Survey Identifier: L1380NP

Format Acronym: MGD77
Data Center File Number: 06050043
Parameters Surveyed Code: 55500
File Creation Date (yyyymmdd): 19870612
Source Institution: USGS Branch of Pacific Marine Geology
Country: United States
Platform Name: Lee
Platform Type Code: 1
Platform Type: SHIP
Chief Scientist(s): Steve Eittreim
Project: Dave Piper
Survey Departure Date (yyyymmdd): 19801118
Port of Departure: LV REDWOOD CITY
Survey Arrival Date (yyyymmdd): 19801211
Port of Arrival: AR REDWOOD CITY
Navigation Instrumentation: SATNAV, LORAN-C, DOPPLER SONAR
Bathymetry Instrumentation: 12KHZ NARROW 1 SEC, 3.5KHZ WIDE 1 SEC
Additional Forms of Bathymetric Data: RECORDER ROLLS
Magnetics Instrumentation: PROTON PRECESSION - GEOMETRICS G-801
Additional Forms of Magnetics Data: ANALOG RECORDS
Gravity Instrumentation: L&R S-53
Additional Forms of Gravity Data: ANALOG RECORDS
Seismic Instrumentation: SINGLE CHANNEL AIR GUN
Topmost Latitude of Survey: +38
Bottommost Latitude: +33
Leftmost Longitude: -145
Rightmost Longitude: -122
General Digitizing Rate of Bathymetry: 44
General Sampling Rate of Bathymetry: 20/SECONDS
Assumed Sound Velocity: 14630
General Digitizing Rate of Magnetics: 729
General Sampling Rate of Magnetics: 04
Magnetic Sensor Tow Distance: 213
Reference Field Code: 04
Reference Field: IGRF-75
Method of Applying Residual Field: LINEAR INTERP. BETWEEN NAV POINTS
General Digitizing Rate of Gravity: 10
General Sampling Rate of Gravity: 15
Theoretical Gravity Formula Code: 2
Theoretical Gravity Formula: INTERNAT, IAG1967
Reference System Code: 3
Reference System: SYSTEM IGSN-71
Corrections Applied: DRIFT CORRECTIONS
Arrival Base Station Gravity: 9688514
Arrival Base Station Description: REDWOOD CITY, CA.
Number of Data Records: 18108

Min/Max Data Record:
Date: 1980 11 18
Latitude: +33.57783
Longitude: -144.29501
Bathymetry, 2- Way Traveltime: 017980
Bathymetry, Corrected Depth: 1337.0
Magnetics Total Field, 1st Sensor: 433993
Magnetics Residual Field: -01945
Observed Gravity: 9787490
Free-Air Anomaly: -7105

Min/Max Data Record:
Date: 1980 12 11
Latitude: +37.81567
Longitude: -122.39189
Bathymetry, 2- Way Traveltime: 077150
Bathymetry, Corrected Depth: 5824.0
Magnetics Total Field, 1st Sensor: 460783
Magnetics Residual Field: +02173
Observed Gravity: 9799999
Free-Air Anomaly: +1599