Survey Identifier: SERA02WT


Format Acronym: MGD77
Data Center File Number: 15040204
Parameters Surveyed Code: 55533
File Creation Date (yyyymmdd): 19
Source Institution: SCRIPPS INSTITUTION OF OCEANOGRAPHY
Country: USA
Platform Name: R/V T.WASHINGTON
Platform Type Code: 1
Platform Type: SHIP
Chief Scientist(s): J.HILDEBRAND, S.WEBB
Project: SERA LEG 2
Survey Departure Date (yyyymmdd): 19910505
Port of Departure: MANZANILLO, MEXICO
Survey Arrival Date (yyyymmdd): 19910521
Port of Arrival: SAN DIEGO, CALIFORNIA
Navigation Instrumentation: GPS,AUTO LOG GYRO+2D DOPPLER SPD
Geodetic Datum/Position: LINEAR INTERP.BETWEEN ADJACENT FIXES
Bathymetry Instrumentation: SEABEAM VERTICAL BEAM (2&2/3DEG)&3.5KHZ
Additional Forms of Bathymetric Data: ANAL.REC,35MM FILM,DIGITAL MAG. TAPE
Magnetics Instrumentation: GEOMETRICS MAGNETOMETER MOD G-801/3
Additional Forms of Magnetics Data: ANAL.REC,35MM FILM,DIGITAL MAG. TAPE
Gravity Instrumentation: BELL BGM-3 METER
Additional Forms of Gravity Data: DIGITAL MAG TAPE
Seismic Instrumentation: 6 GUN AIRGUN ARRAY
Formats of Seismic Data: ANALOGUE RECORDS,35MM FILM
Topmost Latitude of Survey: +33
Bottommost Latitude: +09
Leftmost Longitude: -118
Rightmost Longitude: -102
General Digitizing Rate of Bathymetry: 010
General Sampling Rate of Bathymetry: 1PING IN H2O
Assumed Sound Velocity: 15000
Interpolation Scheme: 1 MINUTE AVERAGES EXTRACTED FROM SEABEAM VERTICAL BEAMS
General Digitizing Rate of Magnetics: 010
General Sampling Rate of Magnetics: 06
Reference Field Code: 88
Reference Field: IGRF-1990
Method of Applying Residual Field: LIN.INTERP.POINTS WITHIN ONE DEGREE SQUARE
General Digitizing Rate of Gravity: 010
General Sampling Rate of Gravity: 01
Theoretical Gravity Formula Code: 3
Theoretical Gravity Formula: IAG SYSTEM 1967
Reference System Code: 3
Reference System: SYSTEM IGSN 71
Corrections Applied: EOTVOS AND METER DRIFT
Departure Base Station Gravity: 9785815
Departure Base Station Description: OCEANOGRAPHIC INST. MANZANILLO
Arrival Base Station Gravity: 9795355
Arrival Base Station Description: SIO MAR FAC PIER, SAN DIEGO
Additional Documentation: PROCESSED BY GEOLOGICAL DATA CENTER, SCRIPPS INSTITUTION OF OCEANOGRAPHY, DEPTHS CORRECTED FOR 5 METER SHIP DRAFT. GPS PRESENT 23+ HRS/DAY, NAVIGATION: DR CSE/SPD BETWEEN 10 MINUTE INTERVAL GPS FIXES, GRAVITY: 1 SEC METER COUNTS FILTERED WITH 25 POLE FILTER WITH 148 SEC DELAY. FREE AIR ANOMALY SPIKES PRESENT BECAUSE SAME FILTER NOT USED FOR NAV. NGDC has multibeam bathymetric data for this cruise, however the tracklines, found here in GEODAS may not exactly correspond to the multibeam data.
Number of Data Records: 23145

Min/Max Data Record:
Date: 1991 05 05
Latitude: +9.14372
Longitude: -117.24177
Bathymetry, 2- Way Traveltime: 002293
Bathymetry, Corrected Depth: 172.0
Magnetics Total Field, 1st Sensor: 356870
Magnetics Residual Field: -08295
Observed Gravity: 9781110
Free-Air Anomaly: -1185

Min/Max Data Record:
Date: 1991 05 22
Latitude: +32.70683
Longitude: -102.95809
Bathymetry, 2- Way Traveltime: 064587
Bathymetry, Corrected Depth: 4858.0
Magnetics Total Field, 1st Sensor: 399450
Magnetics Residual Field: +07605
Observed Gravity: 9795424
Free-Air Anomaly: +0894