Volcanic activity in Canary Islands 2021

[jand]

[jand]

Comments from Volcano y ciencia hoy


Hello, Enrique. One question (or to whoever knows): Why do you have to ′′ review ′′ the magnitude of earthquakes? I mean, what's the reason that the first measure isn't always valid?
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Volcanes y Ciencia Hoy - Volcanoes and Science Today.

Gisela Burunat There's an automatic system that locates them to give a quick system. Then you have to reprocess the data manually to better tune that calculus into seasons that capture it well and remove the worst ones that capture it for a better result. So some should go up and others should go down... incomprehensibly with IGN they only go down and when they see it shows a lot, they come back up. I really don't understand those IGN reviews much. (Enrique)



Mike Hayward
We need to break the chair is what keeps it there seismology and volcanology, play in the same direction as low frequency movements or VT marks us where the magma moves, tell that the Great Earthquakes can not be predicted but if you can tell that due to precursor movements anticipate you to a big one, as some large earthquakes precede them, the so called slow earthquakes and then there is the so-called light of the Earthquake or LIGHTQUAK3, then there are the Subduccion that simply releases the energy, al overlapping a plate under another until it can't hold and like a rubber spring Salta, because in volcanic activity, volcanology and seismology complement each other very well, because low-frequency movements are the form of warning that has a volcanic to warning that an eruption is coming, precursor signs or those movements for a few years have served as a warning to anticipate an eruption.
I leave you a picture as it is a volcano (MIK3)
PICA PICA is going to make you wiggle a lot, take care of you.

[jand]

They locate 21 earthquakes in the area of ​​the eruption, two of them felt
The maximum magnitude recorded is 3.6 (mbLg) corresponding to the Earthquake felt with maximum intensity in the epicentral zone at 2:13 p.m. yesterday

The National Geographic Institute has located in the last 24 hours a total of 21 earthquakes in the surroundings of the eruption of the Cumbre Vieja volcano, two of them felt by the population.

The maximum magnitude recorded is 3.6 (mbLg) corresponding to the Earthquake felt with maximum intensity in the epicentral area at 2:13 p.m. yesterday, according to information provided by the IGN.

Two earthquakes have also been located at depths of around 30 kilometers and a shallow Earthquake in the area near the eruptive mouth .

According to the IGN data, the volcanic tremor signal maintains its stable level at levels similar to those of the previous days in a range of average values ​​with respect to those observed since the beginning of the eruption.

The height of the column of ash and gases emitted by the eruption, measured at 7:30 am today, is 4,500 meters, a value slightly lower than the previous day.

In addition, the network of permanent GNSS stations on the island show a return to stability in deformations.

The IGN monitors volcanic activity and has strengthened the surveillance network on La Palma, where it has established an Eruption Attention and Surveillance Center and works daily to collect samples of volcanic material for analysis.

https://www.canarias7.es/canarias/la-pal...ente&vli=_

[jand]

Landslide on the west side of #LaPalma due to tremors, October 1st..

#LaPalma #Spain
#Hawaii #eruption #volcano #Espana #lava #Kilauea #LasPalmas #VigilanciaLaPalma #Canarias #CanaryIslands #volcan #CumbreVieja #LaPalmaeruption


https://twitter.com/i/status/1444179435675168773

[jand]

Informative update: From 15:00 p.m. (Canary Time) today, October 2, 2021, the Canary Seismic Network on the island of La Palma records a rebound in the extent of the volcanic tremor related to a increase in Strombolian type explosive activity.

[jand]

When an eruption is going to take place , it is announced, generally by a more intense release of vapors and by seismic shocks , more or less intense earthquakes . It begins with the projection of the solidified lava culotte, broken into a multitude of fragments. But it also happens, sometimes, that the crater changes and that the eruption occurs at another point on the surface. A column of smoke, made up of dust and lava, water vapor and various gases, rises from the volcano , sometimes reaching heights of up to 11,000 meters . During the night, the volcano is illuminated by the reflections of the incandescent lava.

Most volcanoes issue various types of warnings before the eruption begins. Although a volcanic eruption can occur without any prior signal, it is most likely that certain Events will warn us of the next eruption. The magmatic eruptions , for example, involve the output of the magma to the surface and this upward movement normally generates earthquakes detectable, can deform the surface of the earth and cause changes in temperature and chemical composition of the soil and spring water. The people who live

near volcanoes you can detect some of these Events before an eruption. Both the frequency and intensity of earthquakes tend to increase before they start. They can also be preceded by fumarolic activity and by new or larger areas of warm soil .

However, most of the precursor changes are too subtle to notice, and it is essential to use the most effective means of monitoring the volcano , including a wide range of geophysical, geodetic and geochemical techniques. Seismographs are used to detect and locate tremors related to the rise of magma. Other techniques include measuring changes in heat flow in the volcano . Changes in the composition or relative abundance of fumarolic gases can also precede volcanic eruptions and can be detected through frequent gas analysis.


