Volcanos

Roundup of Global Volcanic Activity – Ongoing Activity for the week 13 July – 19 July 2022

Aira – Kyushu (Japan) : JMA reported that nighttime incandescence at Minamidake Crater (at Aira Caldera’s Sakurajima volcano) was visible during 11-18 July. Sulfur dioxide emissions were measured at 1,400 tons per day on 13 July. One explosion, recorded at 1852 on 17 July, produced an ash plume that rose as high as 2.8 km above the crater rim and ejected material as high as 1.1 km above the summit.

Great Sitkin – Andreanof Islands (USA) : AVO reported that slow lava effusion at Great Sitkin continued during 12-19 July. Elevated surface temperatures were identified in satellite images on most days; weather clouds sometimes obscured satellite and webcam views. Seismicity was low, and occasional local earthquakes were recorded.

Kama’ehuakanaloa – Hawaiian Islands (USA) : An earthquake swarm began at Kama’ehuakanaloa at about 0200 on 16 July and was characterized by seismic tremor accompanied by pulses of seismic energy every 15-20 seconds. The pattern of elevated seismicity continued through at least 1453 on 17 July, the posting time of the HVO’s information statement. The report also noted that around 24 earthquakes in the M 1.8-3 range were recorded during 0130-0600 on 17 July. The Scientist-in-Charge stated that the seismicity was likely the result of magma movement beneath the seamount, but there were no show signs of an imminent eruption. The most recent swarm was recorded on 11 May 2020 and consisted of 18 events in the M 3-3.9 range.

Karymsky – Eastern Kamchatka (Russia) : KVERT reported that a thermal anomaly over Karymsky was identified in satellite images during 7-14 July. At 2250 local time on 13 July ash plumes were identified in satellite images rising 10-11 km (32,800-36,100 ft) a.s.l. and drifting 360 km SW.

Kilauea – Hawaiian Islands (USA) : HVO reported that lava continued to effuse from a vent in the lower W wall of Kilauea’s Halema`uma`u Crater during 12-19 July, entering the lava lake and flowing onto the crater floor. The lake level was relatively low, though by 16 July it had risen to the bounding levees along the margins. Incandescence from the W vent complex was visible during 16-19 July. Lava oozed from the lake margins during the early morning of 19 July.

Krakatau – Sunda Strait : PVMBG reported that several eruptive events were recorded at Anak Krakatau during 16-18 July. Eruptions at 2253 and 2339 on 16 July, 0847 on 17 July, and 0826, 1549, and 1730 on 18 July produced dense gray-to-black ash plumes that rose 1-2.5 km above the summit and drifted NE, S, SW, and W. Webcam image acquired at 2308 and 2344 on 16 July showed incandescence at the vent.

Lewotolok – Lembata Island : PVMBG reported that the eruption at Lewotolok continued during 12-19 July. Daily white or white-and-gray emissions rose as high as 800 m above the summit and drifted in multiple directions. Photos in some posted reports showed Strombolian activity from the crater.

Manam – Northeast of New Guinea : The Darwin VAAC reported that on 14 July ash plumes from Manam rose to 2.1 km (7,000 ft) and drifted NW based on satellite and RVO webcam images.

Merapi – Central Java : BPPTKG reported that the eruption at Merapi continued during 8-14 July. The heights and morphologies of the SW and central lava domes were unchanged from the previous week, and seismicity remained at high levels. As many as 43 lava avalanches traveled down the Bebeng drainage on the SW flank, reaching a maximum distance of 2 km.

Pavlof – Alaska Peninsula, Alaska : AVO reported that a minor eruption at a vent on Pavlof’s upper E flank was ongoing during 12-19 July. Seismic tremor persisted and multiple daily explosions were detected in seismic and infrasound data. Elevated surface temperatures identified in satellite images on a few of the days possibly reflected ongoing minor lava effusion; cloud cover prevented views on most of the days during the week. Minor ash emissions were seen in webcam images during 18019 July.

Popocatepetl – Mexico : CENAPRED reported that each day during 12-18 July there were 8-39 steam-and-gas emissions rising from Popocatépetl that drifted SW and WNW.

Sao Jorge – Azores : A seismic swarm at São Jorge began at 1605 on 19 March along a WNW-ESE fissure system stretching from Ponta dos Rosais to Norte Pequeno – Silveira. The seismic data as well as deformation data indicated a magmatic intrusion, though by early April no significant deformation was detected. The frequency of earthquakes had decreased in late May-early June. Seismicity continued to be elevated; by 18 July a total of 43,410 low-magnitude tectonic events had been recorded.

Semeru – Eastern Java : PVMBG reported that the eruption at Semeru continued during 12-18 July. At 0614 on 14 July an ash plume rose 500 m above the summit and drifted SW.

Sheveluch – Central Kamchatka (Russia) : KVERT reported that the ongoing eruption at Sheveluch was characterized by explosions, hot avalanches, and lava-dome extrusion. A thermal anomaly was identified in satellite images during 7-14 July. Satellite images showed ash plumes drifting 82 km SW and SE during 11-13 July.

Suwanosejima – Ryukyu Islands (Japan) : JMA reported that the eruption at Suwanosejima’s Ontake Crater continued during 11-18 July. There were 13 explosions, producing eruption plumes that rose as high as 1.5 km above the crater rim and ejecting material 700 m from the vent. Crater incandescence was observed nightly.

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