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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 : #Actualités volcaniques
The Cuicocha-Cotacachi volcanic complex, with the Cuicocha caldera and its four domes - photo IGEPN

The Cuicocha-Cotacachi volcanic complex, with the Cuicocha caldera and its four domes - photo IGEPN

The IGEPN reports an increase in the seismic activity of the Cuicocha-Cotacachi volcanic complex in Ecuador.

During the days of October 2nd and 3rd, 60 VT earthquakes associated with rock fracturing were recorded; almost all earthquakes are located near the Cuicocha volcano. Ten earthquakes, the strongest of magnitude 2.5 occurred on October 2 at 10:58 local time, were reported as significant by Quiroga population.

The Cuicocha caldera, 3,500 meters wide, is occupied by a lake, which contains four domes forming two islands covered with trees. The last historical eruption dates back to the year 650.

Sources: IGEPN & Global Volcanism Program

Cuicocha volcano - location of the epicentres of the 10 most important VT earthquakes of 2-3 October 2018. - Doc. IGEPN

Cuicocha volcano - location of the epicentres of the 10 most important VT earthquakes of 2-3 October 2018. - Doc. IGEPN

Cuicocha volcano - number of weekly's earthquakes since 2014 to 03.10.2018 (far right) - Doc IGEPN

Cuicocha volcano - number of weekly's earthquakes since 2014 to 03.10.2018 (far right) - Doc IGEPN

At Piton de La Fournaise, the eruption started on September 15th at 4:25 am local time continues. The intensity of the volcanic tremor (indicator of the eruptive intensity on the surface) is in marked increase since the day of yesterday 22h local time (18h UTC) and has doubled of intensity since.

This increase could be related to the progressive closure of the eruptive cone, favoring a phenomenon of "resonance" more important. While gas pistons ("gas flushes" or "tremor burst") at the eruptive site are still recorded by the seismometers of the OVPF. These "gas pistons" mark a change of regime in the degassing of the eruption, and are generally observed when the quantity of available gas is exhausted, and often synonymous with a decrease of activity on the surface.
 

Piton de la Fournaise - Evolution of the RSAM (indicator of the volcanic tremor and the intensity of the eruption) between 04h00 (00h UTC) on September 15th and 16h00 (12h00 UTC) on October 4th on the FOR seismic station, located nearby Castle Fort crater (2000 m altitude on the southeast flank of the terminal cone). - Doc. OVPF

Piton de la Fournaise - Evolution of the RSAM (indicator of the volcanic tremor and the intensity of the eruption) between 04h00 (00h UTC) on September 15th and 16h00 (12h00 UTC) on October 4th on the FOR seismic station, located nearby Castle Fort crater (2000 m altitude on the southeast flank of the terminal cone). - Doc. OVPF

No volcano-tectonic earthquakes were recorded during the day of October 3, nor during the current day.

Inflation (swelling) of the building, witnessing the influence of a source of pressure at the foot of the volcano, is still perceptible.

Surface flows estimated from satellite data, via the HOTVOLC platform (OPGC - Clermont Auvergne University) are between 1 m3 / s and 3 m3 / s over the last 24 hours.

The observations made yesterday at the end of the day and today by OVPF teams indicate a very weak surface activity, the lava projections inside the cone are rare and disperse over a very short distance and no major resurgence from the main tunnel was visible.

Sources:

- OVPF-IPGP

Find all the information related to the activity of Piton de la Fournaise on the website (http://www.ipgp.fr/fr/ovpf/actualites-ovpf), the Twitter account (https: // twitter. com / obsfournaise? lang = fr), and the facebook account (https://www.facebook.com/ObsVolcanoPitonFournaise/) of the OVPF-IPGP.
The information in this document may not be used without explicit reference.

- Video of Cédric Norman, whom I thank for sharing.

Great pictures of the eruption by Ced Norman taken 10 days after the volcano woke up - to see in HD and big screen

Piton of La Fournaise - 04.10.2018 / 14h32 - IRT webcam - OVPF

Piton of La Fournaise - 04.10.2018 / 14h32 - IRT webcam - OVPF

Two beautiful explosions at Popocatépetl this October 4, including one at 7:37, in addition to 173 exhalations; the plume with an estimated height of 1,000 meters above the summit has tilted westward. Ash fallout is possible on San Pedro Nexapa, Amecameca, El Salto, San Antonio Zoyatzingo and San Diego Huehuecalco.

At the seismicity level, 2 volcano-tectonic earthquakes of M 1,5 and 2,4 and 358 minutes of harmonic tremor were recorded.

This activity remains within the framework of the alert Amarillo fase 2.

Sources: Cenapred & Segob

Popocatépetl - 04.10.2018 / 7:37 am and 7:48 am - explosion and plume loaded in ashes - one click to enlarge - webcamsdeMexicoPopocatépetl - 04.10.2018 / 7:37 am and 7:48 am - explosion and plume loaded in ashes - one click to enlarge - webcamsdeMexico
Popocatépetl - 04.10.2018 / 7:37 am and 7:48 am - explosion and plume loaded in ashes - one click to enlarge - webcamsdeMexico

Popocatépetl - 04.10.2018 / 7:37 am and 7:48 am - explosion and plume loaded in ashes - one click to enlarge - webcamsdeMexico

Kilauea East Rift Zone by Mick Kalber ... "This morning was our first day of visiting the eruption site without the ISF in place, which prevented us from flying below 3,000 feet ..."

In the East Rift Zone (ERZ) of Kilauea, no significant incandescence was visible during the night of October 2 in the cone of fissure 8. Minor fumes from the cone were visible during the past day. Webcam images of fissure cone 8 show that part of the crater wall near the north weir zone has been slowly displaced in the last 2 weeks, indicating some cone instability in this area .

Seismicity and soil deformation remain low at the summit and at the Kilauea ERZ.

Seismicity has not changed in the past week.

Sulfur dioxide (SO2) emission rates at the top,  Puʻu ʻŌ'ō and the ERZ are significantly reduced; the combined rate is less than 300 tonnes / day, the lowest sustained emission rate since before 1983. Small amounts of hydrogen sulphide gas (H2S) are emitted at the top, at Pu'u'Ō'ō, and in the lower ERZ 

Source: HVO-USGS

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