doi : 10.17596/0003006

NATSUSHIMA Cruise Report
NT13-20

Abashiri Submarine Canyon
Sep. 8, 2013 - Sep. 18, 2013
Japan Agency for Marine-Earth Science and Technology(JAMSTEC)Contents

1. Cruise Information

2

2. Researchers3

3. Observation

4

3.1 Overview of the Observation

4

3.1.1 Background and Purpose

4

3.1.2 Research Items and Activities

4

3.2 Bathymetric and Seismic Surveys

5

3.3 Coring and Core Analysis

6

3.3.1 Station List of Coring

6

3.3.2 Core Lithology

6

3.3.3 Gas Analysis

14

3.3.4 Pore Water Analysis

16

3.3.5 Sediment Analysis

17

4. Notice on Using

18

5. Acknowledgements

18

6. Appendices19

6.1. Cruise Log

19

6.2 R/V NATSUSHIMA Officers and Crew21

1

1. Cruise Information
Cruise ID:

NT13-20

Name of vessel:

R/V NATSUSHIMA

Title of the cruise:

Distribution and origin of gas hydrate off Abashiri, Okhotsk Sea

Title of proposal:

Basic study on distribution and origin of seabed methane and gas hydrate
on continental slope off Abashiri, Okhotsk Sea

Cruise period:

September 8, 2013 – September 18, 2013

Ports of call:

September 8, 2013 Dept. from Otaru
September 18, 2013 Arrive. at Sekinehama

Research area:

Abashiri Submarine Canyon

Research map:

Fig. 1.1 Cruise track of NT13-20.

2

2. Researchers
Chief scientist:
Satoshi YAMASHITA

Kitami Institute of Technology

Representative of the science party:
Nobuo TAKAHASHI

Kitami Institute of Technology

Science party:
Hitoshi SHOJI

Kitami Institute of Technology

Hirotsugu MINAMI

Kitami Institute of Technology

Akihiro HACHIKUBO

Kitami Institute of Technology

Hirotoshi SAKAGAMI

Kitami Institute of Technology

Shintaro YAMASAKI

Kitami Institute of Technology

Satsuki KATAOKA

Kobe University

Ryuji MIURA

Kitami Institute of Technology

Tsuyoshi KOTAKE

Kitami Institute of Technology

Keisuke KUBO

Kitami Institute of Technology

Keisuke OGAWA

Kitami Institute of Technology

Yota SASAKI

Kitami Institute of Technology

Takuma HIRANO

Kitami Institute of Technology

Syohei TOKIWA

Kitami Institute of Technology

Marine Technician:Satoshi OKADA

Nippon Marine Enterprises, LTD.

Masayuki TOIZUMI

Nippon Marine Enterprises, LTD.

Satomi MINAMIZAWA

Nippon Marine Enterprises, LTD.

Kimiko SERIZAWA

Nippon Marine Enterprises, LTD.

Yasushi HASHIMOTO

Marine Works Japan, LTD.

Naotaka TOGASHIMarine Works Japan, LTD.

Kazuhiro YOSHIDA

Marine Works Japan, LTD.

Mika YAMAGUCHI

Marine Works Japan, LTD.

3

3. Observation
3.1 Overview of the Observation
3.1.1 Background and Purpose
When Japanese resource project of gas-hydrate launched in 1995, the seismic data of Kitami-Yamato
Bank off Abashiri, Okhotsk Sea caught outstanding BSRs (Bottom Simulating Reflectors), whichindicated the existence of gas-hydrate. Then, obvious BSRs and geologic structures indicating
gas-hydrate also showed in the seismic data collected by GH01 cruise in 2001 for the same area
conducted by Geological Survey of Japan, AIST. However, the sufficient survey has not been carried out
after GH01 cruise, and the actual geologic condition and its gas-hydrate formative condition have notbeen clear. Our recent survey cruises conducted in 2012 found many gas-flares and retrieved crystals of
gas-hydrate from a part of off Abashiri. These facts suggest that promising wide gas-hydrate formative
area exists around this area.
Therefore, to clarify the distribution of gas-hydrate and its formative environment of seabed methane,
and to evaluate the potential as resource of gas-hydrate, the geologic survey was conducted by this cruise
covering a wide area of Abashiri Submarine Canyon. The conducted investigations are the seismic
geologic survey, the bathymetry and the gas-flare observation by an echo sounder, and drill sampling ofsea-bottom sediments.

