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General Information

Data Type

Singlechannel Seismic

Data Acquisition System

Sparker and Streamer

Contributor

Pacific Coastal and Marine Science Center

Dates

Started on Sept. 12, 2011, and ended on Sept. 26, 2011.

Number of Tracklines

177

Distance Shot

922 km

Description

Minisparker seismic-reflection data of field activity B-05-11-CC, from Point Sur to Morro Bay, offshore central California, 2011-09-12 to 2011-09-26

Purpose

This data release includes marine geophysical data collected on cruise B-05-11-CC between Point Sur and Morro Bay, California. The overall goal of this research is to understand the shallow geologic framework of this area as a contribution to the California Seafloor Mapping Program (Johnson and others, 2017). Particular focus is on mapping active faults and documenting the distribution and thickness of offshore, unconsolidated sediment.

Approximately 700 km of single-channel, seismic-reflection data between Point Sur and Morro Bay were collected during the cruise. Seismic profiles were collected at 1 km line spacing between Point Sur and Piedras Blancas, crossing the Hosgri-San Gregorio fault system 60 times. Data were also collected to the south on the south flank of Piedras Blancas (south of San Simeon) crossing the Hosgri-San Gregorio fault 13 times at 800 m line spacing. Farther south, additional data were collected offshore of Morro Bay with a focus on crossing the Los Osos fault zone. Data collected in the southern two areas overlap with and supplement data available in Sliter and others (2009).

Seismic-reflection data were collected using a minisparker system that creates an acoustic signal by discharging an electrical pulse between electrodes and a ground that generates a frequency spectrum roughly between 200 and 1600 Hz. At boat speeds of 4 to 4.5 nm/hour, seismic traces were collected roughly every 1 to 2 meters. Water depths were between 20 m and 600 m. Acoustic pulses were generated at 0.5-second intervals on profiles where maximum depth was about 300 m; a 1-second interval was used on the deeper water profiles. Standard SEG-Y files were generated using a Triton Subbottom Logger (SBL). Seismic data processing was accomplished using Sioseis, a public-domain software developed at Scripps Institute of Oceanography (part of the University of California at San Diego), and SeismicUnix developed at the Colorado School of Mines. The processing of these data consisted of a bandpass filter, mute function, automatic gain control, water bottom detect, swell correction, and scaling/plotting. Both raw data in SEG-Y format and processed (corrected) data are provided here.

Notes

Suggested Citation: Johnson, S.Y., Hartwell, S.R., Sliter, R.W., and Beeson, J.W., 2017, Minisparker seismic-reflection data of field activity B-05-11-CC, from Point Sur to Morro Bay, offshore central California, 2011-09-12 to 2011-09-26: U.S. Geological Survey data release, doi:10.5066/F7K35S44

Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.

Geographic Features

Central California

Dataset Information

Processed Methods

Seismic Reflection

Processed Data Classes

Other

Data File Formats

SEG-Y

Embedded Navigation

Yes

Data Class

Compilation

Seismic Data Provenances

Digitally Acquired Digital SEG, Digital SEG

Data Media

Online

Notes

To download full dataset click on "Download". To download individual files click on "View Contents"

Processing

Seismic-reflection data were collected using a minisparker system that creates an acoustic signal by discharging a 500-Joule, high-voltage electrical pulse between electrodes and a ground that generates a frequency spectrum roughly between 200 and 1,600 Hz. At boat speeds of 4 to 4.5 nm/hour, seismic traces were collected roughly every 1 to 2 meters. The data were recorded on a 15-m-long hydrophone streamer in standard SEG-Y 32-bit floating-point format with Triton Subbottom Logger (SBL) software that merges seismic-reflection data with differential GPS navigation data.

SEG-Y header data were normalized using the "header" Sioseis processes, and a band pass filter was applied. Next, each SEG-Y file was displayed and up to 16 water-bottom time/shot-point pairs where recorded to guide the automated water-bottom picker used to mute the water column. Finally, a swell filter was applied to the data, and the results were exported as a new SEG-Y file.

Navigation Information

Datum

World Geodetic System 1984 (WGS84)

Related Publications

Johnson, S.Y., Cochrane, G.R., Golden, N.E., Dartnell, P., Hartwell, S.R., Cochran, S.A., and Watt, J.T., 2017, The California Seafloor Mapping Program - Providing science and geospatial data for California's State Waters: Ocean and Coastal Management, v. 140, p. 88-104, http://dx.doi.org/10.1016/j.ocecoaman.2017.02.004.

