Field Activity O199SC

Identifier O199SC
Alternate names O-1-99-SC
Purpose Identify the landslide and earthquake hazards as well as related ground deformation processes that have great potential to impact the social and economic well being of the inhabitants of the Southern California coastal region.
Description Chief Scientist: Bill Normark. Geophysical data (GPS, 12khz, Huntec, airgun, 24channel) of field activity O-1-99-SC in Southern California from 06/05/1999 to 06/17/1999
Location Southern California
Summary Continue surveying (the second of four planned data collection cruises) the coastal zone between Santa Monica and San Diego; MCS and Huntec data will be used to identify the active faults in the nearshore zone and to assess the seismic hazards expected.
Info derived High-resolution multichannel (MCS) and Huntec seismic-reflection profiles to image the faults and to use dating of sediment -core samples to establish timing and rates of movement on the faults.
Comments physical data holdings California continental borderland: Pt Conception to San Dieigo, CA Lines with tags a, b, c, etc. are all planned lines. a, b, etc. were added to the full line name when something in the lab changed during the line (i.e., for mcs, the blue screen of death or some other problem, or for huntec, if the paper ran out or the recording disks ran out). a and b indicators were used independently for mcs and huntec, so they will can not be correlated between the two systems. Once or twice we did the a planned line in two segments on different days (I think 247,247a or 245,245a is one time this happened), but this will show up on with the time indicators. The tags "dl" or "dm" mean dog legs, between planned lines. MCS may have been on during this time, but probably were not recorded. "dm" was used as a,b was noted above. 99l: planned line on the 085 degree or 040 degree trends (Im not sure of the actual orientation of the lines, so dont quote me.) In general (but not every time) MCS was on for these. There are a couple of exceptions. 99n: Huntec-only lines run at night in any orientation. Staff information imported from InfoBank Bill Normark (USGS Western Region) - Chief Scientist Jane Reid (USGS Western Region) - Watchstanding: Navigation & Huntec Ray Sliter (USGS Western Region) - Watchstanding: Mutichannel Seismic Dave Holton (Environmental Careers Organization) - Watchstanding: Navigation & Huntec Larry Kooker (USGS Western Region) - Electronics Technician Fred Payne (USGS Western Region) - Electronics Technician Kevin O'Toole (USGS Western Region) - Mechanical Technician Hal Williams (USGS Western Region) - Mechanical Technician Graham Standen (Geoforce Consultants) - Huntec Specialist Jen Quan (Cascadia Research Collective) - Marine Mammal Observer Annie Douglas (Cascadia Research Collective) - Marine Mammal Observer Tamara Guenther (Cascadia Research Collective) - Marine Mammal Observer Russ Brisendine (F/V North Wind, Inc.) - Ship Captain Jeff Stringer (F/V North Wind, Inc.) - 1st Mate Dave Malsch (F/V North Wind, Inc.) - Engineer Mike Hill (F/V North Wind, Inc.) - Cook Paul Giron (F/V North Wind, Inc.) - 2nd Mate Joe Kelly (F/V North Wind, Inc.) - A/B Non USGS data manager = Christina Gutmacher
Ocean Olympic
Start Redwood City, CA 1999-06-05
End San Diego, CA 1999-06-17
West -119.7704
East -117.23454
North 34.1515
South 32.5517
Activity Geophysical


2885 Mission Street
Santa Cruz, CA95060
(831) 460-7401
Principal investigators Normark, Bill
Crew members
Ray W Sliter
Scientist, Staff
Jane A Reid
Scientist, Staff
Kooker, Larry
Scientist, Staff
O'Toole, Kevin
Scientist, Staff
Payne, Fred
Scientist, Staff
Williams, Hal
Scientist, Staff
Kelly, Joe
Scientist, Staff
Information specialist(s)
Jane A Reid
Specialist, Information
Affiliate staff Dave Holton (Environmental Careers Organization) - Watchstanding: Navigation & Huntec,Graham Standen (Geoforce Consultants) - Huntec Specialist,Jen Quan (Cascadia Research Collective) - Marine Mammal Observer,Annie Douglas (Cascadia Research Collective) - Marine Mammal Observer,Tamara Guenther (Cascadia Research Collective) - Marine Mammal Observer,Russ Brisendine (F/V North Wind, Inc.) - Ship Captain,Jeff Stringer (F/V North Wind, Inc.) - 1st Mate,Dave Malsch (F/V North Wind, Inc.) - Engineer,Mike Hill (F/V North Wind, Inc.) - Cook,Paul Giron (F/V North Wind, Inc.) - 2nd Mate