3.1.2 Research Items and Activities
Seismic survey
To analyze geological structure and obtain the depth distribution of BSR, the Single Channel Seismic(SCS) survey along following lines were conducted:
line 144°10.000’N, 144°30.000’E －44°10.000’N, 144°50.000’E

line 244°11.647’N, 144°30.000’E －44°11.647’N, 144°50.000’E

line 344°23.000’N, 144°30.000’E －44°23.000’N, 144°56.000’E

line 444°23.000’N, 144°56.000’E －44°24.000’N, 144°45.000’E

line 544°24.000’N, 144°45.000’E －44°10.000’N, 144°45.000’E.

Bathymetry and gas-flare observation surveys
The bathymetry for the survey area conducted with the multi narrow beam system (SEBAT8600), andmapping and observations of gas-flares were conducted with the multi narrow beam system and thequantitative echo sounder (ER60). The following areas and points are surveyed:- Abashiri Submarine Canyon (water depth; 500 - 1350 m)
44°10.0’N, 144°30.0’E－44°24.0’N, 144°30.0’E－44°24.0’N, 144°56.0’E－44°10.0’N, 144°56.0’E- North east of Rebun Island
45°33.55’N, 140°34.57’E (water depth; 480 m)
45°27.04’N, 140°44.55’E (water depth; 600 m).

4

Core sampling of sea-bottom sediment and sea water
The sediment core sampling was carried out at three stations on the Abashiri Submarine Canyon byusing the piston (PC) and gravity (GC) coring system. The sea water on the seabed was also retrieved by
the Ashura corer (pilot corer). The total number of PC and GC sampling is 8. The lengths of piston corer
are 4 or 6 m, and its weight is 480 kg. The gravity corer length is 4 m, and its weight is 200 kg. Their core
diameters are 75 mm.

3.2 Bathymetric and Seismic Surveys
To analyze the sea bottom topography, bathymetric analysis was carried out by using multibeam echosounder system, SeaBat 8160. This analysis was carried out along 21 measuring lines of Abashiri
Submarine Canyon area, Okhotsk Sea and 2 lines of east off the Rebun Island area, Japan Sea. To analyze
the geologic structure, Single channel seismic reflection survey was conducted with one channelhydrophone group streamer cable (S.I.G. Inc.). Length of active section is 65m and lead – in cable is
135m. We employed the G.I. Gun (Sercel Inc.) for seismic source. Source volume was 150 cubic inch (G:45, I: 105). Towing length was 30 m from aft peak, shooting rate was 10 per second. This analysis was
carried out along 5 lines of Abashiri submarine canyon area. The geologic structures were obtained
shallower than about 200 m below the sea bottom.

Fig. 3.1 Bathymetry map of Abashiri submarine canyon area.

5

3.3 Coring and Core Analysis
3.3.1 Station List of Coring
Table 3.1 Coring Summary of NT13-20 cruise
Date
(UTC)

Core ID

Corer type*

PC01
PL01
PC02
PL02
PC03
PL03
PC04
PL04
PC05
PL05
PC06
PL06
PC07
PL07

Inner type PC
Ashura corer
Inner type PC
Ashura corer
Inner type PC
Ashura corer
Inner type PC
Ashura corer
Inner type PC
Ashura corer
Inner type PC
Ashura corer
Inner type PC
Ashura corer
Gravity corer(200kg)

LocationLat.（TP**）Lon.（TP**）

Lat.（Ship）

Lon.（Ship）(yymmdd)

2013/9/10
2013/9/11
2013/9/11
2013/9/12
2013/9/12
2013/9/12
2013/9/13
2013/9/13

GC08

Depth
(m)