Sliter, R. W., Triezenberg, P. J., Hart, P. E., Watt, J. T., Johnson, S.Y., and Scheirer, D. S., 2009, High-resolution seismic reflection and marine magnetic data along the Hosgri Fault Zone, central California: U.S. Geological Survey Open-File Report 2009-1100, https://pubs.usgs.gov/of/2009/1100/.

Location

Tracklines 177 total

Name Length (km) First SP Last SP First CDP Last CDP
BSS-01 6 1 3,536 1 3,536
BSS-02 1 1 718 1 718
BSS-03 6 1 3,756 1 3,756
BSS-04 1 1 750 1 750
BSS-05 7 1 4,478 1 4,478
BSS-05A 1 1 813 1 813
BSS-06 7 1 4,533 1 4,533
BSS-07 1 1 308 1 308
BSS-08 8 1 2,479 1 2,479
BSS-09 1 1 501 1 501
BSS-10 8 1 2,571 1 2,571
BSS-100 7 1 2,453 1 2,453
BSS-101 1 1 309 1 309
BSS-102 6 1 2,216 1 2,216
BSS-103 6 1 1,852 1 1,852
BSS-104 1 1 331 1 331
BSS-105 6 1 1,855 1 1,855
BSS-106 1 1 384 1 384
BSS-107 6 1 2,076 1 2,076
BSS-107A 0 1 85 1 85
BSS-108 1 1 271 1 271
BSS-109 6 1 2,153 1 2,153
BSS-11 1 1 401 1 401
BSS-110 9 1 2,903 1 2,903
BSS-111 1 1 339 1 339
BSS-112 9 1 2,841 1 2,841
BSS-113 1 1 408 1 408
BSS-114 9 1 2,981 1 2,981
BSS-115 1 1 333 1 333
BSS-116 9 1 2,872 1 2,872
BSS-117 1 1 399 1 399
BSS-118 8 1 2,592 1 2,592
BSS-119 7 1 2,316 1 2,316
BSS-12 7 1 2,479 1 2,479
BSS-120 1 1 255 1 255
BSS-121 8 1 3,107 1 3,107
BSS-122 1 1 312 1 312
BSS-123 7 1 2,642 1 2,642
BSS-124 13 1 8,286 1 8,286
BSS-125 18 1 10,962 1 10,962
BSS-126 6 1 4,354 1 4,354
BSS-127 1 1 604 1 604
BSS-128 6 1 4,001 1 4,001
BSS-129 1 1 566 1 566
BSS-13 7 1 2,542 1 2,542
BSS-130 5 1 3,777 1 3,777
BSS-131 7 1 5,400 1 5,400
BSS-132 1 1 857 1 857
BSS-133 7 1 2,635 1 2,635
BSS-134 1 1 331 1 331
BSS-135 8 1 2,640 1 2,640
BSS-136 7 1 2,048 1 2,048
BSS-137 14 1 9,637 1 9,637
BSS-138 9 1 5,378 1 5,378
BSS-139 6 1 3,488 1 3,488
BSS-140 2 1 1,008 1 1,008
BSS-140A 8 1 5,295 1 5,295
BSS-141 6 1 4,600 1 4,600
BSS-142 1 1 681 1 681
BSS-143 6 1 3,850 1 3,850
BSS-144 21 1 14,076 1 14,076
BSS-145 12 1 8,219 1 8,219
BSS-146 8 1 2,800 1 2,800
BSS-147 15 1 5,191 1 5,191
BSS-148 11 1 3,663 1 3,663
BSS-149 12 1 4,255 1 4,255
BSS-15 1 1 391 1 391
BSS-16 8 1 2,417 1 2,417
BSS-17 0 1 125 1 125
BSS-18 9 1 2,668 1 2,668
BSS-19 2 1 664 1 664
BSS-20 8 1 2,708 1 2,708
BSS-21 8 1 2,818 1 2,818
BSS-22 8 1 2,501 1 2,501
BSS-23 1 1 436 1 436
BSS-24 7 1 2,453 1 2,453
BSS-25 1 1 393 1 393
BSS-26 7 1 2,033 1 2,033
BSS-27 7 1 2,453 1 2,453
BSS-28 1 1 401 1 401