These techniques can be helpful in spotting warning signs of an impending rash. However, the overall success of a surveillance system depends on detecting and interpreting precursor signs early enough to warn and evacuate people from threatened areas and initiate other measures to mitigate the effects of the eruption. Although these monitoring systems can be useful to indicate an increase in the probability of volcanic activity and its location, they do not indicate the type or scale of an impending eruption, nor the Volcanic Explosivity Index that it will reach. Before the Tambora eruption In 1815, for at least 6 months and perhaps up to three years before, some of these signs had occurred, such as increased fumarolic activity and small phreatic eruptions, but no one could imagine what would happen: the eruption reached an IEV of 7, causing, among other things, the year without a summer in 1816 . The precursor signs can persist for weeks, months or even years before the volcanic eruption begins or they can subside at any time and there is no eruption. Thus, monitoring volcanic precursors can give us a general warning of the increased likelihood of volcanic activity in a given area, but it will not tell us when the eruption will be or if, in fact, such a volcanic eruption is going to occur.

Let's see what are these manifestations that precede a volcanic eruption and that allow us to take action if we know what to do in the event of a volcanic eruption :

The rise of magma causes earthquakes . The slow ascent produces a progressive increase in the intensity and frequency of these tremors. This process can begin months before the eruption.
The rise of the magma also causes subterranean noise in the area in which the volcano is located. These noises can be dull or dry, like something breaking.
If there is frost or ice, it breaks, until it melts due to the effect of heat.
There is an increase in temperature in the waters near the volcano and in the soil, which can cause the death of the vegetal mantle.
The animals can behave abnormally, to perceiving vibrations that we can not grasp.
It is possible to see fumaroles , and if these already existed, there is an increase in the emission flux and even changes in color can be perceived.
Deformations occur in the volcanic building. Your pulsations can be measured and determined using a tilt meter .
When the eruption is imminent, there are small explosions and ash emissions, which increase in intensity and frequency as the moment in which the volcano finally erupts approaches.


https://www.rincondelvago.com/informacio...IVrnVGZxg0

[jand]

Update from Mike Hayward Volcanes y ciencia hoy

''Good morning to todo@s hope you were able to rest as much as possible. We are still in the same dilemma yesterday, since 01;00 we appreciate many explosions generated by the volcanic by that mix of water and magma, and we have a great move, which could be those explosions or hybrid VT movements, and that magma Follow the picnic to pop the Sill. What is the chair? Because of ancient eruptions are created under the volcano a series of layers that with the years between an eruption and another solidifies, and is compact or part of the lithospheric layer below contains minerals or rocks that form that layer and it is complicated to promote ascend.
Then we go to the unidentified movements, there's a big swarm if it can be micro seismicity and what? They're important there are like 300 untraced and if I count them more than 4000 low frequency moves if we count this previous week, the volcano re-ups energy and the tremor increases with a spamodic tremor. There are no catastrophes there are bad decisions (MIK3)''

[jand]

Mike Hayward

Lo sé Enrique y yo estábamos siguiendo el proceso hicieron un naranja en cubierto,lo se de sobra incluso el sismo de disparo fue a las 11:02 les hubiera dado tiempo suficiente ...pero((De amarillo a rojo) y no llevábamos días viendo la erupción venir semanas...y ni siquiera tenían planes de emergencias,2 días antes,el día antes y en amarillo había rally.No habia puntos de encuentro el plan de emergencias se hizo un o dos días antes por que no había...eso lo que Enrique y yo desde hace años hemos luchado,por que haya transparencia educación sísmico volcánica,simulacros buenos planes :Ante contingencia volcánica donde entra :GASES CENIZAS,hemos escrito mucho sobre esto hemos hablado sobre esto,no se si habrás leído alguno de los post que hicimos Enrique y yo hace 3 años ,es una pena espero que hayan dimisiones tenéis que lucharlo la vulcanología y la sismología es una ciencia inexacta pero hay las llamadas señales precursoras,Sismo de disparo por ejemplo o que la actividad sísmica empieza a ser somera,marcando VT (Volcano Tectónicos) híbridos y los más importantes los de baja frecuencia. Un saludo (MIK3)


Mike Hayward
I know Enrique and I were following the process they made an orange in cover, I know plenty even the shooting Earthquake was at 11:02 would have given them enough time... but (((yellow to red) and we hadn't been days watching the eruption come weeks... and they didn't even have emergency plans, 2 days before, the day before and in yellow there was rally. There were no meeting points, the emergency plan was made a day or two before because there was no... that what Enrique and I have struggled for years, for transparency education volcanic seismic, drills good plans: Ante volcanic contingency Where it enters: ASH GASES, we have written a lot about this we have talked about this, I do not know if you have read any of the post we made Enrique and I 3 years ago, it is a shame I hope there are resignations you have to fight the volcanology and the seismology is an inaccurate science but there are so-called precursor signs, shooting Earthquake for example or that seismic activity starts to be somera, marking hybrid VT (Volcano Tectonic) and the most important low-frequency ones. Greetings (MIK3)

[jand]

https://www.ign.es/web/ign/portal/vlc-se...2&tipoSP=2

[jand]

Just used Google earth to look at Cumbre Vieja if all those vents erupted at once I can understand why there is concern that  a landslide may start a Tsunami.


https://earth.google.com/web/search/cumb...fhw54OO1XA