From: In-situ monitoring of 3He/4He in summit gases of Kilauea Volcano (Hawaii) prior to the 2020 eruption
Conventional Sample ID | Collection Date | 3He (Torr) | 4He (Torr) | 3He/4He | R/Ra * | Rc/Ra ** | Rc/Ra *** | Rc/Ra # | Comments |
---|---|---|---|---|---|---|---|---|---|
12/8/20 | 1.86E-11 | 9.10E-07 | 2.04E-05 | 3.3 | n.d. | n.d. | --- | Near-ground gas | |
12/9/20 | 2.41E-11 | 1.02E-06 | 2.37E-05 | 3.8 | n.d. | n.d. | --- | Near-ground gas | |
SB 20-1, SB 20-2 | 12/10/20 | 1.68E-11 | 8.25E-07 | 2.03E-05 | 3.3 | n.d. | n.d. | 0.8, 1.3 | Near-ground gas |
12/11/20 | 2.21E-11 | 9.95E-07 | 2.23E-05 | 3.6 | n.d. | n.d. | --- | Near-ground gas | |
SB 20-3, SB 20-4 | 12/12/20 | 1.75E-11 | 8.16E-07 | 2.14E-05 | 3.5 | n.d. | n.d. | 1.1, 0.7 | Near-ground gas |
SB20-5, SB20-6 | 12/13/20 | --- | --- | --- | --- | --- | --- | 0.3, 1.4 | No monitor sample |
12/14/20 | 1.96E-11 | 9.72E-07 | 2.02E-05 | 3.3 | n.d. | n.d. | --- | Near-ground gas | |
SB20-7, SB20-8 | 12/15/20 | 1.47E-11 | 8.03E-07 | 1.83E-05 | 3.0 | n.d. | n.d. | n.d., 1.4 | Near-ground gas |
12/16/20 | 1.01E-11 | 8.09E-07 | 1.24E-05 | 2.0 | 2.0 | 2.5 | --- | intakes joined to fumarole | |
SB20-9, SB20-10 | 12/17/20 | 3.91E-11 | 1.43E-06 | 2.73E-05 | 4.4 | 12.8 | 15.7 | 14.3, 14.8 | fumarole |
12/18/20 | 3.21E-11 | 1.20E-06 | 2.68E-05 | 4.3 | 12.4† | 15.2† | --- | fumarole | |
SB20-11, SB20-12 | 12/19/20 | 3.39E-11 | 1.09E-06 | 3.12E-05 | 5.0 | 12.2 | 15.0 | 2.0, 1.2 | fumarole |
SB20-13, SB20-14 | 12/20/20 | 3.68E-11 | 1.06E-06 | 3.47E-05 | 5.6 | 13.8† | 17.0† | 16.0, 15.0 | fumarole |
Lab air series | 1/20/21 | 9.24E-12 | 9.29E-07 | 9.95E-06 | 1.6 | --- | --- | --- | lab air, good signal |
1/22/21 | 2.91E-12 | 9.89E-07 | 2.94E-06 | 0.5 | --- | --- | --- | lab air; low signal | |
1/25/21 | 5.87E-12 | 9.91E-07 | 5.92E-06 | 1 | --- | --- | --- | lab air, OK signal | |
2/1/21 | 5.81E-12 | 7.66E-07 | 7.58E-06 | 1.2 | --- | --- | --- | lab air, OK signal | |
2/2/21 | 4.91E-12 | 7.52E-07 | 6.53E-06 | 1.1 | --- | --- | --- | lab air, OK signal | |
2/9/21 | 3.31E-12 | 7.80E-07 | 4.24E-06 | 0.7 | --- | --- | --- | lab air, low signal | |
Lab air average | 1–2/21 | 5.34E-12 | 8.68E-07 | 6.16E-06 | 1.0 | --- | --- | --- | Std. dev. = 0.39 |