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Last update:
16 May 2014

Title

     OBS SURVEY JULY/AUGUST 2012

     Using RV "HÅKON MOSBY"

By
O.M.
Date
26 September 2014
Version
0.1

1.  INTRODUCTION


An OBS survey will be conducted in the Barents Sea region in the period 28 July - 14 August 2012.

Both Ocean Bottom Seismographs and land based sensors will be deployed. The source consists of marine airguns. The research vessel RV "Håkon Mosby" will be used.


2.  DATA


2.1  Profiles


LINE INFORMATION EIVA SURVEY COMPUTER GPS TIMESTAMPS MINI-STREAMER UKOOA LOG SHEETS COMMENTS
ID SP INT [m] START
SP Date Time [UTC]
Easting Northing (UTM Zone 29W)
END
SP Date Time [UTC]
Easting Northing (UTM Zone 29W)
EVENT FILE 10 SECONDS LOGFILE RAW PROCESSED LOG FILES SEG-Y P1/90 FILES P1/90 QC FILES
- - - - Link Link - - - - - - - -


3.  GRAVITY METER


3.1  Base reading TROMSØ 27 July 2012


  a) Nord-Norsk Kunstmuseum:

     UTC    COUNTS
    ---------------
    15:27   6017.32
    15:29   6017.44
    15:31   6017.83

  b) Tromsø Bunkersdepot, alongside ship:

    Height, water level to quay: 2.8 meter

     UTC    COUNTS
    ---------------
    15:51   6020,47
    15:53   6020,75
    15:55   6021,16

  c) Still reading (also check raw gravity meter files, when they are available).
     NOTE: Ref gravity meter log book: Still readings made earlier that day are not valid as meter was still unclamped.

    -----------------------------------------------------
    DoY     UTC        DG       ST      CC    RAW     TC
    -----------------------------------------------------
    209   18:00:00   14253.8  14237,7   0.0   246    17.1

    (Gravity meter had obviously not reached steady state when these data were taken.
     Assume the ship left harbor shortly afterwards.)

3.2  Base reading Longyearbyen, "Gamlekaien = NorCargo = Bring", 22 August 2012


  a) Still reading:

    -----------------------------------------------------
    DoY     UTC        DG       ST      CC    RAW     TC
    -----------------------------------------------------
    235   16:40:00   14654.0  14653.8   0.0   16.0    0.1


  b) Entry, Governor's Office: ("Syssselmannen, inngang")

     UTC    COUNTS
    ---------------
    17:00   6422.24
    17:02   6422.26
    17:05   6422.23


  c) Quay, "Gamlekaien = NorCargo = Bring":

     h = 2.88 m

     UTC     COUNTS
    ----------------
    17:10   6421.29
    17:14   6421.25
    17:16   6421.29

  d) Still reading:

    -----------------------------------------------------
    DoY     UTC        DG       ST      CC    RAW     TC
    -----------------------------------------------------
    235   17:20:00   14654.0  14653.8   0.0   35.0    0.2
    235   17:45:00   14654.1  14653.8   0.0   -5.0   -0.3

3.3  Base reading Longyearbyen, "Gamlekaien = NorCargo = Bring", 30 August 2012 (SVALEX-2012)


  a) Still reading:

    -----------------------------------------------------
    DoY     UTC        DG       ST      CC    RAW     TC
    -----------------------------------------------------
    243   08:55:00   14651.6  14652.0   0.0   8.0    0.0


  b) Entry, Governor's Office: ("Syssselmannen, inngang")

       UTC    COUNTS
      ---------------
      09:07   6422.14
      09:10   6422.16
      09:12   6422.16


  c) Quay, "Gamlekaien = NorCargo = Bring":

     h = 3.05 m

       UTC     COUNTS
      ----------------
      09:17   6421.07
      09:21   6421.03
      09:25   6421.07


  d) Still reading:

    -----------------------------------------------------
    DoY     UTC        DG       ST      CC    RAW     TC
    -----------------------------------------------------
    243   09:30:00   14651.6  14651.6   0.0   18.0    0.3
    243   12:00:00   14651.6  14651.6   0.0   31.0    0.1


4.  HSE - HEALTH, SAFTETY, ENVIRONMENT


4.1  Material Safety Datasheets


Description Document
HSE datasheet ISOPAR-M - oil used in all sections of main streamer - USED DURING "SVALEX-2012" SURVEY Link
HSE datasheet MOBILECT-44 - oil used in mini-streamer Link
Lithium batteries for Streamer Birds, HSE datasheet.
Battery supplier: http://www.iongeo.com/
Link



5.  RV "HÅKON MOSBY"


5.1  Vessel information


VESSEL INFORMATION CONTACT INFORMATION
Click to visit webpage describing RV "Håkon Mosby"
  • Phone (via satellite):
    • (+47) 5590 6420
    • (+47) 5590 6423 (Bridge)
  • Mobile (bridge): (+47) 9770 1413
  • Call sign: LJIT
    To reach the vessel via VHF radio, call Vardø coast radio station on (+47) 7898 8231 [or (+47) 120] and ask for RV "Håkon Mosby", stating vessel call sign LJIT.
    Vardø coast radio covers Barent Sea and the coastal areas from the Kola peninsula to Tromsø.

