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Table 1 Estimated gas composition

From: Variation of volcanic gas composition during the eruptive period in 2014–2015 at Nakadake crater, Aso volcano, Japan

Date

Site

CO2/SO2

H2O/SO2

H2/SO2

SO2/H2S

SO2/Cl

Cl/F

AETS (°C)

(yy/mm/dd)

No.

Note

(mol ratio)

Fumarolic gas

15/10/2003

3

 

5.0

26a

6.2

8.1

 

04/10/2004

2

 

1.8

135

6.0#

15

13

26/10/2006

2

 

3.6

60a

0.010

6.0

19

500

19/09/2007

1

 

4.8

43

0.28

13

11

3.7

890

28/02/2008

1

 

2.2

20a

0.11

20

11

2.5

890

29/02/2008

1

 

2.1

35a

0.05

20

12

2.7

720

10/07/2008

1

e

3.6

45a

0.15

29

5.7

6.6

840

10/07/2008

1

f

2.2

50a

0.07

23

4.8

8.0

720

11/07/2008

1

e

3.0

65a

0.10

25

4.7

7.2

740

11/07/2008

1

f

3.0

55a

0.13

32

4.8

7.2

800

28/10/2008

1

 

1.7

40a

0.15

31

9.0

4.3

860

23/03/2009

1

e

4.0

70a

0.13

19

7.9

5.4

740

23/03/2009

1

f

2.7

60a

0.11

23

7.0

5.1

740

19/11/2009

1

e

4.3

50a

0.33

12

12.5d

3.4d

900

19/11/2009

1

f

3.0

44

0.36

17

12.5d

3.4d

950

19/11/2009

1

g

2.9

45

0.33

17

12.5d

3.4d

930

19/11/2009

1

h

3.4

37

0.38

15

12.5d

3.4d

970

06/07/2010

1

 

3.2

47

0.010

8.6

6.5

7.0

530

19/08/2010

1

 

4.5

89

0.05

7.0

5.0

8.5

600

01/10/2010

1

 

4.7

70

0.03

6.5

9.0

20

560

28/04/2011

1

 

10.0

80

0.010

5.0

9.7

25

480

05/12/2011

1

 

4.6

60a

0.013

13

120

540

27/03/2012

1

 

4.5

40

0.024

5.0

7.9

6.7

590

15/03/2013

1

 

5.3

40

0.07

6.0

13

5.2

700

06/08/2013

1

 

3.8

50a

0.11

7.0

15

7.5

730

07/10/2013

1

 

6.2

50

0.20

6.5

13

3.8

790

28/02/2014

1

K

3.5

30

0.07

6.0

16d

4.0d

730

28/02/2014

1

L

6.0

50a

0.05

5.0

16d

4.0d

640

06/06/2014

1

 

5.8

30

0.30

9.0

20

3.3

940

18/11/2014

1

 

3.1

64

0.30

6.0

8.5

3.2

810

Lake Gas

19/10/2003

4

 

0.8

3.0

33

04/10/2004

6

 

1.9

66

70#

107

1.6

25/04/2005

4

 

1.2

34

0.06

6.5

5.0

90

700

19/11/2005

4

 

2.3

56

0.05

59

210

1.3

710

26/10/2006

5

 

2.2

50a

0.020

50

100

18

620

27/10/2006

4

 

2.6

0.010

60

26

17/09/2007

5

 

1.7

190a

0.06

140

130

4.0

630

18/09/2007

6

 

2.0

120a

0.05

85

44

3.1

640

28/02/2008

7

 

1.4

80a

0.06

170

40

3.3

740

10/07/2008

5

 

1.3

11/07/2008

5

 

0.8

70a

0.05

100

79

15

710

28/10/2008

5

 

1.7

180a

0.05

300

90

3.4

650

23/03/2009

5

 

1.0

90a

0.030

2000

24

4.9

730

24/03/2009

5

 

1.0

100a

0.010

2000

28

9.0

610

06/07/2010

5

 

0.5

42

0.05

100

6.5

23

760

19/08/2010

5

 

0.7

80a

0.05

1000

13

17

780

28/04/2011

5

 

0.7

30

0.022

4.5

3.0

66

610

19/05/2011

6

K

0.5

20a

0.07

10

5.7d

8.0d

800

19/05/2011

6

L

1.0

45a

0.04

7.0

5.7d

8.0d

640

27/03/2012

5

K

0.34

54

0.08

200

55d

4.9d

820

27/03/2012

5

L

0.87

50a

0.06

20

55d

4.9d

700

15/03/2013

5

 

0.35

50

0.06

150

70

10

780

06/08/2013

5

 

0.7

80

0.08

40

10

23

710

07/10/2013

5

 

0.7

80

0.08

40

4.8

17

710

28/02/2014

5

 

0.8

0.06

10

7.1

65

06/06/2014

5

 

0.6

50a

0.20

60

8.1

3.2

900

18/11/2014

5

 

1.0

40a

0.05

500

11

2.2

840

During eruption

12/01/2015

3

A

8.0

30

0.11

3.0

770

12/01/2015

3

B

1.6

30

0.11

40

870

12/01/2015

3

C

1.6

30

0.11

300

990

25/02/2015

8

B’

1.7

60

0.16

24

4.9

790

17/03/2015

6

A”

4.0

400b

0.10

3.0

2.2d

5.1d

510

17/03/2015

6

B”

1.6

70b

0.015

30

2.2d

5.1d

560

17/03/2015

6

C”

1.6

70b

0.008

300

2.2d

5.1d

570

19/05/2015

4

 

3.2

0.007

6.5

57

11

440c

20/05/2015

2

 

2.4

0.006

4.6

8.6

18

430c

20/05/2015

4

 

3.5

0.011

3.4

6.8

20

440c

20/05/2015

5

 

2.4

5.7

4.6

12

 
  1. e, f, g and h are results of sequential measurements within a single day. K and L are end-member compositions of variable composition obtained by a single measurement. A, B and C (and their prime and double prime) are representative compositions of the variable compositions observed in a day during the eruptive period (see text for details)
  2. not determine, # Measured by the test tube (Komyo Rikagaku Kogyo Co.)
  3. aThe poor quality data with the correlation factor < 0.6, due to large variation in the atmospheric H2O concentration
  4. bThe poor quality data due to large variation in the atmospheric H2O concentration
  5. cCalculated with an assumption of H2O/SO2 = 100
  6. dA single AF sample collected during the multiple measurement of Multi-GAS