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USGS Coastal and Marine Geology Program

Field Activity Details for field activity 2021-619-FA

AKA: Sparker testing 2021

Other ID: none

Status: Completed

Organization(s): USGS, Pacific Coastal and Marine Science Center

Funding Program(s): Coastal and marine earthquake, tsunami, and landslide active margin field studies (ZP00EQV)

Principal Investigator(s): Patrick Hart

Affiliate Investigator(s): Jared Kluesner, USGS Dave Foster, USGS

Information Specialist(s): Alicia Balster-gee

Data Type(s): Seismics: Sparker

Scientific Purpose/Goals: Characterization of sparker source level decay with distance and water depth.

Vehicle(s): None

Start Port/Location: Santa Cruz, CA

End Port/Location: Santa Cruz, CA

Start Date: 2021-04-19

End Date: 2021-04-28

Equipment Used: Calibrated single channel phones, Mini sparker

Information to be Derived: Sparker sound levels

Summary of Activity and Data Gathered: Collected calibrated hydrophone sparker source levels at 0 to 4 km offsets at seven sites from 25m to 600 m water depths

Staff: Alicia Balster-gee

Affiliate Staff:



Monterey canyon region

North: 37.09648707 South: 36.72920243 West: -122.47431993 East: -121.81507587


photo of Parke Snavely
Parke Snavely


Balster-Gee, A.F., Baldwin, W.E., and Hart, P.E., 2022, Calibrated marine sparker source amplitude decay versus offset offshore Santa Cruz, California: U.S. Geological Survey data release,


Data Acquired

Survey EquipmentSurvey InfoData Type(s)Data Collected
Calibrated single channel phonesCalibrated hydrophone on RV San Lorenzo used to record sparker source levels deployed from RV Snavely ot distances of ~ 4 kmSparker
Mini sparkerSparker source was deployed from RV Snavely and source levels were recored by a calibrated hydrophone deployed from stationary RV San LorenzoSparker

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