR-03 (Rev0), FSI Project No. 2011-4493, 1-67.
Kluesner, J. W., and Brothers, D., 2016, Seismic attribute detection of faults and fluid pathways within an active strike-slip chear zone: New Insights from high-resolution 3D P-Cable seismic data along the Hosgri Fault, offshore California: AAPG/SEG Interpretation, 4, 1, doi: 10.1190/INT-2015-0143.1.
Nishenko, S., P. Hogan, and R. Kvitek, 2012, Seafloor mapping for earthquake, tsunami hazard assessments: Sea Technology, 53, 15-20.
Pacific Gas and Electric Company (PG&E), 2014, Offshore low-energy seismic reflection studies in Estero Bay, San Luis Obispo Bay, and Point Sal Areas: PG&E Technical Report, GEO.DCPP.TR.14.02, http://www.pge.com/includes/docs/pdfs/safety/systemworks/dcpp/report/Ch3.GEO.DCPP.TR.14.02_R0_txt.w.ITR.pdf.
|Area covered: 41 square kilometers|
|Field Activity Identifiers||P-04-11-CC|
|Horizontal Datum||World Geodetic System 1984|