Volcanic activity in Canary Islands 2022

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Partly Translated.

''The Island Action Plan for Volcanic Risk determines that the strip with the greatest danger due to volcanic eruption includes Santiago del Teide, Guía de Isora, El Tanque, Garachico, Icod and La Guancha, in addition to the Teide-Pico Viejo stratovolcano itself. The area with the highest probability of an eruption is the Abeque ridge, in the northwest of Tenerife
06/20/2022 in Cover, Uncategorized


VINCENT PEREZ

Some 60,000 people live in Tenerife in areas with a "high" or "very high" degree of "threat" of suffering the dangerous effects of a volcanic eruption, according to the zoning established in the Island Action Plan for Volcanic Risk, processed by the Council of Tenerife.

The area with "very high" threat covers the municipalities of Guía de Isora, Santiago del Teide, El Tanque, Garachico and part of Icod de los Vinos (including its urban area), a space inhabited by about 38,000 people, while it is «high» in the Teide-Pico Viejo stratovolcano itself, and in the rest of the Icod valley and La Guancha, a strip with some 22,272 inhabitants.

An area with "moderate" threat, in which the plan does not go into detail, would encompass the circle of Las Cañadas and would extend towards the valley of La Orotava to the coast, also including Los Realejos and Puerto del Cruz, while another 'low' threat zone would comprise the rest of the valley, its summit and Fasnia. The rest of the regions have a "very low" threat, including the Güímar valley, despite the fact that in 1705 it was affected by the eruption of the Siete Fuentes or Arafo volcano.

The plan concludes that "the most probable eruption will have as geographical context the axis of the northwest ridge of the island", based on the geological records of the last 30,000 years and, especially in the last 12,000, since During this last period (called the Holocene), the slopes of this ridge and the northern flank of Teide (including the Icod Valley) have been practically covered by lava flows.

La «amenaza volcánica», según el plan, está determinada por la probabilidad de que una erupción ocurra con un nivel específico de intensidad (o poder destructivo) dentro de un área concreta y un periodo de tiempo determinado. Este parámetro se suele descomponer en los diferentes peligros que pueden producirse durante el fenómeno eruptivo, entre los que destacan la circulación de las coladas, la caída de piroclastos, la dispersión de cenizas, los lahares (avalanchas de material volcánico), entre muchos otros.

El documento, presentado en el verano de 2021 por el gobierno del Cabildo, fue elaborado por la Cátedra Reducción del Riesgo de Desastres de la Universidad de La Laguna (ULL), en colaboración con el Instituto Insular de Atención Social y Sociosanitaria de Tenerife (IASS), Involcan, el Consejo Insular de Aguas de Tenerife, las áreas Medioambiente, Turismo, Movilidad, Carreteras, Agricultura y Ganadería, y el Consorcio de Bomberos de Tenerife. Se puede consultar en la siguiente web del Cabildo

: https://www.tenerife.es/portalcabtfe/es/...erife-paiv

The zoning of the threat that has been made in this plan, which was presented by the Cabildo in 2020, has been carried out taking into consideration the most important scientific studies that exist on the volcanic danger in Tenerife. Among the scientific works related to volcanic risk, this plan assumes the eruptive scenarios foreseen in PEVOLCA and takes as its main basis the flow model of lava flows carried out by the Geological and Mining Institute in 2006 for Tenerife, generated within the framework of the National Geological Risk Plan (PRIGEO) of the Geological and Mining Institute of Spain (IGME).

Based on all these studies, and taking into consideration topographical criteria (shadow areas versus lava flows) and territorial criteria in the delimitation of the areas (population and land use), a spatial zoning of the hazards is established, categorized in levels of threat: very high, high, moderate, low and very low.

The plan itself warns that "carrying out the evaluation of volcanic hazards in regions where knowledge of past volcanological history is poor, where detailed geochronological data are scarce, and where there is no historical eruptive activity of each of the scenarios is difficult and problematic", to which is added that "volcanism in our region is not currently associated with a single central building, as is the case in most of the world's volcanically active regions" but it is a volcanism essentially monogenetic, apparently distributed in a more or less dispersed manner over the territory, which makes volcanic monitoring and planning itself difficult.

The most probable eruptions are of the Strombolian type and are eminently effusive, such as that of La Palma, in which phases with the release of gases, ash and water vapor are combined explosively with other periods of emission of lava rivers.

Although seismicity is one of the dangers linked to volcanic activity, the plan contemplates it in its zoning "due to the high level of uncertainty" to determine the areas of the Island with the highest level of seismic threat as a result of the absence of detailed studies in this sense.

The document does not go into detail about what the evacuation would be like, but instead analyzes the degree of difficulty of the emergency for each zone: the existing ways to carry it out (in the case of Garachico, the possibility of having to use the port is contemplated, if the general coastal road will be cut), its greater or lesser population dispersion or the risk of forest fires.

The full article with photos and diagrams can be found on the link below.

https://planetacanario.com/peligro-riesg...NDNoEf7ozU

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https://external-lcy1-1.xx.fbcdn.net/saf...jsIjMG_jgl

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21/06/2020 - 21:00h Canary Islands. - Tenerife SWARM IS STILL STOPPING AND A REFLECTION OF THE PERipheral EARTHQUAKES OF THE IGN ARCHIPELAGUE: Earthquakes that are difficult to square, some earthquakes localized by the IGN are much more than that, this is an example, a distant Earthquake next to Madeira, from the distance with data that don't square or reverse, the truth is I pity the technician who has to put order in the EMSC. A 2.6 magnitude Earthquake that has been revised at 2.5 by the IMP and which the IGN Locates with a 4.1 magnitude and a GAP of 171, which is not so much (less than 200 is acceptable) with a similar depth, in that if they got it right.