Off Abashiri

44°11.5759' N 144°38.1379' E 44°11.5762' N 144°38.0982' E

573

Off Abashiri

44°11.5829' N 144°38.0095' E 44°11.5849' N 144°37.9715' E

580

Off Abashiri

44°11.6504' N 144°37.8041' E 44°11.6383' N 144°37.7692' E

651

Off Abashiri

44°11.6659' N 144°34.1727' E 44°11.6809' N 144°34.1392' E

678

Off Abashiri

44°11.9298' N 144°34.2196' E 44°11.9412' N 144°34.1821' E

704

Off Abashiri

44°10.0589' N 144°42.9396' E 44°10.0520' N 144°42.9096' E

770

Off Abashiri

44°10.6210' N 144°43.1624' E 44°10.6188' N 144°43.1263' E

822

Off Abashiri

44°10.0613' N 144°42.9429' E 44°10.0649' N 144°42.9112' E

769

Corebarrel Tension
K
lengthmax.
value***
(m)
(kN)
4
13.8
0.22
0.6
4
25.1
0.52
0.6
4
16.0
0.18
0.6
4
14.2
0.12
0.6
6
16.3
0.12
0.6
6
15.9
0.10
0.6
6
15.7
0.09
0.6
3

9.5

0.07

Core length（cm）****
148.5
0.0
0.0
219.6
0.0
0.0
0.0
380.0 (include void)
27.2
30.1
27.5
235.5
27.0
27.0
26.1
463.8
29.8
27.9
29.6
500.0 (pipe length)
41.9
37.1
44.4
435.1
50.9
58.7
59.0
0.0

136.2

*Weight of the PC is 480 kg.
**"TP" is position by the transponder.
***K value is the strength barometer of the sea floor sediment;
K value = pure pull out load / (outer diameter of outer pipe x penetration length).
****Core length is W-half measured after splitting.

3.3.2 Core Lithology
Sea bottom sediments and gas hydrates were sampled by piston corer and gravity corer. We sampled
gas hydrate at three sites, and gas hydrate preserved with in-situ structure at PC02 site. All cores have sea
fine sand, silt and clay, in addition, shells and carbonate gravel. These colors are dark green gray, black
and white gray. Following pages are photos of all archive cores.

Photo 3.1 Core observation.

6

Photo 3.2 Core photo of NT13-20 PC01.

7

Photo 3.3 Core photo of NT13-20 PC02.

8

Photo 3.4 Core photo of NT13-20 PC03.

9

Photo 3.5 Core photo of NT13-20 PC04.

10

Photo 3.6 Core photo of NT13-20 PC05.

11

Photo 3.7 Core photo of NT13-20 PC06.

12

Photo 3.8 Core photo of NT13-20 PC07.

13

Photo 3.9 Core photo of NT13-20 GC08.

3.3.3 Gas Analysis
Sea-bottom sediments were sampled using a piston corer and a gravity corer during the cruise of RV
Natsushima in September 2013 (NT13-20) at Okhotsk Sea off Abashiri. Sediment cores were retrieved
from the Abashiri Submarine Canyon area. These locations and sample lists are summarized in Table 3.2
Gas hydrates were found in 3 cores during the cruise.
Following sampling for gas hydrate analyses were executed in the cruise: (1) sampling of
hydrate-bound gas for molecular and isotopic measurements, (2) sampling of dissolved gas in pore water
for molecular and isotopic measurements. Gas hydrate nodules were also stored into liquid nitrogen forfurther use. These sampling methods have been described by our previous report (Jin et al., 2012;
Hachikubo et al., 2010; 2011).
Hydrate-bound gases were collected using a funnel and plastic bucket filled with water. Gas hydrate
samples were dissociated in water and their gases were collected in 5-mL vials sealed with butyl septum
stoppers. The dissolved gases in the pore water were extracted by a headspace gas method whereby
10-mL of sediment and a 9.7-mL saturated aqueous solution of NaCl were introduced into a 25-mL vial
to create headspace. A 0.3-mL preservative (benzalkonium chloride (Waseda and Iwano, 2007), 50 wt%
aqueous solution) was introduced into the 25-mL vial. The headspace was flushed by helium and the vials