Current position:



6.  GUN CONTROLLER "GUNCO"


6.1  GUNCO connector wiring


The key to understand the GUNCO connector system is to see how the front slot positions of the MSIBG cards corresponds to the connectors on the rear side - see figure below.

We normally only use one MSIBG card located in slot #5. This card will thus have sensors connected on SI3 (labelled "STBD1,2"), and solenoids on SO5 (labelled "STBD 1").

GUNCO connector principle.
GUNCO connector principle.


6.2  GUNCO rack wiring (rear view)


Current system

Click to open PDF document:


GUNCO Rack cabling. Click to open PDF version.

Old system

The difference is that relays have been added for the airgun solenoid test unit, which allows the operator to monitor sensor voltage and current, and measure resistance to solenoid.



6.3  GUNCO Sensor Display


This is what a GUNCO sensor display could look like. Click to see larger version. NOTE: Airgun no. 1,2 and 6 is OK. No. 5 has crossfeed from the solenoid pulse; the "crosfree blanking" feature of the GUNCO is activated (red area), causing any signal that appears within the read zones to be ignored.

GUNCO sensor display. Click to enlarge.
GUNCO sensor display. Click to enlarge.



7.  MINI-STREAMER RECORDING SYSTEM


We will use a two-channel mini-streamer, and record data on a Geometrics GEODE, which is controlled from a PC laptop running Windows.



8.  TIME-STAMPING OF GUNCO SHOT EVENTS


The Ocean Bottom Seismographs that are deployed on the sea floor keeps time using very accurate internal clocks.

It is necessary to obtain time stamp of every shot event in order to process data later on. The time stamping is done by routing the "SCOPE TIME BREAK" from GUNCO signal to a GPS based event recorder.

The "SCOPE TIME BREAK" signal is emitted on "Zero time" - the nominal firing moment of all guns, according to the timing method that has been selected from GUNCO menus. It is emitted in sequence after two control signals have been asserted correctly - the CLOSURE and FIRE signal. The relationship between these three signals is shown below.


Gun Controller timing diagram.

So the falling edge of the SCOPE TIME BREAK signal is used as input for the time stamping unit, which is documented below (click to open documentation web page).

Time tagging unit
Time stamping unit - click to see information.



9.  GRAVITYMETER



Air/Marine Gravitymeter LaCoste & Romberg, S-99

9.1  Logsheets


Logshets can be downloaded from this page: http://www.geo.uib.no/eworkshop/gravitymeter/index.php?n=Main.LogSheets

9.2  Base readings


Tromsø

Ref. this report: http://www.geo.uib.no/eworkshop/gravitymeter/index.php?n=Main.Reports-2008-OBS-SVALEX

Longyearbyen

More later ....



10.  RECORDING LOG SHEET




11.  LOGISTICS, DEPLOYMENT OF LAND STATIONS


11.1  Cargo handling


Tschudi Northern Logistics AS

The Tschudi group has offices in Kirkenes and also Denmark (Virum), see contact web page link below.

Contact information web page

  Tschudi Northern Logistics AS
  Sydvaranger Industriområde
  N-9900 Kirkenes
  Postal address: 
  PO Box 405
  N-9915 Kirkenes
  Telephone: +47 92 69 99 92
  E-mail: agencykirkenes(at)tschudilogistics.com

11.2  Accommodation - Kirkenes


11.3  Car rental Kirkenes




12.  LAND STATIONS


12.1  Introduction


The initial plan is to deploy seismic sensors according to the following arrangement:

  1. 50 stations at 25 locations along E75 on the coast of Varangerhalvøyen (two instruments at each location).
  2. 90 stations at 45 locations along road No. 885 between Kirkenes and Pasvik (also two instruments at each location).
  3. Two broad band stations; one around Børselvsdalen and in the centre of Varangerhalvøyen.

Click to see large view of approximate land station locations:


OBS 2012, land station locations - a sketch. Click to enlarge. Map source: http://kart.finn.no/

To deploy a seismic broad band station temporarily it could be useful to contact the following institutions:

  • Technical departments in the municipalities in question
  • Power generating / distributing companies
  • Norwegian Public Roads Administration

12.2  Municipalities in Finnmark


Here is an overview of municipalities in Finnmark


Municipalities in Finnmark

Direct link to all municipalities in Finnmark:

12.3  Power generating / distributing companies in Finnmark


12.4  Norwegian Public Roads Administration, Øst-Finnmark


email: firmapost-nord@vegvesen.no

Web page: http://www.vegvesen.no/en/Home

  • Kirkenes Traffic Services Office
    Postadresse : Bjerkengveien 2
    9917 Kirkenes
    Visiting address: Bjerkengveien 2
    Tel: 06640
  • Lakselv Traffic Services Office
    Postadresse : Postboks 75
    9711 Lakselv
    Visiting address: Holmenveien 3
    Tel: 06640
    Telefax: 7894 1371
  • Vadsø Traffic Services Office
    Mail address: Båtsfjordveien 18
    9815 Vardsø
    Visiting address: Båtsfjordveien 18
    Tel: 06640
    Telefax: 7895 3352
Department of Earth Science
University of Bergen
N O R W A Y