Jökull - 01.01.2014, Page 36

B. A. Óladóttir et al.,
64°N
64°N
64°N
0
64°N
64°N
64°N
20°W18°W20°W
18°W20°W
18°W20°W
18°W
18°W20°W
18°W20°W
20 km
20 km
20 km
20 km
20 km
20 km
Isopachs in cm
Ucp vol: 2.7 km3
Tmax: 140 cm
Isopachs in cm
Ucp vol: 1.1 km3
Tmax: 100 cm
Isopachs in cm
Ucp vol: 1.0 km3
Tmax: 140 cm
Isopachs in cm
Ucp vol: 0.8 km3
Tmax: 70 cm
Isopachs in cm
Ucp vol: 0.9 km3
Tmax: 100 cm
Isopachs in cm
Ucp vol: 0.3 km3
Tmax: 40 cm
K-I
Age: ~270 BC
K-V
Age: ~580 BC
K-VI
Age: ~630 BC
K-IV
Age: ~540 BC
K-III
Age: ~520 BC
K-II
Age: ~420 BC
1
1
1 1
1
2
2
2
2
2
2
5
5
5
5
5
10
10
10
1010 20
20
140
1
1
1
1
1
12
2
2
2
5
5
70
1
1
1
1
1
2
2
2
2
5
5
5
10
10
100
1
1
1
1
2
2
5
5
10
40
1
1
1
1
1
2
2
2
2
2
5
10
100
0
1
1
1
1
1
1
2
2
2
2
2
2
5
10
140
1
1
1
5
5
5
10
2
5
5
10
1
20
2
Table 5a. Eruption year with errors and minimum volume on land of the nine selected Katla tephra layers. –
Gosár með skekkju og lágmarksrúmmál níu gjóskulaga frá Kötlu.
K-I K-II K-III K-IV K-V K-VI K-VII K-VIII K-IX Average
Mean eruption year (BC) 270±60 420±60 520±50 540±50 580±40 630±50 910±40 980±40 1150±40
Tmax used (cm) 140 70 100 40 100 140 100 50 100 90
Min. compacted vol. 1.6±0.08 0.5±0.02 0.5±0.03 0.2±0.01 0.6±0.03 0.6±0.03 0.3±0.02 0.1±0.01 0.5±0.02 0.5
on land (km3)
Min. uncompacted vol. 2.7±0.13 0.8±0.04 0.9±0.04 0.3±0.01 1.1±0.05 1.0±0.05 0.6±0.03 0.2±0.01 0.8±0.04 0.9
on land (km3)?
Tephra fall area on land ∼10400 ∼3400 ∼4500 ∼2800 ∼5200 ∼8200 ∼4500 ∼1700 ∼5200 ∼5100
within 1 cm isopach (km2)
?Assuming 40% compression.
Table 5b. Uncompacted volume on land of the eight historical Katla eruptions (from Larsen, 2010). – Rúmmál
átta sögulegra Kötlugjóskulaga reiknað sem nýfallin gjóska á landi (Larsen, 2010).
1755 1721 1660 1625 1612 1500 ∼1357 1262 Average
Min. UCP vol. on land (km3) 0.8 0.3 0.26 0.5 0.04 0.5 ∼0.2 0.5 0.4
Tephra fall area on land within 1 cm isopach (km2) ∼6000 ∼2800 ∼2100 ∼5500 ∼300 ∼6800 ? ∼4550 ∼4000
?not given as isopachs reach out to sea.
36 JÖKULL No. 64, 2014