Yesterday morning, another lava flow formed at Stromboli, spilling from a vent in the northeastern crater sector. Similar to previous episodes, there were no significant changes in geophysical parameters leading up to the increase in activity, except for a rise in tremor amplitude. The accompanying graph shows a corresponding peak reaching into the lower red range, although it didn’t reach the value of the previous episode, which was accompanied by a stronger explosive eruption. Photos document that the current episode was also marked by lively Strombolian activity and lava spattering. The activity began increasing during the morning hours. By noon, the lava flow was only 100 meters long. Rock avalanches originated from its front.
Eruptions
News about eruptions and volcanoes can be found in this category. It is updated frequently. Volcano expert and journalist Marc Szeglat reports live from his expeditions to volcanoes.
Lava dome at Mayon is growing
Mayon volcano on Luzon island in the Philippines remains active, building up its lava dome. It has produced three lava flows, the longest of which has traveled a distance of 3.4 km. These flows follow the channels of Bonga, Mi-isi, and Basud. Yesterday, seven pyroclastic density currents were reported, covering a distance of up to 4 km. Additionally, 201 debris avalanches were recorded. An ash eruption was also observed, sending volcanic ash up to an altitude of 3000 m.
The seismic network of PHILVOLCS detected 100 volcano-related earthquakes. Among these, 58 were tremor phases caused by magma movements underground. Some of these tremors lasted up to 13 minutes, suggesting that the volcano does not intend to decrease its activity in the near future.
Gas emissions reached 1888 tons per day yesterday, which is a significant amount. Steam rose up to 800 m above the height of the dome.
Overall, ground deformation due to magma inflation is being observed. However, in the eastern part of the volcanic area, the opposite trend of deflation is occurring. It’s likely that the magma erupting at the dome currently originates from this sector.
Mayon is an active stratovolcano located on the island of Luzon in the Philippines. It is known for its nearly perfect cone shape and is one of the most iconic and picturesque volcanoes in the country.
Fuego erupts ash up to 5200 m altitude
In Guatemala, the Fuego volcano has become more active again compared to the past few weeks. Today, the VAAC issued a VONA warning stating that volcanic ash has risen up to an altitude of 5200 m. The wind has carried the ash cloud in a western direction, leading to ashfall in the communities in that direction.
The volcanologists from INSIVUMEH released their observations in a daily update yesterday. They reported 5 to 8 eruptions per hour on the previous day, with ash clouds reaching an altitude of up to 4700 m. The ash has shifted up to 15 km to the west, causing light ashfall in areas such as Finca Palo Verde, Sangre de Cristo, San Pedro Yepocapa, and Acatenango.
Karangetang with numerous rock avalanches
The dome in the southern crater of the Indonesian volcano Karangetang continues to grow, and numerous rock avalanches are occurring, leaving glowing traces in nighttime images. There are also signs of a sluggish lava flow making its way down the southern flank. On long-exposure photos, the glowing traces of the rock avalanches are not always distinguishable from lava flows. A daytime image shows bluish gas emissions emanating from the flank, indicating a lava flow. A satellite photo from August 1st reveals two thermal anomalies in the infrared range, possibly originating from lava flows. The distinction between rock avalanches and lava flows is uncertain here as well.
Larger explosion and lava flow at Stromboli
Yesterday evening at 7:06 PM, an explosive eruption occurred, which was stronger than the everyday eruptions at Stromboli. This is indicated by a report from INGV. The entire crater terrace was covered with tephra. However, according to current knowledge, there were no impacts of larger blocks or bombs on Pizzo or along the Cima, where tourists were previously allowed. In connection with the explosion, two lava overflows also occurred from the northern crater area. The lava fronts quickly reached the upper part of the Sciara del Fuoco. Similar lava overflows had already been observed in the past few days. At that time, the activity was accompanied by lava spattering. I already pointed out last week that lava flows on Stromboli usually form in phases. During such phases, there is also an increased danger of stronger explosions and paroxysms, which can even generate pyroclastic flows extending to the sea.
