From October 3 to 9, the explosive activity of Stromboli, informed by the INGV OE, was mainly produced by three eruptive vents located in the area of the North crater and by at least two eruptive vents located in the area of the Center crater- South. All the mouths are placed inside the depression which occupies the terrace of the crater.
On October 3 and 4, 2022, two lava flows were emitted from the northern area of the crater, while on October 9, a lava overflow followed by a pyroclastic flow occurred from the same area of the crater.
Lava flows of October 3 and 4, 2022:
At 09:08:56 UTC, from a fracture on the outer cone of sector N2 inside the Sciara del fuoco, a lava flow began, which gradually increases its volume, forming a lava channel that extends along the Sciara until it reaches the coast, as evidenced by the light spot clearly visible from 10:10 UTC. The lava flow appears to cool around 4:00 p.m. UTC. On October 4, from 09:07 UTC, a new lava overflow is observed from the North crater which overlaps that of the day before. This overflow causes the lava material to roll along the Sciara del fuoco and remains confined to the upper part of the Sciara, cooling within hours.
Stromboli - image Sentinel-2 bands 12,11,8A dated 09.10.2022 / via Mounts Project - one click to enlarge
Lava overflow and pyroclastic flow of October 9, 2022 :
On October 9, 2022, at 07:21:44 UTC, an overflow of lava begins from the northern part of sector N2 which is followed at 07:21:54 by a fracture located on the outer cone of sector N2 at the interior of the Sciara del fuoco, former emission point of the
flow of October 3, a weak lava flow which begins to extend. At 07:22:42 a pyroclastic flow begins with the collapse of the edge of sector N2 overlooking the Sciara del fuoco. The flow propagates rapidly in about 30 seconds along the Sciara del fuoco, reaching the coast at 07:23:32 and spreading over the sea for a few hundred meters. The pyroclastic flow is immediately followed by a vigorously well-fed lava flow, developing into two main arms and spilling into the sea after a few minutes.
The activity is still ongoing
Source: INGV OE – weekly bulletin from 3 to 9,10,2022
Nevados de Chillan V.C. - photo archives 15.05.2022 / Joséfauna Biodiversidao - one click to enlarge
At Nevados de Chillan, the Sernageomin reports seismological activity during the month of September characterized by the recording of:
- 125 volcanotectonic earthquakes (VT) associated with brittle rupture processes; the most energetic earthquake had a local magnitude (ML) equal to 2.1, whose location was estimated at a depth of 4.0 km and at an epicentral distance of 4.8 km to the east-southeast of the active crater
- Long period (LP), explosion (EX) and tremor (TR) seismicity continued to be recorded, associated with fluid dynamics within the volcanic system. 629 LP-type earthquakes were classified, including 66 associated with surface-level explosions.
- After the explosive period, a decrease in the daily seismic energy of the fluids is observed in a similar way to what happened after the explosion of 09/29.
Nevados de Chillan volcanic complex - activity continues in October, with on 09.10.2022 / 7:26 p.m. local, pyroclastic flows - Cam. OVDAS Portezuelo - one click to enlarge
During the second half of September, the C.V. Nevados de Chillán continued with a prolonged pulsatile eruptive development in time, the ups and downs of internal activity and surface processes being recurrent. A decrease and absence of thermal anomalies in the crater area and a stabilization of the deformation have been identified, modifying the deflationary trend recorded since December 2021.
From geomorphological observations made on Planet Scope and Sentinel 2 L2A satellite images, it is observed that Dome 4 was growing until the middle of the month, associated with lava extrusion, which spatially coincides with the anomaly. of thermal radiation seen on Sentinel 2. L2A images in false colors.
However, during the second fortnight, an absence of thermal radiation is observed in the crater area towards the end of the month, interpreted as a partial obstruction of the surface feeding system. Note that the explosions that occurred on September 19 generated a partial destruction of Dome 4.
The technical alert is in Amarillo / Changes in the behavior of volcanic activity
Whakaari / white island - steam plume on 05.10.2022 - photo GNS Science / via GeoNet - one click to enlarge
Minor, passive ash emissions again occur intermittently from a recently formed active vent at Whakaari/White Island.
On October 5, 2022, volcanologists from GNS Science observed during a flight around the volcano that the vent emitted a strong plume of gas and steam almost vertically. The temperature of the gas and vapor plume was measured at 165 ºC. The web camera. North Rim captured views of steam and gas emissions and minor ash emissions. Sometimes the ash emissions obscured the camera, but the rain can clear the view. As the vent walls crumble, minor ash emissions occur.
Data from a gas observation flight last week measured a low sulfur dioxide release rate of 217 ± 19 tonnes/day. Observations from the TropOMI satellite, which images sulfur dioxide once a day, have shown no signal from Whakaari/White Island since Sunday 18 September.
The VAL remains at Level 2 (Moderate to Intense Disorder), acknowledging the current level of activity, but also continuing to recognize the greatest level of uncertainty in our interpretation due to the current lack of consistent and useful real-time data. The Aviation Color Code remains at yellow, reflecting a reduced likelihood of minor ash emissions.