Activity of Karymsky, Sinabung, Mauna Loa and Geldingadalsgos.

Karymsky - Photo by D. Melnikov; courtesy of IVS FEB RAS, KVERT - archives 2019.

The Karymsky aviation code was raised to orange, following an ash plume emitted at 8,500 meters asl. by a probable explosion on April 3 at 23:30 UTC; the ashes drift towards the northeast then the ENE of the volcano for 255 km.

A moderate explosive-effusive eruption continues, and could affect international and regional flights.

Sources: KVERT, VAAC Tokyo

Karymsky - volcanic ash advisory for 04.04.2021 - Doc. VAAC Tokyo

Mount Sinabung erupted on Sunday, April 4, 2021 at 7:06 a.m. WIB, with the height of the ash column observed at ± 1000 m above the summit (± 3460 m above sea level). The ash column was observed to be gray, with a thick intensity to the east and southeast. This eruption was recorded on a seismograph with a maximum amplitude of 7 mm and a duration of 111 seconds.

Source: Magma Indonesia

Sinabung - 04.04.2021 / 07:09 WIB - PVMBG webcam

A swarm of 172 earthquakes occurred northwest of the summit of Mauna Loa on March 29 and 31, about 6 to 8 km (3.5 to 5 miles) below the surface. An inclinometer near the summit of Mauna Loa measured a small change in inclination along with the flank swarm. The change in tilt was consistent with the contraction across the summit and has since leveled off.

Over the past week, HVO seismometers have recorded a total of 245 low-magnitude earthquakes (almost all below M3) below Mauna Loa, the most concentrated below the summit and upper flanks of the volcano at depths less than 8 km (about 5 mi) below ground level.

Gas concentrations (0 ppm SO₂) and fumarole temperatures (below 100 degrees Celsius or 212 degrees Fahrenheit) at the summit and at Sulfur Cone in the southwest rift zone remain stable.

The volcanic alert remains in advisory and the aviation code in Yellow.

Source: HVO-USGS

Hawaii - Mauna Loa - D. Peterson / USGS archive photo

The eruption in Geldingadalur is still ongoing, but access to the eruption sites is not allowed until noon.

Public access to the eruption sites has been closed since Friday due to weather, but it was scheduled to reopen to traffic at 6 p.m. today. The Suðurnes Police Chief announced yesterday that the shutdown will be extended and that traffic to the Geldingadalur eruption sites via Suðurstrandarvegur will not be open until noon on Easter Sunday.
Those planning an eruption expedition today are advised to prepare well as the weather will be cold (snow, NE wind 4 m / s; minus 4 ° C)

Sources: IMO & RUV