Ryukyu / Kikai caldera - Sentinel 2 L2A nat. colors bands 4,3,2 from 03.10.2020 - Note the area of discolored coastal waters - one click to enlarge
Ryukyu / caldera Kikai - Sentinel 2 L1C bands 12,11,4 from 03.10.2020 - with a hot spot in the crater - one click to enlarge
Location of the Kikai caldera - Sentinel2 L1C band image 12,11,4 and Maeno and Imamura map (2007). - GVP - one click to enlarge
JMA recorded a small eruption at Satsuma-Iojima / Kikai caldera, southern Japan, on October 6 at 7:57 am local time. It was accompanied by an ash plume reaching over 900 m. altitude, then drifted northwest.
The Kikai caldera has been on level 2 alert / do not approach the crater since November 2, 2019.
The VAAC Tokyo issued an ash scattering advisory.
Sources: JMA & VAAC Tokyo
The Geophysical Institute of Peru (IGP) reports that the eruptive activity of the Sabancaya volcano continues at moderate levels, for the period from September 28 to October 4, with the continuous recording of explosions, at the rate of 40 daily events of low to medium intensity, and accompanied by plumes of ash and gas up to 2.6 km high above the summit dispersing towards the southeast, east, southwest and west sectors of the Sabancaya. This activity has been corroborated by reports of ash fall in the districts of Huanca and Lluta.
The IGP recorded and analyzed the occurrence of 2339 earthquakes of volcanic origin associated with the circulation of magmatic fluids.
During this period, Volcano-tectonic (VT) earthquakes were located mainly to the northeast and northwest of the volcano, with magnitudes from M2.3 to M3.9. The strongest earthquake occurred on September 28 at 2:03 p.m., 19 km away north-west of Sabancaya and 10 km deep.
The monitoring of the deformation of the volcanic structure, using GNSS data (processed with fast orbits), shows a slight inflation of the south-eastern flank of the Sabancaya and the northern sector of the Hualca Hualca.
Satellite monitoring has identified 8 thermal anomalies with values between 1 MW and 13 MW, associated with the presence of a body of lava on the surface in the crater of the volcano.
The volcanic alert level remains at naranja, with a prohibited zone of 12 km in radius around the crater.
Source: I.G. Peru
The IGP continues to record a slight increase in seismic activity at Ubinas during the analysis period from September 28 to October 4.
Seismicity is characterized by 42 Volcano-Tectonic (VT) earthquakes with magnitudes less than M1.3, which would be associated with rock breaking processes. Likewise, 18 seismic signals were recorded which would be
associated with the movement of volcanic fluids (gas, mainly water vapor), within them, 2 earthquakes of the tornillo type.
Plumes of volcanic gas and water vapor reaching heights of up to 300 m above the summit of the volcano are recorded by remote monitoring, dispersed towards the eastern sector of the volcano.
No significant deformation, no thermal anomaly.
The alert level remains in Amarilla, with a forbidden zone of 4 km radius.
Source: I.G. Peru
According to the latest report from OVSICORI-UNA, over the past few days the sulfur dioxide emissions from the Poás have caused a smell of sulfur in neighboring areas and acid rain has been recorded in the Poás Volcano National Park ( PNVP) and the National University of Costa Rica (UNA).
Seismic activity is higher on October 6 compared to the day before.
The Poás volcano continues with passive degassing without eruptive activity. There is no gas data due to adverse wind conditions.