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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

The eruptive activity that resumed on February 19, 2019 at Piton de la Fournaise around 7:10 pm local time continues. Despite some fluctuations, the intensity of the eruptive tremor (indicator of the intensity of the eruption) remains relatively constant.

Piton de La Fournaise - Evolution of the RSAM (indicator of the volcanic tremor and the intensity of the eruption) between 09h48 (05h48 UTC) on February 18th and 16h30 (12h30 UTC) on February 25th on the seismic station of FLR - Doc. OVPF.

Piton de La Fournaise - Evolution of the RSAM (indicator of the volcanic tremor and the intensity of the eruption) between 09h48 (05h48 UTC) on February 18th and 16h30 (12h30 UTC) on February 25th on the seismic station of FLR - Doc. OVPF.

Over the last 36 hours, 11 upper superficial volcano-tectonic earthquakes (above sea level) have been recorded.

After a deflation of the building related to magma transfer that occurred on 18/02/2019, the deformations of the summit zone do not show any particular signals.

The CO2 concentrations in the near field soil (volcano deposit area) remain high.

Over the last 36 hours, surface flows estimated from satellite data, via the HOTVOLC platform (OPGC - University of Auvergne), fluctuated between <1 and 13 m3 / s.

According to Mirova, the radiative power remains high, with 1927 MW this 25 February

Sources: OVPF & Mirova

Find all the information related to the Piton de la Fournaise activity on the different media of the OVPF-IPGP:
- the website (http://www.ipgp.fr/fr/ovpf/actualites-ovpf),
- the Twitter account (https://twitter.com/obsfournaise?lang=en),
- and the facebook account (https://www.facebook.com/ObsVolcanoPitonFournaise/)

 

Piton de la Fournaise - high radiative power this 25.02.2019 / 21:45 - Doc. Mirova Modis

Piton de la Fournaise - high radiative power this 25.02.2019 / 21:45 - Doc. Mirova Modis

News from La Fournaise, Karymsky and Californian volcanoes.

Explosions of ashes mark the activity of Karymsky, in Kamchatka, with this February 26 small plumes rising to 1,000-1,500 meters asl. moving east for 175 km.

The aviation code remains orange.

Sources: KVERT & VAAC Tokyo

Karymsky - photo A.Belousov / KVERT

Karymsky - photo A.Belousov / KVERT

The USGS / CalVO has just summarized the volcanic hazard exposure in California, a highly populated area especially on the coasts, with two major cities San Francisco and Los Angeles.

The volcanic history of California over the past 5,000 years suggests a 16% probability of another moderate to moderate eruption in the next 30 years. The threat ranking published by the US Geological Survey (USGS) identifies eight potentially active volcanic areas, classified as moderate, high or very high threat.

Seven on this "watch list" - Lake Volcano Medicine, Mount Shasta, Lassen Volcanic Center, Clear Lake Volcano Field, Long Valley Volcanic Region, Coso Volcano Field, and Salton Buttes - have deep magmatic roots and produce persistent low level seismicity, high temperature gas emissions, geothermal systems with hot springs and mud pools; they show deformations of the soil.

California Volcano Risk Summary Map - Doc USGS et al.

California Volcano Risk Summary Map - Doc USGS et al.

The first step in mitigating the volcanic hazard is to characterize the exposure: who is at risk? What infrastructures are in danger?

The results show that volcanic hazards may be more than a local problem, confined to a single county or region. A future eruption in northern California, for example, could have a negative impact on natural resources and important infrastructure for water supply, for transportation and energy systems, and will certainly require an effort to multi-jurisdictional intervention at the state level.

The next step in reducing volcanic risk is to assess the vulnerabilities of specific sites and sectors and to develop mitigation strategies. This will require the collective efforts of scientists, land managers, civil authorities, rescue line operators and communities.

 

Source: USGS et al. - https://pubs.usgs.gov/sir/2018/5159/sir20185159.pdf

News from La Fournaise, Karymsky and Californian volcanoes.

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