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Summary for Field Activity Number 1979-027-FA

Alternate Leg ID: Cruise II, Leg VI; RP-4-SO-79B

Area of Operations: Yakutat Bay, northeast Gulf of Alaska, Alaska, United States, North America, North Pacific

Dates: September 04, 1979 to September 15, 1979

Objectives: Recover 5 OBIPs (Ocean Bottom Instrument Packages) deployed on Leg II. This offshore OBIP array was placed so as to complement the USGS land station network in obtaining magnitude and acceleration data of offshore earthquakes in the northeast Gulf of Alaska.

Type of Activity: Seismic profiling

Information to be derived: seismic data

Summary: Preliminary review of seismic data showed good system operation in 4 of the 5 instruments. Amplitudes were truncated in another but timing and frequency data were still useful. OBIPS consistently detected and recorded seismic displacement about 5 millimicrons at 10 Hz; recorder noise levels preclude meaningful interpretation of events below 40-50 millimicron levels. Eight events were recorded, from 1 to 14 microns, that correlated with 4 OBIPs and the land station network. OBIPs recovered: 5 (5 days of data each).

USGS Project Number: OBIP

Contact: Ray Davis (

Map for Area of Operations :

Map of field activity boundary.

Platform Info:
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