SVALEX-2005                 

 RV "Håkon Mosby" Seismic Survey 

University of Bergen (UiB)
Dept. of Earth Science (IFG)
Allé gt. 41, N-5007 Bergen, Norway
Tel: (+47) 5558 3600 Fax: (+47) 5558 3660
September 29, 2005 (OM)


Content

  1. Introduction
  2. Navigation data, field logs, geophysical datasets
  3. Processed nav. data, shotpoint map
  4. Gravitymeter: Base readings and gravity ties
  5. Airgun array configuration
  6. Marine seismic streamer configuration

Introduction

The Svalex course covers a broad range of geophysics and geology topics. It's arranged on Svalbard, with lectures on the UNIS campus in Longyearbyen and field trips using vessels "Nordstjernen" and "Håkon Mosby". E-learning is also used - see modules at EAGE "learningGEOSCIENCE" journal web site.

More information on Svalex on the project web page www.svalex.net. Participating departments on Norwegian universities are

This web page provides documentation on the RV "Håkon Mosby" seismic survey.


2. Navigation data, logs, tape status, grav. datasets

Nav data datum,
UTM Zone / CM
Survey Computer
(EIVA) files:
240 ch, 3 km streamer Gravitymeter
Data files
Notes
Shot event files Data logging Log sheet Triacq system logs
WGS84
Zone 33X / 15º

./data/logs-EivaSurveyComputer/

./data/logs-EIVASurveyComputer ./data/logsheets/ ./data/logs-TriAcq/ ./data/gravitymeter/
(data available from week 39/2005)
 

Table 1: Data, log files

Tape log. Click to open web page.

 

3. Processed nav. data, shotpoint map

Offset adjustments:

Distance antenna - source 70 meter
Distance antenna - first active section in streamer 187 meter

Shotpoint map not ready yet.

 

4. Gravitymeter: Basereadings and gravity ties

Establishing new reference stations

An attempt was made to establish two reference stations, marked "Ref. A" and "Ref. B" in the map below. Both are tied to the gravity station on Longyearbyen airport.

Figure 1. Map of new reference stations, Longyearbyen, Svalbard

New reference station, "Ref. A"

Location: Below "bridge" beween red and blue building, as shown below.

Arial view, reference point "A", Longyearbyen, Svalbard

Gravity sensor location, Ref. A

New reference station, "Ref. B" Bykaia, Longyearbyen

Location: Right side of Harbour Office, in front of garage door.

Harbour Office, Bykaia, Longyearbyen, Svalbard
Reference point on the right side of building.

Gravity sensor location, Ref. B

--

Date: 1. september 2005
Gravitymeter used:
LaCoste & Romberg, model G, S/N: G-936

Location  Time [UTC] Counter
reading
Longyearbyen Airport 10:51   6403.02 
10:53 6403.11
10:56 6403.14
 
Ref. B, Bykaia
Longyearbyen
11:05 6405.09
11:09 6405.32
11:12 6405.33

Table 3: New reference Bykaia, measured 1. sep. 2005

Date: 6. september 2005
Gravitymeter used:
LaCoste & Romberg, model G, S/N: G-936

Location  Time [UTC] Counter
reading
Ref. B, Bykaia,
Longyearbyen
08:35   6405.55 
08:37 6405.40
08:39 6405.33
 
Ref. A, "Gamlekaia"
Longyearbyen
08:51 6405.51
08:52 6405.46
08:55 6405.52
 
Longyearbyen Airport 09:06 6402.95
09:09 6402.98
09:12 6402.98
 
Ref. A, "Gamlekaia"
Longyearbyen
09:28 6405.81
09:31 6405.92
09:33 6405.82
 
Ref. B, Bykaia,
Longyearbyen
09:44 6405.19
09:46 6405.33
09:48 6405.31

Table 4: New references Bykaia, "Gamlekaia", measured 6. sep. 2005.

Thanks to G. Landa., Instrumentation Chief onboard RV "Håkon Mosby", for performing these measurements.

 

 Airgun array configuration

String
Gun 1 (ship side)
310 inch3
Gun 2
 240 inch3
Gun 3
 136 inch3
Gun 4
 90 inch3
Gun 5
 60 inch3
 
 Gun 6 (crane, port side)
1200 inch3
 


Total volume:
Gun no.  Volume
[inch3]
1 310
2 240
3 136
4 90
5 60
6 1200
In total

2036

 

6. Marine seismic streamer configuration

Being prepared.