BSS-29 7 1 2,338 1 2,338
BSS-30 1 1 343 1 343
BSS-31 7 1 2,597 1 2,597
BSS-32 8 1 2,638 1 2,638
BSS-33 1 1 356 1 356
BSS-34 8 1 2,981 1 2,981
BSS-35 1 1 341 1 341
BSS-36 7 1 2,352 1 2,352
BSS-37 1 1 252 1 252
BSS-38 7 1 2,583 1 2,583
BSS-39 7 1 2,099 1 2,099
BSS-40 1 1 359 1 359
BSS-41 7 1 2,344 1 2,344
BSS-42 1 1 346 1 346
BSS-43 7 1 2,275 1 2,275
BSS-44 1 1 286 1 286
BSS-45 6 1 2,270 1 2,270
BSS-46 1 1 357 1 357
BSS-47 6 1 2,116 1 2,116
BSS-48 1 1 156 1 156
BSS-49 9 1 6,247 1 6,247
BSS-51 9 1 6,390 1 6,390
BSS-52 1 1 819 1 819
BSS-53 3 1 2,336 1 2,336
BSS-54 8 1 5,529 1 5,529
BSS-55 1 1 825 1 825
BSS-56 6 1 3,972 1 3,972
BSS-57 1 1 706 1 706
BSS-58 5 1 3,116 1 3,116
BSS-58A 1 1 575 1 575
BSS-59 1 1 841 1 841
BSS-60 6 1 3,880 1 3,880
BSS-61 7 1 4,349 1 4,349
BSS-62 1 1 779 1 779
BSS-63 7 1 4,725 1 4,725
BSS-64 10 361 7,111 361 7,111
BSS-65 1 1 629 1 629
BSS-66 12 1 8,059 1 8,059
BSS-67 1 1 744 1 744
BSS-68 12 1 8,144 1 8,144
BSS-69 12 9,516 7,533 9,516 7,533
BSS-70 1 1 630 1 630
BSS-71 7 1 4,111 1 4,111
BSS-71A 5 1 2,860 1 2,860
BSS-72 5 842 3,166 842 3,166
BSS-72A 2 631 1,395 631 1,395
BSS-72B 2 1 1,215 1 1,215
BSS-73 1 1 483 1 483
BSS-74 1 1 333 1 333
BSS-74A 8 1 5,244 1 5,244
BSS-75 1 1 587 1 587
BSS-76 8 1 5,346 1 5,346
BSS-77 8 1 5,747 1 5,747
BSS-78 1 1 639 1 639
BSS-79 8 1 5,781 1 5,781
BSS-80 1 1 740 1 740
BSS-81 8 1 5,836 1 5,836
BSS-82 1 1 526 1 526
BSS-83 8 1 5,704 1 5,704
BSS-84 1 1 959 1 959
BSS-84A 8 1 5,464 1 5,464
BSS-85 1 1 588 1 588
BSS-86 7 1 4,969 1 4,969
BSS-87 7 1 5,052 1 5,052
BSS-89 7 1 4,466 1 4,466
BSS-90 8 1 2,569 1 2,569
BSS-91 1 1 299 1 299
BSS-92 7 1 2,517 1 2,517
BSS-93 7 1 2,044 1 2,044
BSS-94 1 1 301 1 301
BSS-95 6 1 2,104 1 2,104
BSS-96 6 1 1,860 1 1,860
BSS-96A 1 1 257 1 257
BSS-97 1 1 323 1 323
BSS-98 7 1 2,481 1 2,481
BSS-99 1 1 544 1 544
EBS-01 7 1 5,003 1 5,003
EBS-02 10 1 6,759 1 6,759
EBS-03 4 1 2,803 1 2,803
EBS-04 11 1 6,850 1 6,850
EBS-05 10 1 6,706 1 6,706
EBS-06 5 1 3,064 1 3,064
EBS-07 13 1 8,724 1 8,724
EBS-08 14 1 9,061 1 9,061
SSS-01 3 1 2,125 1 2,125
SSS-02 3 1 2,703 1 2,703
SSS-03 3 1 2,213 1 2,213
SSS-04 4 1 2,690 1 2,690
SSS-05 4 1 2,458 1 2,458
SSS-06 4 1 2,453 1 2,453
SSS-07 3 1 2,118 1 2,118
SSS-08 3 1 2,222 1 2,222
SSS-09 3 1 2,144 1 2,144
SSS-10 3 1 2,251 1 2,251
SSS-11 3 1 1,801 1 1,801
SSS-12 3 1 1,967 1 1,967
SSS-13 3 1 2,255 1 2,255