Data from IGN:

es2022maopi 21/06/2020 00:55:14 02:55:14 32.1343 -16.7790 17.0 4.1 M(mb) ATLANTIC-WOOD

http://www.ign.es/web/ign/portal/ultimos...JCzIQUM0HQ

EMSC:
2022-06-21 00:55:16.0 32.10 N 16.73 W 15 km ML 2.6 M MADEIRA ISLANDS, PORTUGAL REGION IMP
2022-06-21 00:55:14.2 32.13 N 16.78 W 17 km mb 4.1 A MADEIRA ISLANDS, PORTUGAL REGION MAD

https://www.emsc.eu/Earthquake/alert/?id...nDvw0_P9aU

IPMA - Portuguese Meteorological Institute - IMP

2022-06-21 00:55:17 32.152 N 16.735 W 5 km 2.5 SW Deserts (Wood) IPMA
and in that zone two more in the zone of other days with less than a month, more efforts:
2022-06-10 18:35:25 32.239 N 17.008 W - 2.0 S Wolf Chamber (Mdra) IPMA
2022-05-27 02:49:16 32.216 N 16.338 W - 1.6 SE Deserts (Wood) IPMA

https://www.ipma.pt/pt/geofisica/sismici...TQV36y0Cso


If there's no comparison between earthquakes, I'll swallow it, it's worth it, but with the comparison of the IMP, how do we end up? .... same as you guys. Very thoughtful. They are different scales (one is ML and the other is mb), but so much... Will this be the new Canary scale or is it that "Spain is Different"? I'll leave this right there.

The swarm in Tenerife is stopping.

In Tenerife, small earthquakes continue to be seen on the seismograms, the swarm continues, and it's stopping, but none has been located at the moment. As for other data, I have been reported of a deformation of the ground in the North of the island, coinciding with the cesspool on the North Teide and the seismic swarm we have had these past few days.

https://www.ign.es/web/ign/portal/vlc-se...YZGUSLX49o

At first ends this seismic rebound, which gives us another notice more of something that started in 2004, followed with swarms in 2007 and 2010 and finally a renewed activity from 2016, 2017, 2018, 2019, 2020 2021 and now also in 2022... until the day it erupts, date we do not know, and it could be this year, (look at the Palma, it is organized in less than two weeks) or it could be next year in 2023... or in 2024... or in 2025... or more, you never know.

What if is that every year that passes the probability increases and the return period ended and already touches, I think seeing how the system is evolving we will see the mid-term eruption in less than 5-10 years, but it is a personal impression without nor There is no scientific basis of which only nature has the answer. Good evening and greetings. (Enrique)

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Update by IGN 17 mins ago.

Translated.

''Collapse on the north side of the Teide
The National Geographic Institute records on its surveillance network the seismic signal associated with the rockfall that occurred on the northern side of the Teide last Friday, June 17, 22.
It is the first time this phenomenon is confirmed with a seismic signal detected by an IGN station.
The graphic shows the detected motion 🧐
#IGNSpain #CNIG #Teide #Derrumbe #Ladera #mitmagob

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23/06/2020 - 20:45h Canary Islands. - HISTORY OF ACTIVITY REGISTERED IN TENERIFE. - DRUM SWAMMERS OR DRUMBEATS... - After the eruption of the volcano "Chinyero which began on November 18, 1909, and in which there was quite seismicity from 1908 and earthquakes of magnitude 4-5 on the island and after the eruption, calmed down and except some remarkable Earthquake there is no record d and more volcanic activity.
In the wake of the Iron eruption, the IGN has revised the seismic catalog to at least pull out a history of the most notable earthquakes in the past recorded and felt in official sources, such as newspapers, or chronicles, which allows place and assign an approximate magnitude to same ones, completing the seismic register. Don't miss the Earthquake Table with an assignment of 5.5 or more. on page 43 of the pdf, 41 of the document:

https://www.ign.es/web/resources/acercaD...8YchhpaxpI

Then from the 80s things change, I leave you a PDF of the IGN where it is talked about detecting volcanic seismic activity like the one we had last June 17, 2019.
1. - The first recorded swarm is in November 1980 and gives us a signal equal to the swarms of October 2016 and June 2019 in a sensor located in the Vilaflor area. I leave you a fragment of the report: (Enrique)

"The result of these campaigns, and in relation to the activity observed in recent years, it can be said that in November 1980, one of these stations was installed in the northern area of Vilaflor, the record of which can be seen in figure 6. In this recording you can appreciate a microsemic activity that started spontaneously, lasting only 5 days, recorded in a single station, and which we now know as a drumbeat type phenomenon. "

SOURCE:

https://www.ign.es/web/resources/volcano...0hfzd-qwwM

2. - More details registered of volcanic activity: Between 1992-2000: deformations of the terrain are located in the area of the Chio and del Chinyero volcano, with variations of up to 10 cm of what could be magma movements, which was not known n and god.... or yes, but there are no seismic records.

SOURCE:

https://web.archive.org/web/200406300011...mation.htm


3. - During April-May 2004 and beyond 2005 there was a seismic crisis in Tenerife with more than 200 earthquakes localized and more than 3000 registered, making an eruption forecast in October 2004 by the CSIC using the system of reverse d and the energy or seismic noise released, but the system stopped or the magma went elsewhere or it didn't have enough energy. It's hard to tell.

4. - between 2011 we had the eruption of the Iron, but that does not remove that there was swarm in Tenerife, which continued

5. - In 2015, we have small swarms, with signs very similar to the ones we had last June 18th and in the same area, which I echoed when I was still in AVCAN.

https://www.facebook.com/permalink.php?s...3883668446


6. - In October 2016 we have another swarm of these...

I'm still editing the post (Enrique)4. -