14were then thoroughly shaken and stored overturned. Gas hydrate crystals were stored in a dryshipper at
the temperature of liquid nitrogen.
Gas composition of hydrocarbons (from C1 to C3), CO2 and H2S will be measured in KIT using a gas
chromatograph (GC-2014, Shimadzu Corp.) equipped with thermal conductivity and flame ionization
detectors coupled with a packed column (Sunpak-S, Shimadzu Corp.). The thermal conductivity detector(TCD) is to measure air components (N2, O2 and Ar: they are not separated), CO2, H2S and highconcentration of C1. The flame ionization detector (FID) is to measure minor (low concentration)hydrocarbons because of its high sensitivity for C2-3. Carbon and hydrogen isotopes of hydrocarbons will
be measured using a CF-IRMS (DELTA plus XP, Thermo Finnigan) employing a Carboxen-1006 PLOT
capillary column (30 m length, 0.32 mm I.D., Supelco). To avoid air contamination in low concentration
cases of C1, a Carboxen-1010 PLOT capillary column (30 m length, 0.32 mm I.D., Supelco) will be also
used. The lower limit of C1 determination in the case of C1 δ13C is 0.02% of the total headspace gas. A
backflush system of GC coupled with CF-IRMS enables us to resolve low concentrations of C2 and C3(less than 0.1%) from C1 and measure their isotopic composition.
Table 3.2 Sampling date, core name, site, and sampling items.
Date

Core

Place

Dissolved

gasin

Hydrate gas

pore water
20 mL vial
2013/9/11

PC01

St1

6

2013/9/11

PC02

St1

10

2013/9/11

PC03

St1

18

2013/9/12

PC04

St2

13

2013/9/12

PC05

St2

13

2013/9/13

PC06

St3

1

2013/9/13

PL06

St3

6

2013/9/13

PC07

St3

22

2013/9/13

GC08

St3

7

5 mL vial
85

References
Hachikubo, A., Krylov, A., Sakagami, H., Minami, H., Nunokawa, Y., Shoji, H., Matveeva, T., Jin, Y. K.,
and Obzhirov, A. (2010) Isotopic composition of gas hydrates in subsurface sediments from offshore
Sakhalin Island, Sea of Okhotsk. Geo-Mar. Lett., 30, 313–319, doi:10.1007/s00367-009-0178-yHachikubo, A., Tatsumi, K., Sakagami, H., Minami, H., Yamashita, S., Takahashi, N., Shoji, H., Jin, Y.
K., Vereshchagina, O., and Obzhirov, A. (2011) Molecular and isotopic compositions of15

hydrate-bound hydrocarbons in subsurface sediments from offshore Sakhalin Island, Sea of Okhotsk.
Proceedings of the 7th International Conference on Gas Hydrates (ICGH2011), 17-21 July, 2011,
Edinburgh, UK
Jin, Y. K., Shoji, H., Obzhirov, A., and Baranov, B. (2012) Operation Report of Sakhalin Slope Gas
Hydrate Project 2012, R/V Akademik M. A. Lavrentyev Cruise 59, Korea Polar Research Institute,
112 pages
Waseda, A., and Iwano, H. (2007) Reservoir evaluation using carbon isotope composition of gas (inJapanese with English abstract). J. Japanese Assoc. Petrol. Technol., 72(6), 585–59

