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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 - 05.07.2022 / 11:33 p.m. - column of ash at the lava front, from San Marcos Palajunoj, note the top of the Caliente dome and the lava flow on its left. -Doc. Insivumeh - one click to enlarge

Santiaguito - 05.07.2022 / 11:33 p.m. - column of ash at the lava front, from San Marcos Palajunoj, note the top of the Caliente dome and the lava flow on its left. -Doc. Insivumeh - one click to enlarge

At Santiaguito (Guatemala),a period of high extrusive activity in recent months has built up a blocky lava flow, which begins in the upper part of the southwest flank of the Caliente dome and moves along the San Isidro channel.

Today, this lava flow has an approximate length of 3385 meters. The topology or shape of this lava flow is dominated by unstable stacked blocks, both in its upper part and in its lateral edges and frontal part, which, when collapsing, can frequently cause avalanches and flows pyroclastics with weak to moderate characteristics, conducive to incandescence and the emission of fine ash easily moved by the wind.

Simultaneously, during the previous months, constant degassing, weak explosions and avalanches of moderate to strong characteristics were generated from the dome of the Caliente Dome.

This level of activity is expected to continue in the coming weeks and the possibility of further material collapses and the lava flow increasing its lateral and vertical dimensions is not excluded. So also weak to moderate explosions which produce degassing and columns of ash at 3500 meters altitude.

The Insivumeh recalls the ban on approaching the 5 kilometer restriction zone around the domes of Santiaguito; it asks the Municipality of El Palmar to grant the necessary maintenance to the suspension bridges that cross the Nimá I, Nimá II and San Isidro rivers, which represent access and evacuation routes to and from the work areas agriculture of the inhabitants of the municipality.

 

Source: Insivumeh, special volcanological bulletin of 05.07.2022 / 7:39 p.m. local time.

Fuego - lava flow towards the barranca Ceniza on 05.07.2022 / 2:48 p.m. - Insivumeh webcam - one click to enlarge

Fuego - lava flow towards the barranca Ceniza on 05.07.2022 / 2:48 p.m. - Insivumeh webcam - one click to enlarge

The effusive activity in the Fuego volcano has decreased on July 5, however it still maintains a lava flow 200 meters in length towards the Ceniza ravine. . During the last hours, the activity in the crater generated weak, moderate and some strong explosions accompanied by a weak shock wave and abundant ash columns with heights of 4,800 meters above the level of the sea ​​(15,748 feet) which are scattered to the west and southwest of the volcanic complex, at a distance of about 30 kilometers. Ash falls are reported in the communities of Santa Sofía, Morelia, Panimaché I and II, El Porvenir and others in these directions.

Seismic and acoustic monitoring parameters, as well as observations made in the field by observers from the Fuego Volcano Observatory (OVFGO) indicate that the lava flow will disappear in the next few hours or days. However, it should be taken into account that there is always the probability of sudden increases in activity in the coming days or weeks, which could generate more lava flows in other ravines, prolonged periods degassing and moderate to strong avalanches in one of the canyons.

It is also necessary to consider the rains which generate high values ​​of precipitation around the Fuego volcano, because they remobilize the material previously deposited in the ravines. Therefore, all necessary precautions must be taken, mainly in the afternoon and at night, when the lahars descend.

 

Source: Insivumeh, special bulletin of 05.07.2022 / 4:37 p.m. local time

Sabancaya - activity from 27.06 to 03.07.2022 - Doc. I.G.Peru

Sabancaya - activity from 27.06 to 03.07.2022 - Doc. I.G.Peru

The eruptive activity of Sabancaya, in Peru, has remained at moderate levels this past week (June 27 to July 3, 2022), with an average of 22 daily explosions, accompanied by plumes of gas and ash up to 2,200 meters above Summit.

The I.G.P. detected during this period 305 earthquakes of volcanic origin, associated with the circulation of magmatic fluids, and VT earthquakes related to rock fracturing.

No significant deformation anomalies.

Ten thermal anomalies, with a max. of 41 MW, have been identified, associated with the presence of a dome in the crater.

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

 

Source: I.G.Peru

The Kilauea measurement campaign will be done as in January 2021, where a helicopter carried an airborne electromagnetic induction sensor over parts of northeastern Wisconsin as part of a USGS study aimed at to map the aquifers of the region. - USGS photo - one click to enlarge

The Kilauea measurement campaign will be done as in January 2021, where a helicopter carried an airborne electromagnetic induction sensor over parts of northeastern Wisconsin as part of a USGS study aimed at to map the aquifers of the region. - USGS photo - one click to enlarge

The U.S. Geological Survey is conducting a helicopter geophysical survey of unpopulated portions of Kīlauea Volcano on the island of Hawaiʻi July 5-25, 2022. Data will be collected with a 50-by-80-foot horizontal oval-shaped loop suspended 100 feet below a helicopter flying approximately 115-165 feet above the ground or treetops.

The data will be used to image the shallow (600 meters or 2,000 feet upper) magmatic structure, fault systems and subterranean waterways above Kīlauea.

The survey aircraft will not fly over or collect data from residential areas or other regions excluded by Federal Aviation Administration regulations or Hawaii Volcanoes National Park policies.

 

Source: USGS

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