Krakatau volcano (Indonesia): continuing occasional explosions, field observations 15-17 Aug 2019
Mon, 19 Aug 2019, 16:2016:20 PM | BY: T
The crater lake of Anak Krakatau as observed on 15 or 16 Aug 2019 (image: Stefan Tommasini / facebook)
Two small explosions, probably phreatic (steam-driven), were recorded from the volcano during the past few days, one on 17 Aug at 20:23, the next one earlier today at 09:09 local time.
Heat signals from Krakatau volcano as detected with the MODIS sensor from satellite over the past months (image: MIROVA)
Due to intense haziness in the area, the eruptions were only inferred from seismic signals; no visual observations were made at the observatory. Each of them lasted about 1 minute and were relatively small.
During 15-17 Aug, a small group of VolcanoDiscovery visited the island during our most recent expedition to Krakatau and observed the crater lake, where expedition members Anke Reimer and Stefan Tommasini visited the lake. Anke made some interesting temperature measurements at the crater lake of Anak Krakatau:
The water temperature was 62 degrees Celsius near the shore, probably more (around 80 deg C) in the middle of the lake. He observes also that in the center of the strongly steaming lake, a (cinder) cone seems to just be emerging above water level.
In addition, the water is very acid, with a pH value of around 0.5 according to Stefan's measurments, and much of the gasses are sulphur dioxide (SO2). At the coast, the seawater had a temperature of 35 degrees C. Also here, hot gases and hydrothermal solutions escape. More eruptions are likely in the near future.
Links / Sources:
Links / Sources:
- Fotografie mit Seele (Stefan Tommasini's photography website)
Mon, 19 Aug 2019, 05:45