Data types and categories

Data category: Location-Elevation, Seismics, Sonar, Sampling
Data type: Navigation, Air Gun / Water Gun, Boomer, Multichannel, Single Beam, Geology

Equipment used

Equipment Usage description Data types Datasets
GPS Navigation 5
12khz Single Beam 6
Huntec Boomer 1
24channel Multichannel 4
airgun Air Gun / Water Gun (no data reported)
core Biology, Geology (no data reported)


Datasets produced in this activity

Dataset name Equipment Description Dataset contact
Best file with nav in ArcInfo E00 format GPS Jane A Reid
Global positioning system (GPS) data o-1-99-sc.060 GPS Jane A Reid
Global positioning system (GPS) data o-1-99-sc.061 GPS Provisional best file Jane A Reid
Global positioning system (GPS) data o-1-99-sc.061_degree GPS Jane A Reid
Survey information GPS Jane A Reid
NGDC MGD77 data - bathy 12khz Carolyn Hayashida Degnan
Raw depth (bathymetry) data o-1-99-sc.300 12khz Jane A Reid
Raw depth (bathymetry) data o-1-99-sc.301 12khz Jane A Reid
Raw depth (bathymetry) data o-1-99-sc.302 12khz Jane A Reid
Raw depth (bathymetry) data o-1-99-sc.302_061 12khz Provisional best file Jane A Reid
Survey information 12khz Jane A Reid
Survey information Huntec Jane A Reid
Multichannel data (stack data) 24channel Ray W Sliter
Reprocessed multichannel seismic reflection data 24channel Multichannel seismic (MCS) data were collected by the U.S. Geological Survey (USGS) in June of 1999 in the coastal zone and continental shelf between Los Angeles and San Diego, offshore California (USGS field activity O199SC). In 2021 these data were reprocessed to improve accuracy and resolvability of geologic structures and fault systems of California’s continental margin. Alicia F Balster-gee
Survey information 24channel Jane A Reid

Datasets compiled from multiple sources

Dataset name Equipment Description Dataset contact
Multichannel seismic-reflection data acquired off the coast of southern California - Part A 1997, 1998, 1999, and 2000 24channel Multichannel seismic-reflection (MCS) data were collected in the California Continental Borderland as part of southern California Earthquake Hazards Task. Five data acquisition cruises conducted over a six-year span collected MCS data from offshore Santa Barbara, California south to the Exclusive Economic Zone boundary with Mexico. The primary mission was to map late Quaternary deformation as well as identify and characterize fault zones that have potential to impact high population areas of southern California. To meet its objectives, the project work focused on the distribution, character, and relative intensity of active (i.e., Holocene) deformation along the continental shelf and basins adjacent to the most highly populated areas. In addition, the project examined the Pliocene-Pleistocene record of how deformation shifted in space and time to help identify actively deforming structures that may constitute current significant seismic hazards. The MCS data accessible through this report cover the first four years of survey activity and include data from offshore Malibu coastal area west of Santa Monica, California to the southern survey limit offshore San Diego. The MCS data, which were collected with a 250-m-long, 24-channel streamer used a small gas-injector airgun source. This system provided optimum resolution of the upper 1 to 2 km of sediment for mapping active fault systems. The report includes trackline maps showing the location of the data, as well as both digital data files (SEG-Y) and images of all of the profiles. These data are also available via GeoMapApp ( and Virtual Ocean ( earth science exploration and visualization applications. Ray W Sliter


Samples collected during this field activity