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Earth of fire

Actualité volcanique, Articles de fond sur étude de volcan, tectonique, récits et photos de voyage

Publié le par Bernard Duyck
Publié dans : #volcanic activity
Santiaguito- abundant degassing on 09.05.2022 - photo Insivumeh

Santiaguito- abundant degassing on 09.05.2022 - photo Insivumeh

The Santiaguito Observatory reports abundant white outgassing at a height of 700 meters that propagates in a southwesterly direction, incandescence in the crater of the El Caliente dome and in front of the lava flow in a westerly direction and South West.

Weak and moderate boulder and ash avalanches continue to be recorded in the middle and front of the lava flow. Suspended ash is reported in the volcanic perimeter and at Finca El Faro and San José.

The volcano maintains high activity due to blocky lava extrusion into the Caliente dome in a west-southwest direction and unstable material within the crater, giving a likelihood of moderate to strong pyroclastic flows, with recommendation not to be in the barrancas of the volcano.

 

Source: Insivumeh

Sabancaya - activity from May 2 to 8, 2022 - Doc. I.G.Peru

Sabancaya - activity from May 2 to 8, 2022 - Doc. I.G.Peru

Last week, the eruptive activity of Sabancaya remained at moderate levels, with an average of 53 daily explosions, and plumes of gas and ash reaching up to 3,000 meters above the summit.

The IGP detected 324 earthquakes of volcanic origin associated with the internal circulation of magmatic fluids, and VT earthquakes, linked to the fragmentation of rocks.

The deformation, controlled by GNSS techniques, does not show any significant anomalies. Five thermal anomalies, with a maximum value of 58 MW, have been identified, associated with the presence of a lava body on the surface of the crater.

The volcanic alert is maintained in Naranja, with a non-accessible zone of 12 km radius around the crater.

 

Source: I.G.Peru

Etna - 09.05.2022 - an improved SO2 signal, 3.44 DU at a distance of 26.9 km from Etna - Doc. Tropomi/Sentinel5P/DLR/BIRA/ESA

Etna - 09.05.2022 - an improved SO2 signal, 3.44 DU at a distance of 26.9 km from Etna - Doc. Tropomi/Sentinel5P/DLR/BIRA/ESA

Etna - tremor at 10.05.2022 / 06h - Doc .INGV

Etna - tremor at 10.05.2022 / 06h - Doc .INGV

The tremor has increased slightly on Etna, and remains in the yellow/medium zone. There is also a slight increase in seismicity. There were several earthquakes that manifested to the northeast and southeast of the volcano. The strongest had a magnitude of 2.3.

Modis does not detect thermal anomalies.

Sentinel-5P/Tropomi detected detected an enhanced SO2 signal, 3.44 DU at a distance of 26.9 km from Etna.

LGS recorded a large number of infrasound events yesterday, indicating explosive outgassing. 1719 events were recorded at the MVT measuring station, for a maximum sound pressure of 0.79 Pa; 128 events were recorded at the ETN measuring station, for a maximum sound pressure of 0.43 Pa and were classified as weak. Most of the signals came from the direction of the central crater.

Etna - the summit craters - Photo Giò Giusa Aprile 2022 - one click to enlarge

Etna - the summit craters - Photo Giò Giusa Aprile 2022 - one click to enlarge

Access to the summit remains closed to individual travellers.
From the municipality of Nicolosi, the access ends at 2750 meters above sea level. The municipality of Belpasso authorizes an ascent up to an altitude of 2920 m. From April there is an exception for guided groups, who are allowed to ascend to the craters.

 

Source: INGV OE & LGS

Seamount Nootka - the 'Yellow Brick Road', a strange structure - doc. en.news.Yahoo

Seamount Nootka - the 'Yellow Brick Road', a strange structure - doc. en.news.Yahoo

A geological formation, within the Papahānaumokuākea Marine National Monument, a huge marine reserve that encompasses several islands in the northwest of the Hawaiian archipelago, was explored by the Ocean Exploration Trust expedition aboard the E/V Nautilus.

While diving on the top of seamount Nootka, the team discovered that the ocean floor here was oddly fragmented, in the form of perfectly rectangular bricks.

These are not the remains of an ancient civilization, but rather hyaloclastites produced when a lava flow comes into contact with water. This sudden cooling generates a thermal shock which will fracture the crystallizing rock.

The 90° fractures, visible on the screens, give the impression that they are bricks ... they are in fact the result of multiple eruptions, inducing several cycles of heating and cooling.

 

Source: Futuraplanet

the 'Yellow Brick Road' to Geologic Features of Liliʻuokalani Ridge Seamounts | Nautilus Live

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