3.3.4 Pore Water Analysis
The pore water sampling was conducted on board the R/V Natsushima using centrifuge method.
The pore water sampling procedure is as follows:(i) Centrifuge
A 10 cm portion (10 cm depth interval) of the sediment core was taken into a plastic tube (volume: 50mL) of a centrifuge machine and was kept in a refrigerator (usually less than one day) until centrifuge
separation process was started. The sediment sample in the tube was then rotated at 3,500 r.p.m. for 20
minutes. When pore water was obtained from sediment interval containing gas hydrates, centrifuge
condition at 3,500 r.p.m. for 20 minutes was used. The pore water was separated as supernatant in thecentrifuge tube after rotation. The pore water sample was then taken into a polypropylene bottle (11 mL)
passing through a 0.2 μm PTFE membrane filter and was kept under chilled temperature (in a refrigeratorof the research vessel).
Water samples to be measured
The water samples obtained during in this cruise are 170 samples including (i) pore water samples, (ii)sea bottom water samples, and (iii) gas hydrate water samples. The sea bottom water samples wereobtained by the pilot corer. The sea water from top of the gravity corer was also sampled. The gas hydrate
water samples were obtained by the dissociation of gas hydrate samples. All water samples were filtrated
by the 0.2 μm PTFE membrane filters and were kept under chilled temperature.
Chemical analyses of pore water
The pore water samples will be analyzed for sulfate ion, chloride ion, hydrogen carbonate ion, calcium,
potassium, sodium and magnesium. The concentrations of anions will be determined by ion
chromatography. The concentrations of sodium and magnesium will be determined by inductively
coupled plasma optical emission spectrometry. The concentrations of potassium and calcium will be
determined by flame atomic absorption spectrometry.
Stable isotope ratios of oxygen and hydrogen of the pore water samples will be analyzed by isotope
ratio mass spectrometry. The results of the isotopic measurements of the water samples will be presented
in per-mil delta notations (δ18O and δD) relatively to Vienna Standard Mean Ocean Water (VSMOW)

16

and Standard Light Antarctic Precipitation (SLAP) issued from International Atomic Energy Agency(IAEA).

3.3.5 Sediment Analysis
To examine the soil properties of sea-bottom sediments and to evaluate the effect of the vaporization ofdissolved gas in the pore water on the mechanical properties, two kinds of on-board tests were performed
for the samples retrieved by a piston corer and a gravity corer.
On-board Tests
To measure the strength of sediments immediately after recovery, the following two kinds of tests were
performed on-board.
a) Vane shear test
The test was conducted by using shear vanes of 10 mm in diameter, D, and 20 mm in height, H,
attached to a compact torque driver. The vane shear test was conducted at 10 to 20 cm intervals on thelongitudinally cut core surface (see photo 3.10). The maximum torque, M, is measured by rotating thetorque driver while penetrating the vane in the core. The vane shear strength, τv, is calculated from thefollowing equation.

τv =M
D H D3
π(
+ )
2
6
2

b) Cone penetration test
The device used is a force gage type compact cone penetration meter (see photo 3.11). The diameter,
length, and apex angle of the cone are 9mm, 18mm, and 30degrees. As for the vane shear test, the cone
meter was applied to the longitudinally cut core surface at 10 to 20 cm intervals to measure thepenetration load, p. The cone penetration resistance, qc, is obtained using the following equation.

qc =

p
A

(A: the sectional area of the cone)

Photo 3.10 Vane shear test

Photo 3.11 Cone Penetration test17

Sub-sampling
For measurement of the various laboratory tests, the following two kinds of samples were taken.
a)

10 to 20 cm interval sample (about 5ml, total 105samples) for measurement of the water content.

b) 20 to 30 cm interval disturbed sample (total 82samples) and undisturbed sample (hole core, 10cm
length, total 5 samples) for measurement of the grain size distribution, specific gravity, liquid andlimits, box shear test, etc.
Table 3.3 shows the test and samples list for on-board and laboratory tests.
Table 3.3 On-board test and sample lists for soil analysis.
On-board test

Sub-sampling

Water Depth

Core length

(m)

(cm)

NT13-20 PC01*

573

150

NT13-20 PC02*

580

190

10

10

10

4

NT13-20 PC03

651

364

18

18

18

19

NT13-20 PC04

678

256

13

13

13

8

NT13-20 PC05

704

434

22

22

22

21

NT13-20 PC06*

770

46

1

1

NT13-20 PL06*

770

40,41,43

6

3

NT13-20 PC07

822

434

22

22

22

15

NT13-20 GC08

769

133

5

5

7

7

90

90

105

82

Core name

Total

Vane shearCone
penetrationwater content
6Lab. test
Zip.

Hole

4

2

3
5

* core contained gas hydrate

4. Notice on Using
This cruise report is a preliminary documentation as of the end of the cruise.
This report may not be corrected even if changes on contents (i.e. taxonomic classifications) may befound after its publication. This report may also be changed without notice. Data on this cruise report may
be raw or unprocessed. If you are going to use or refer to the data written on this report, please ask the
Chief Scientist for latest information.
Users of data or results on this cruise report are requested to submit their results to the DataManagement Group of JAMSTEC.

