Activity of Sheveluch, Kilauea and Shishaldin.

The explosive-effusive activity of Sheveluch continues, with this 29th of September a plume of ashes at 3,500-4,000 meters asl. drifting southeast over 100 km.

The aviation code remains orange.

Sources: KVERT, Mirova & VAACTokyo

In Kilauea, the small lake, which appeared in July in the crater of Halema'uma'u 600 meters below the edge of the crater, continues to grow and deepen.

These 24-25 September, photos show a size close to that of a football field, a length of 110 meters over 50 meters wide.

Although no eruptions are in progress, areas where the soil temperature is constantly high and where little gas is released are still near the cracks in the rift zone below 2018. These include steam. , very small amounts of hydrogen sulfide and carbon dioxide. These conditions are expected in the long term. Similar conditions followed the 1955 eruption for years, if not decades.

Since the beginning of March 2019, GPS stations and inclinometers at the Kīlauea summit have recorded a deformation corresponding to a slow accumulation of magma in the shallow part of the Kīlauea summit magma system (1 to 2 km below ground level). ). However, gas measurements still need to indicate a significant decrease in magma. The HVO continues to carefully monitor all data flows at the Kīlauea Summit to detect significant changes.

Since the beginning of March 2019, GPS stations and inclinometers at the Kīlauea summit have recorded a deformation corresponding to a slow accumulation of magma in the shallow part of the magma system of the Kīlauea summit (1 to 2 km or about 1 mile under the ground level). However, gas measurements still need to indicate a significant decrease in magma. The HVO continues to carefully monitor all data flows at the Kīlauea Summit to detect significant changes.

Further east, the GPS stations and inclinometers continue to display movements consistent with the slow filling of the East Rift Zone magma reservoir in the vast area between Pu'u'Ō'ō and Highway 130. suggest no imminent change in volcanic risk in this region. In addition to the movement along the eastern rift zone, Kīlauea's southern flank continues to move offshore after the M6.9 earthquake on May 4, 2018 near Kalapana. The HVO continues to carefully monitor all data flows along the Kīlauea East Rift Zone and south flank to detect significant changes. after the earthquake M6.9 of May 4, 2018 near Kalapana. The HVO continues to carefully monitor all data flows along the Kīlauea East Rift Zone and south flank to detect significant changes.

Source: HVO

The AVO reduced the alert level of Shishaldin in the eastern part of the Aleutian Islands to advisory and the aviation code to yellow on 26th September following the drop in seismicity and temperature that suggest a withdrawal of the magma.

A collapse of the crater floor may have occurred around September 19, according to Tiltmeter data.

Source: AVO