Stromboli erupts short lava flow
In the last few weeks, the liparic island volcano Stromboli has shown its charming side, delighting tourists with its daily eruption show, visible from the two viewpoints at 290 and 400 meters above sea level, with the higher viewpoint accessible only with a mountain guide. Yesterday, the show took a new turn as another component was added: a lava flow began to move on the outer side of the crater towards Sciara del Fuoco. The activity was accompanied by intense tephra ejections from at least 2 vents in the northern crater area. Such lava overflows are often accompanied by lava spattering and occur in phases. Occasionally, during these events, dangerous pyroclastic flows can be generated, flowing all the way to the sea.
Fagradalsfjall: Expected eruption in Iceland has begun
Around 4:20 PM (local time), a approximately 200-meter-long eruption fissure opened near the Fagradalsfjall volcano. The fissure is located northeast of the volcano in a place called Litli Hrútur, which has been considered as a possible eruption site in recent days. The Icelandic Meteorological Office (IMO) recommends not to go there immediately and wait for the experts’ approval. There is no full closure of the area yet.
The current eruption appears to be initially small, but it is unclear how it will develop. Previous eruptions in 2021 and 2014 started similarly modest but later intensified significantly.
The terrain behind Fagradalsfjall is flat, and there are no valleys for the lava to fill. The lava flows with a weak slope towards Fagradalsfjall, where it will encounter a volcanic elevation that acts as a natural obstacle. If the slope is balanced, the lava could flow northwards.
In the evening, two more short fissures opened in the vicinity of the first eruption fissure, slightly offset to the side. I estimate their total length to be about 350 meters. The first fissure opened precisely on a jeep track.
There are reports of evacuated hikers from the eruption area. Roadblocks are being set up, and the previously announced restricted area around the eruption site is being established.
Paroxysm at Etna volcano on 21.05.23
Early this morning, the tremor at Mount Etna in Sicily increased sharply. Residents of Andrano, in the southwest of the volcano, reported loud explosion sounds, clanging windows, and ashfall. As the eruption progressed, it became clear that a paroxysm from the New Southeast Crater had begun. The eruption ended shortly before 12 noon. The dense clouds gave only a brief glimpse of a lava fountain. Two days before the eruption the Tremor increased and some ash puffs were visible.
Fuego paroxysm on 05.05.23
The phase of increased activity at Fuego that began yesterday escalated into a paroxysm. Volcanic ash rose to an altitude of 7600 m and drifted 200 km to the west. The ash cloud posed a danger to air traffic. Lava fountains shot several hundred metres into the air and a lava flow passed through the Ceniza Gorge, creating debris avalanches. Last, but not least, pyroclastic flows went off. They flowed through the Seca y Santa Teresa gorges to the west of the volcano. The national road RN 14 was closed and the Civil Protection CONRED ordered the evacuation of more than 1000 people from five villages near the volcano.
Shiveluch on Kamtchatka erupts
On Russia’s Kamchatka Peninsula, Shiveluch continues to be active, ejecting high rising ash clouds associated with the generation of pyroclastic flows. According to the Tokyo VAAC, volcanic ash reached an altitude of 9,500 m this morning and is spreading over a large area to the southeast of the volcano. It is very likely that further ash precipitation will occur in the village of Kljutschi, where heavy ash precipitation already occurred after the initial ignition of the volcano, covering the entire village with a brown layer of ash, causing massive problems and bringing public life to a standstill. In the meantime, it is said to be up to 20 cm thick. It must be removed from house roofs as soon as possible, because when it gets wet, the ash turns into a layer that weighs tons and can cause roofs to collapse. Since it is still winter on Kamchatka, precipitation will first fall as snow, which can be removed along with the ash. With the onset of snowmelt, however, lahars may then form on the volcano.