5. Acknowledgements
We are grateful to Captain T. Aoki, the officers and the crew of the R/V Natsushima for skillful
operations of the ship and research equipment. We are also grateful to technical staffs from Nippon
Marine Enterprises, Ltd. and Marine Works Japan, Ltd. for making this cruise a success. The research
conducted on this cruise was partly supported by Kitami Institute of Technology and Ministry of
Education, Culture, Sports, Science and Technology through Grant-in Aid for Scientific Research.

18

6. Appendices6.1. Cruise Log
Date

Local Time

13:00-13:30
14:30-15:00
16:40-17:00
21:30

Komplia seremony for good cruise.
Arrived at methane plume survey area.

08:00
09:20
10:15-10:40

21:34

Released XBT.

21:36

Com’ced MBES methane plume survey.
Arrive at research area
Finished MBES survey, then proceeded toresearch area.
Arrived at research area, then com’ced to
MBES mapping survey and released XBT.

09-Sep-13
01:06
18:20

06:08
08:55
15:02
15:10
17:34

SCS survey (Line1,Line3)
Finished MBES mapping survey.
Lounched GI gun.
Lounched streamer cable.
Com’ced SCS survey on line 1.
Cleaed out line 1.
Com’ced SCS survey on line 3.
Cleaed out line 3 & finished SCS survey.
Recovered streamer cable.
Recovered GI gun.
Com’ced to MBES mapping survey.
Carry out Piston corer sampling
Finished MBES mapping survey.
Piston corer (PC01) stuck in the sea bottom.
Piston corer (PC02) stuck in the sea bottom.
Piston corer (PC03) stuck in the sea bottom.
Com’ced to MBES mapping survey.

05:50
09:38
13:09
14:50-15:10

Carry out Piston corer sampling & SCS
survey (Line19, Line20, Line21)
Finished MBES mapping survey.
Piston corer (PC04) stuck in the sea bottom.
Piston corer (PC05) stuck in the sea bottom.
Carried out MBES mapping survey.

04:15
08:09
08:30
09:43
12:51
13:25
17:38
17:46
17:58
18:14

11-Sep-13

12-Sep-13

15:44
15:52
16:24
20:43
21:10
23:09
23:30
13-Sep-13

Description

Sail out, arrive to methane plume survey
area
Boarded.
Let go all shore line, left OTARU.
Carried out onboard education & training forscientists.
Practiced fire and water proof station drills.
Scientific meeting.

08-Sep-13

10-Sep-13

Note

Lounched GI gun.
Lounched streamer cable.
Com’ced SCS survey on line 19.
Cleaed out line 19.
Com’ced SCS survey on line 20.
Cleaed out line 20.
Com’ced SCS survey on line 21.
SCS survey (Line21) & Carry out Piston

19

Position/Weather/Wind/Sea condition
09/08 12:00(UTC+9h)

For Off Abashiri

43-35.8N,141-01.1E
Ishikari Wan
CloudyNW-2 (Light breeze)
2 (Sea smooth)
1 (Low swell)
Visibly: 8'

45-20.5497N,
140-44.5683E
09/09 12:00(UTC+9h)
44-59.2N,143-10.5E
44-23.9874N,
144-30.0655E

Off EkoBlue sky
NW-3 (Gentle breeze)
2 (Sea smooth)
1 (Low swell)
Visibly: 8'
09/10 12:00(UTC+9h)
44-10.0N,144-44.7E
Off Abashiri
Fine but clowdy
NE-2 (Light breeze)
2 (Sea smooth)
1 (Low swell)
Visibly: 8'

Depth= 574 m
Depth= 579 m
Depth= 653 m

09/11 12:00(UTC+9h)
44-11.6N,144-38.0E
Off Abashiri
Fine but clowdy
SE-2 (Light breeze)
2 (Sea smooth)
1 (Low swell)
Visibly: 8'
09/12 12:00(UTC+9h)

Depth= 674 m
Depth= 704 m

44-11.9N, 144-34.2E
Off Abashiri
CloudyEast-2 (Light breeze)
2 (Sea smooth)
1 (Low swell)
Visibly: 7'

09/13 12:00(UTC+9h)

12:2012:24

corer sampling
Cleaed out line 21.
Recovered streamer cable.
Recovered GI gun.
Piston corer (PC06) stuck in the sea bottom.
Piston corer (PC07) stuck in the sea bottom.
Piston corer (PC08) stuck in the sea bottom.
Left research area for methane plume survey
area.
Carry out MBES methane plume survey
Arrived at methane plume survey area.
Com’ced to MBES methane plume survey.

