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.

Merapi: new dome growth

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On the Indonesian website krjogja.com it is reported that the Merapi has entered a new phase with dome growth. This information comes from Agus Budi Santoso, the head of the Merapi Volcano section at the BPPTKG. The new intrusion is the 7th phase since the beginning of the eruption and is accompanied by explosive activity and deep seismic. The larger eruptions in the first half of the year would have more than halved the volume of the lava dome to 200,000 cubic metres. Now it looks as if the dome is getting bigger again, increasing the potential danger.

Nishinoshima: Eruption increased

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The Japanese island volcano Nishinoshima continues to make headlines. The VAAC issued numerous VONA warnings of ash clouds. Currently volcanic ash is registered at an altitude of 7300 m above sea level. Since the cinder cone is only a few 100 m high, this represents a remarkably large eruption cloud. The peak value yesterday was 4200 m and was described in Japanese media as the highest ash cloud since the beginning of the eruption. The thermal radiation yesterday had a power of 1860 MW and is therefore also in a very high range. So lava flows are still being produced, which will change the face of the island forever. Nishinoshima is growing and growing. Radar images show that not only the coastline is constantly shifting, but also the cinder cone with the explosive crater is subject to major changes. It looks as if a major collapse has occurred in the south of the cone. Probably the collapse was caused by a new lava flow.

Iceland: Is a volcanic eruption imminent?

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The Icelandic volcanologists of the Institute IMO express concern about the current situation on the Reykjanes Peninsula. In the vicinity of Grindavik, there have been repeated swarm quakes in recent months, which were quite strong. Since 21 January, GPS measurements now show a rise in the ground that has not been seen there for decades. Under the volcano Þorbjörn the ground is rising by 3-4 mm per day. This rise is caused by magmatic fluids rising under the volcano. In all probability it is magma that causes Þorbjörn to rise. As a result, the civil defence has declared the VONA warning level “yellow”. Residents of the area will be invited to an information meeting tomorrow. There they will be informed about how to prepare for a possible volcanic eruption.

Campi Flegrei: Tremor amplitude increases

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While all eyes look at the Philippine Taal volcano, there is also something interesting going on under the European pedant Campi Flegrei. The INGV Napoli yesterday published a new report on the situation of the large caldera volcano, which can erupt at a similar rate as the Taal. The focus of the report is the thermal area around the fumarole of Pisciarelli , which is located on the north-western crater rim of the Solfatara. There one can observe an increase in the tremor amplitude. Although it is primarily a fumarolic tremor, which occurs at a depth of less than 1 km and is therefore in the area of the hydrothermal system, it also represents the overall state of the magmatic system of the caldera. The volcanologists see a correlation between changes in the geochemistry of the fluids, the soil deformation with peaks of 60 cm uplift and the fumarolic tremor. Therefore, it is quite possible that the Caldera volcano is slowly preparing for an eruption.

Taal: Seismic high, SO2 low

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The situation on the Taal is still exciting. Yesterday and today the VAAC registered one ash cloud each, whose ascent heights could not be determined. The seismic activity is still high. The Taal network recorded 486 tremors in the last 24 hours. The strongest one had a magnitude of 2.7 and was not noticed by local residents. The seismic activity is probably caused by rising magma. The ground deformations are correspondingly large. Especially in the southwest and north of the caldera there are ground elevations which are probably related to the inflation of magmatic fluids. In the eastern part of the caldera, however, the ground has been sinking.

Sulphur dioxide emissions are disproportionately low, at only 224 tonnes per day. One would expect at least 10 times the current value. Philippine volcanologists speculate about plugs in the production vents that prevent the gas from escaping. However, such plugs would not only block the sulphur dioxide, but also impair the entire gas exchange. The result would be an enormous increase in pressure in the earth’s interior. Alternatively, the soil deformations could not be caused by magma, but by other fluids. Water would be one possibility. This would also be an answer to the question where the disappeared water of Lake Taal has gone: Last week the lake level dropped a few centimetres.

Etna: Summit activity continues

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The activity of the volcano Etna on Sicily (Italy) continues and is even worth seeing, as the video below demonstrates. The intracrater cone of Voragine is strombolian active and continues to grow slowly. From a vent on the lower flank of the cone a lava flow is flowing, which splits into 2 arms. They flow into the neighbouring crater Bocca Nuova and form a rare lava fall there.

From the technical point of view the eruption manifests itself in an increased tremor and moderate thermal signals. MIROVA registered radiation with a power of 44 MW. In addition, the INGV thermal imaging camera now shows 2 hot spots in the area of the New South East Crater. It looks as if another vent has become active there.

Taal volcano erupted

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On 12 January, the eruption began with phreatic explosions, which then increased rapidly. A violent eruption caused ash clouds to rise into the stratosphere. The eruptions manifested from the main crater of Volcano Island, which is located in the middle of the Taal caldera. The ash not only rained down in the immediate vicinity of the volcano, but even reached the capital Manila. The airport was closed.

In various places, house roofs collapsed, which could not withstand the weight of the ash. The following day, lateral vents opened on the flank of Volcano Island. These generate smaller eruptions. PHILVOLCS also reported short lava flows of highly viscous lava.

The eruption was announced by numerous earthquakes. Their frequency increased in the last weeks and reached peak values of 140 quakes per day. Shortly before the eruption the magnitude of the earthquakes increased and reached M 4.0.

The authorities reacted quickly and ordered evacuations. A 14 km long exclusion zone was established. It largely encloses the Taal Lake, which is located in the caldera.

Translated with www.DeepL.com/Translator (free version)

Etna: Activity increases

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The activity on Etna in Sicily seems to be slightly increasing again. The LGS registered sounds that could be caused by explosive activity with its infrasonic microphones and issued an “early warning” of level yellow. Visual confirmation of the activity was provided in the form of images posted by Dr. Boris Behncke of the INGV. They are similar to what we last saw of the volcano in December. There is an active vent in the Voragine that supports glowing tephra. Small ash clouds rose from the New South East Crater and the Northeast Crater. MIROVA registers weak to moderate heat radiation. The tremor is normal.

Anak Krakatoa: New eruptions

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The Indonesian island volcano Anak Krakatau continues to be explosively active and produces volcanic ash. The VAAC Darwin reports ash at 2400 m altitude. MIROVA recorded a weak thermal anomaly with a power of 3 MW and seismic activity is elevated. Unfortunately, there are no longer any usable LiveCam images, because the ash erupted yesterday has soiled the camera.

The VSI recorded 18 seismic signals caused by explosive eruptions. The longest lasted 62 minutes. Harmonic tremors were also recorded. Already at the beginning of the month the earthquakes increased with a low frequency and indicated that magma was moving underground. Further eruptions can be expected.

The eruptions started on 29 December 2019, and initially the volcano increased its activity and erupted phreatic. In the evening, glowing tephra and volcanic ash was also produced.

Nevados de Chillan: Pyroclastic flow

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The Chilean volcano Nevados de Chillan is very active and produces several explosive ash eruptions daily. The volcanic ash penetrates up to altitudes of 5000 m. At least one of these eruptions produced a small pyroclastic flow yesterday. After an explosion, it rushed down the northern slope of the volcano. The explosion emanated from the lava dome, which is called “Gil-Cruz”. The dome began to grow in January 2018. A few months later it was partially destroyed by a series of eruptions. Meanwhile it seems to have recovered well. SERNAGEOMIN keeps the VONA status on “orange”.