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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
 Klyuchevskoy - 07.03.2020 / 07h56 - Webcam of IVS FEB RAS, KVERT - Частота кадров: 1 кадр / 1 мин

Klyuchevskoy - 07.03.2020 / 07h56 - Webcam of IVS FEB RAS, KVERT - Частота кадров: 1 кадр / 1 мин

In Kamchatka, the Klyuchevskoy continues its moderate explosive eruption, characterized by Strombolian activity and gas and vapor emissions.

During the last night, a recording of the webcam lasting 10 hours shows, like the satellite images, a nice thermal anomaly. Incandescent avalanches are noticed for 3-4 hours.

Aviation code stays orange.

 

Sources: KVERT, VAAC Tokyo and Mirova

Klyuchevskoy - thermal anomalies on 07.03.2020 / 02h05 - Doc. Mirova_MODIS_VRP

Klyuchevskoy - thermal anomalies on 07.03.2020 / 02h05 - Doc. Mirova_MODIS_VRP

March 6/7, 2020, ~ Extreme Activity ~ Klyuchevskoy Volcano, Russia / You can speed up or slow down with the video controls provided by YouTube.

On Big Island, Kilauea and Mauna Loa are NOT erupting.

The alert levels and aviation code are respectively for Kilauea: normal / green - for Mauna Loa: advisory / yellow.

The USGS provides us with its weekly sighting reports.

Big island and its volcanoes - The lava flows that have occurred over the past 200 years, shown in red, indicate the location of the Big Island rift zones. - Doc. Hilo u

Big island and its volcanoes - The lava flows that have occurred over the past 200 years, shown in red, indicate the location of the Big Island rift zones. - Doc. Hilo u

For the Mauna Loa volcano, the deformation and seismicity rates have not changed significantly over the past week and remain above long-term background levels.

HVO seismometers recorded around 70 small magnitude earthquakes under the higher altitudes of the volcano. Most of these events occurred at shallow depths less than 5 km (~ 3 miles) below ground level.

Separately, a flurry - totaling around 70 small earthquakes so far - has occurred just south of the northeast rift zone of Mauna Loa, where known fault structures generally produce shallow seismicity.

The strongest earthquake in Mauna Loa recorded during this period was a 3.7 magnitude event in the early hours of February 28. This earthquake was located approximately 10 kilometers (~ 6 miles) northeast of Hawaiian Ocean View Estates, in an area where earthquakes of similar magnitude normally occur several times a year.

Global positioning system (GPS) measurements show continued slow top inflation, consistent with magma supply from the volcano's shallow storage system.

Gas concentrations at the sulfur cone monitoring site in the southwest rift zone remain stable. The temperatures of the fumaroles measured both at the sulfur cone and at the top did not change significantly.

Comparison of the water pond in Halema‘uma‘u on November 20, 2019, and March 1, 2020. Camera and lens same for both photos. Since November 20, 2019, the pond deepened 10 m (33 ft) and widened more than 50 m (164 ft) east-west and 30 m (98 ft) north-south. Circled clusters of rocks did not move between photos, evidence of slope stability. The water's color browned with time, though the photos probably exaggerate the color difference. The blue-green water at the far and near ends of the pond is interpreted as groundwater entering the pond. - USGS photos by D. Swanson.

Comparison of the water pond in Halema‘uma‘u on November 20, 2019, and March 1, 2020. Camera and lens same for both photos. Since November 20, 2019, the pond deepened 10 m (33 ft) and widened more than 50 m (164 ft) east-west and 30 m (98 ft) north-south. Circled clusters of rocks did not move between photos, evidence of slope stability. The water's color browned with time, though the photos probably exaggerate the color difference. The blue-green water at the far and near ends of the pond is interpreted as groundwater entering the pond. - USGS photos by D. Swanson.

For Kilauea, monitoring data for February shows variable but typical rates of seismicity and soil deformation, low rates of sulfur dioxide emissions and only minor geological changes since the end of activity eruptive in September 2018.

The pond of acid water at the bottom of Halema'uma'u continues to expand and deepen slowly. In early March, the dimensions of the pond were approximately 100 meters by 200 meters. The current depth is around 28 meters.

In the past month, the summit inclinometer recorded about 9 deflation-inflation events, a number similar to January. Since March 2019, GPS stations and inclinometers at the top of Kīlauea have recorded a deformation consistent with a slow accumulation of magma in the shallow part of the magma system at the top of Kīlauea (1-2 km or about 1 mile below level of the ground).

 

Farther east, GPS stations and inclinometers continue to show movements compatible with a slowed-down filling of the deep magmatic reservoir of the East Rift zone in the vast region between Puʻu ʻŌʻō and route 130. In February, the rates of deformation in this region have decreased slightly. Monitoring data do not suggest any imminent change in the volcanic danger for this area.

Although not currently erupting, areas of high and persistent ground temperatures and minor gas releases are still in the vicinity of the cracks in the lower east rift zone 2018. These include steam (water), very small amounts of hydrogen sulfide and carbon dioxide. These conditions are expected to remain long term.

 

Source: HVO / USGS - Hawaii Volcano Observatory

Hike to the top of crack 8 / Kilauea eruption of 2018 - Video Copyright © 2020 Apau Hawaii Tours

The unrest continues at the Great Sitkin, with a volcanic advisory alert and aviation yellow code.

The seismicity of the Great Sitkin was slightly elevated for much of the past week. On Friday March 6, 2020 at 6:31 a.m. AKST (3:31 p.m. UTC), a relatively large and shallow magnitude 3.5 earthquake occurred 1 km from the summit. Since then, seismicity has returned to levels comparable to those recorded at the start of the week. Although this earthquake represents a significant increase in the seismic activity of the volcano, it does not mean that an eruption is imminent. There has been no evidence of activity in the satellite data over the past week, although sightings have been limited by cloud cover.

 

Source: AVO

Great Sitkin - AVO archives 06/18/2019 / 5:52 p.m. AKDT- photo Laura Clor / AVO

Great Sitkin - AVO archives 06/18/2019 / 5:52 p.m. AKDT- photo Laura Clor / AVO

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