12:27

Released XBT.

13:14

Finished MBES methane plume survey.
Left methane plume survey area for Aomori
Wan.

03:01
06:33
06:45
08:45
13:13
15:42
16:30
14-Sep-13

13:15

15-Sep-13

09:00-09:40
18:48
18:50

Arrive at Aomori Wan & Anchoring
Scientific seminar.
Arrived at Aomori Wan.
Let go the anchor at Aomori Wan.

Anchoring at Aomori Wan

16-Sep-13

Depth= 770 m
Depth= 820 m
Depth= 772 m

44-10.6N, 144-43.2E
Off Abashiri
Overcast
NNE-1 (Light air)
1 (Sea Calm)
1 (Low swell short)
Visibly: 7'45-32.5476N,
140-37.3486E

09/14 12:00(UTC+9h)
45-33.6N, 140-42.0E
West of Rebunto
Fine but clowdy
NE-3 (Gentle breeze)
4 (Sea moderate)
3 (Moderate short)
Visibly: 8'
09/15 12:00(UTC+9h)
41-43.6N, 139-51.0E
Off Okushirito
Rain
SSW-4 (Moderate
breeze)3 (Sea slight)
2 (Low swell long)
Visibly: 5'
09/16 12:00(UTC+9h)
40-52.4N, 140-45.9E
Aomori Wan
Rain
NNE-6 (Strong breeze)
4 (Sea moderate)
3 (Moderate short)
Visibly: 1'

17-Sep-13
08:00

18-Sep-13
09:00
12:00

Anchoring at Aomori Wan & Proceeding
to Sekinehama Ko
Heaving anchor, then com'ced proceeding toSekinehama.

Arrive at Sekinehama Ko
Arrived at Sekinehama Ko.
Disembarked from NATSUSHIMA.
Concluded NT13-20 cruise.

20

09/17 12:00(UTC+9h)
41-34.0N, 140-51.0E
Off Oomasaki
Fine but clowdy
SW-7 (Near gale)
5 (Sea Rough)3 (Moderate short)
Visibly: 8'
09/18 12:00(UTC+9h)
Sekinehama Ko6.2 R/V NATSUSHIMA Officers and Crew
CaptainAOKI TAKAFUMI

Chief Officer

ADACHI TATSUO

2nd Officer

TAKAHASHI TOMOYUKI

3rd Officer

IJICHI KAKERU

Chief Engineer

SHIBATA HIROYUKI

1st Engineer

TADOOKA NAOHITO

2nd Engineer

IKUTA SHINITI

3rd Engineer

YOSHIMURA SHOGO

Chief Electronics Operator

SUDA FUKUO

2nd Electronics Operator

KATAGIRI MICHIYASU

3rd Electronics Operator

TAKAKUWA TATSUHIRO

3rd Electronics Operator

SHIROZUME TAKATOMO

Boat Swain

HOSOKAWA SEIJI

Able Seaman

FUJII YOSHITSUGU

Able Seaman

KONNO YASUOAble Seaman

NAGAI HIROAKI

Sailor

KAWAMURA KOSEI

Sailor

NAKANISHI TORU

SailorKAWABE YASUNOBU

Sailor

KOJIMA SHINYA

No.1 Oiler

IKEDA TOSHIKAZU

Oiler

SATO KAZUOOiler

AIZAWA KOTA

Oiler

TANIGUCHI KEIYA

Oiler

SUMITOMO SHOTARO

Chief Steward

YOSHIKAWA TERUYUKI

StewardKIRITA KOJI

StewardOKADA YOSHIO

Steward

OHBA HIROYUKI

Steward

NAKANO MIZUKI

21