GFJ-294 Marine Seismic Field Course

September 2001

University of Bergen (UiB)
Dept. of Earth Science (IFG)
Allé gt. 41, N-5007 Bergen, Norway
Tel: (+47) 5558 3600 Fax: (+47) 5558 3660
14 August 2006 (OM)

The survey was conducted from Sept. 11 to Sept. 24, 2001, onboard University of Bergen research vessel "Haakon Mosby".

1. Data, log files, format descriptions

1.1 Data and log files

#1

Line id.

 #2

Date-time
start
stop

 #3

Log sheet (scanned)

 #4

Nav data
Datum, UTM Zone

  #5

Survey Computer (EIVA) files:
a) Shot event log files
b) Grav/mag data, 10 sec log interval
c) Runlines (endpoint coordinates) 

 #6

Gravitymeter
Data files

 #7

Notes
1 11-sep-2001  20:22
12-sep-2001  10:33		 ./line-1/log-sheet/   ./line-1/EIVA ./line-1/gravitymeter/  
2 12-sep-2001  14:01
12-sep-2001  21:42		 ./line-2/log-sheet/   ./line-2/EIVA/ ./line-2/gravitymeter/  
3 12-sep-2001  21:56
13-sep-2001  00:56		 ./line-3/log-sheet/   ./line-3/EIVA/ ./line-3/gravitymeter/  
4 13-sep-2001  01:16
13-sep-2001  02:36		 ./line-4/log-sheet/   ./line-4/EIVA/ ./line-4/gravitymeter/  
5 13-sep-2001  03:04
13-sep-2001  07:30		 ./line-5/log-sheet/   ./line-5/EIVA/ ./line-5/gravitymeter/  
6 13-sep-2001  08:39
13-sep-2001  15:34		 ./line-6/log-sheet/   ./line-6/EIVA/ ./line-6/gravitymeter/  
11 16-sep-2001  01:26
17-sep-2001  00:39		 ./line-11/log-sheet/   ./line-11/EIVA/ ./line-11/gravitymeter/  
12 17-sep-2001  09:06
18-sep-2001  20:49		 ./line-12/log-sheet/   ./line-12/EIVA/ ./line-12/gravitymeter/  
20 22-sep-2001  10:55
22-sep-2001  21:47		 ./line-20/log-sheet/   ./line-20/EIVA/ ./line-20/gravitymeter/  
21 23-sep-2001  06:25
23-sep-2001  11:41		 ./line-21/log-sheet/   ./line-21/EIVA/ ./line-21/gravitymeter/  
22 23-sep-2001  12:40
23-sep-2001  18:??		 ./line-22/log-sheet/   ./line-22/EIVA/ ./line-22/gravitymeter/  
23 23-sep-2001  20:23
24-sep-2001  03:25		 ./line-23/log-sheet/   ./line-23/EIVA/ ./line-23/gravitymeter/  
24 24-sep-2001  04:30
24-sep-2001  10:23		 ./line-24/log-sheet/   ./line-24/EIVA/ ./line-24/gravitymeter/  
25 24-sep-2001  12:13
24-sep-2001  17:56		 ./line-25/log-sheet/   ./line-25/EIVA/ ./line-25/gravitymeter/ Line aborted due to bad weather.

Table 1: Data, log files

Raw data

 

1.2 Format description Survey Computer (EIVA) log files:

1.2.1 Shot event files

  • File name example: 0120_linjex.log,  where x is the profile number;  "0120" means survey #20 in 2001

  • Description: Shotpoint log files. They also include gravity, magnetometer and normally depth data, but - IMPORTANT - grav data should be taken from the log files generated by the gravity meter.

  • Logging machine: Survey Computer (= EIVA)

  • Logging interval: Each shot point

Shot (= Event) files; format example:

Tid i UTC pos WGS84 UTM sone 32
Event Time Easting Northing St.d. Gyro Dal Dol Kp Data
----------------------------------------------------------------------------------
000001 20:19:27 0645265.93 08712571.46 10.00 226.8 -0398.41 000.56 -00.398 Filtered 0232.70 14624.99 14624.99 2001.00 54519.00 54519.00
000002 20:22:19 0644962.77 08712312.81 09.00 229.3 00000.08 002.25 000.000 Filtered 0238.00 14624.56 14624.56 2001.00 6875.00 6875.00
Start Recording:
000003 20:22:40 0644924.61 08712280.51 09.00 227.7 00050.08 002.66 000.050 Filtered 0239.10 14624.51 14624.51 2001.00 6876.00 6876.00
000004 20:23:01 0644887.17 08712247.47 09.00 227.7 00100.01 002.04 000.100 Filtered 0240.00 14624.45 14624.45 2001.00 54520.00 54520.00


 Field no. 

Example

Parameter

Notes

1

000003

Shot (event) number

 

2

20:22:40

Time

 

3

0644924.61

UTM Easting

 Refered to antenna position in mast.

4

08712280.51

UTM Northing

 Refered to antenna position in mast.

5

09.00

Standard deviation

 

6

227.7

Gyro compass reading

 

7

00050.08

DAL

 = Distance along line [m]

8

002.66

DOL

 = Distance off line [m]

9

000.050

KP

 = Kilometer post

10

Filtered

 

 (check)

11

0239.10

Depth

 From EK500 Echo Sounder

12

52816.00

Magnetometer

 (Length of mag tow fish cable - check!)

13

12683.04

Gravitymeter

 (check - filtered, raw??)

Table 2. Shot (event) file format description.


Logging of depth, gravity- and magnetometer data every 10 seconds; format example:

Tid i UTC pos WGS 84 UTM sone 32
Time;Filtered vessel position: East;North;Lat;Long;gravimeterdata;Magnetometerdata;
20:15:51 11.09.2001; 645632.1110;8712899.1428; 078°24.954311'; 015°30.566050'; 14625.9100; 54511.0000
20:16:00 11.09.2001; 645616.2427;8712886.0626; 078°24.948271'; 015°30.519964'; 14625.8600; 54513.0000
20:16:10 11.09.2001; 645598.7942;8712871.4546; 078°24.941510'; 015°30.469222'; 14625.8100; 54514.0000

NOTE: OCEAN DEPTH EXCEEDING RANGE OF SENSOR, RESULTING IN ERRENOUS READINGS, MIXED WITHIN GRAV-MAG DATA

Field no.

Example

Parameter

Notes

1

20:15:51

Time

 

2

11.09.2001

Date

 

3

645632.1110

UTM Easting

 

4

8712899.1428

UTM Northing

 

5

078°24.954311'

Latitude

 

6

015°30.566050'

Longitude

 

7

14625.9100

Gravity

8

54511.0000

Magnetometer 

Table 3. 10 second interval log file format description.

 

List of SEG-Y data DVDs

List is here

Photo albums

  • Photo album, credit IFG students and M. Vanneste, Department of Geology, University of Tromsø.