Asamayama (Japan) – Report for 7 August-13 August 2019

JMA reported that at 2208 on 7 August a small phreatic eruption at Asamayama produced an ash plume that rose higher than 1.8 km above the crater rim and drifted N. Blocks were ejected 200 m from the crater. The eruption lasted about 20 minutes and was the first since 19 June 2015. The Alert Level was raised to 3 (on a scale of 1-5). Ash fell in Tsumagoi Village and Naganohara Town, in the Gunma Prefecture. White plumes rose as high as 700 m above the crater rim during 8-13 August, and the amount of sulfur dioxide released was 90-200 tons per day.

Source: Japan Meteorological Agency (JMA)

Shishaldin (United States) – Report for 7 August-13 August 2019

AVO reported that during 7-13 August continuous, low-level tremor at Shishaldin was recorded by the seismic network and elevated surface temperatures were visible in satellite images. The Aviation Color Code remained at Orange and the Volcano Alert Level remained at Watch.

Source: US Geological Survey Alaska Volcano Observatory (AVO)

Slamet (Indonesia) – Report for 7 August-13 August 2019

PVMBG reported that seismicity at Slamet significantly increased beginning in June, with 51,511 signals indicating emissions and 22 tectonic earthquakes recorded through 8 August. White plumes with variable density rose as high as 300 m above the crater rim.Tremor began to be recorded at the end of July with gradually increasing amplitude. In addition, notable inflation was detected at the end of July and long-term temperatures of hot springs showed an upward trend. The Alert Level was raised to 2 (on a scale of 1-4) and the public was warned to stay outside a radius of 2 km.

Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)

Tangkubanparahu (Indonesia) – Report for 7 August-13 August 2019

PVMBG reported that during 5-11 August phreatic events at Tangkubanparahu’s Ratu Crater continued to produced sometimes dense, gray-to-white plumes that rose as high as 200 m above the vent and ash plumes rose as high as 100 m. The emissions were accompanied by roaring. Ashfall was localized around Ratu Crater. The seismic network recorded continuous tremor. The Alert Level remained at 2 (on a scale of 1-4), and the public was warned to stay 1.5 km away from the active crater.

Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)

AVO Cleveland YELLOW/ADVISORY – Seismicity increased; weakly elevated surface temperatures in satellite images

Aug 14, 2019 20:04 – Slightly elevated surface temperatures observed in partly cloudy satellite images over the past day. Web-camera views were obscured by clouds. Seismicity has increased slightly with a swarm of discrete earthquakes. No activity was detected regional or local infrasound data.

Episodes of lava effusion and explosions can occur without advance warning. Explosions from Cleveland are normally short duration and only present a hazard to aviation in the immediate vicinity of the volcano. Larger explosions that present a more widespread hazard to aviation are possible, but …

Stromboli: Activity high

The activity at Stromboli is still high. The LGS Florence reported yesterday about strombolian explosions ejecting the tephra more than 200 m high. The day before, the eject height was reported to be more than 300 meters. While these eruptions take place in the northeastern crater area, lava continues to flow from the northwestern sector. 2 lava flows move in the upper part of Sciara del Fuoco and reached a height of 600 m above sea level the day before yesterday. At that time MIROVA registered thermal radiation with a power of 133 MW. Yesterday the value was reduced to 22 MW. Today there are no usable measurements due to clouds. On the thermal cam of the LGS you can see that the lava flows have become very short and only little lava flows. But for at least 24 hours the slope in the summit area of the volcano has been increasing: The magma accumulates in the conveyor system. The tremor is still clearly elevated, which also indicates that there are magmatic fluids inside the volcano.