Canary Islands Government Raises El Hierro Volcanic Risk Level - PEVOLCA confirms subsea eruption - Red Alert issued for La Restinga

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Re: Canary Islands Government Raises El Hierro Volcanic Risk Level - PEVOLCA confirms subsea eruption - Red Alert issued for La Restinga

El Hierro Submarine Volcano Eruption

February 16, 2012


acquired

February 10, 2012 download large image (523 KB, JPEG, 1663x1663)

Four months after it began, the underwater volcanic eruption off El Hierro Island persists. This natural-color satellite image, collected on February 10, 2012, shows the site of the eruption, near the fishing village of La Restinga.

Bright aquamarine water indicates high concentrations of volcanic material. Immediately above the vent, a patch of brown water resembles a turbulent hot tub and indicates when and where the eruption is strongest. Video of the eruption shows the activity in more detail.

This image was acquired by the Advanced Land Imager (ALI) aboard the Earth Observing-1 (EO-1) satellite. The eruption is just off the southern coast of El Hierro, the youngest of the Canary Islands. El Hierro is about 460 kilometers (290 miles) west of Morocco and Western Sahara.

According to El Hierro Digital, measurements of the sea floor by the Instituto Oceanogr?fico Espa?ol found that the volcano?s summit is now only 120 meters (390 feet) beneath the ocean surface?10 meters (30 feet) higher than it was in mid-January. The height of the erupting cone is about 210 meters (690 feet) above the former ocean bottom, with a total volume over 145 million cubic meters (5.12 billion cubic feet) of new material.

1. References
2. El Hierro Digital. (2012, February 14). El IEO ha establecido la profundidad de la cima del cono principal de la erupci?n submarina en 120 metros Accessed February 14, 2012.
3. Instituto Oceanogr?fico Espa?ol. (2012, January 20). El cono volc?nico de El Hierro se encuentra a unos 130 metros de profundidad. Accessed February 14, 2012.

1. Related Reading
2. Instituto Volcanol?gico de Canarias

NASA Earth Observatory image by Jesse Allen and Robert Simmon, using EO-1 ALI data. Caption by Robert Simmon.


<DL><DT>Instrument: <DD>EO-1 - ALI</DD></DL>http://earthobservatory.nasa.gov/IOTD/view.php?id=77171

 

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Re: Canary Islands Government Raises El Hierro Volcanic Risk Level - PEVOLCA confirms subsea eruption - Red Alert issued for La Restinga

Scientists publish first video of the active submarine volcano at El Hierro (Canary Islands)

Saturday Mar 17, 2012 17:04 PM | Age: 18 hrs
BY: T



Screenshot of the video taken at the southwestern flank of the main submarine cone at 170 m depth, showing what looks like round lava bombs (or pillow lava?)

Scientists from the University of Las Palmas de Gran Canaria (ULPGC) aboard the research vessel Atlantic Explorer have published the first videos of the underwater volcanic cone in the Sea of ​Las Calmas south of El Hierro...

The preliminary results of the campaign are summarized as follows:
- For the first time, direct images of the new underwater volcano were obtained from locations at its southwestern flank and near the crater area (to 172 m). The vent itself seems to be at 120 m depth.
- The volcano continues to be active.
- Hot jets are formed from a vent at 120 m depth, forming convecting water cells reaching depths of about 40-60 m. On 13 March, the robot entered one of these cells and got caught in uncontrolled rotations while its thermal sensors showed a strong increase.
- Pyroclastic projections were observed to reaching about 40-50 m in height (i.e. the ejected pyroclasts reach depths of 80-70 m). Ejected bombs form (underwater) ballistic parabolic trajectories and fall back under gravity. Some of these pyroclastic seem to be large.
- During the dive on Wednesday (14 Mar), the southwest flank of the main cone was filmed. It has a steep slope and is composed mainly by large pyroclasts (see screenshot), some of which are similar to the hollow lava balloons that frequently reached the surface in the months of November and December.
...
http://www.volcanodiscovery.com/elh...rine-volcano-at-El-Hierro-Canary-Islands.html

Video:
<!--<a href="descarga.php?codigo_archivo=7094656" onclick='javascript:abrir_ventana_descarga("descarga.php?codigo_archivo=7094656");return false;' onkeypress='javascript:abrir_ventana_descarga("descarga.php?codigo_archivo=7094656");return false;' target="_self" class="" onmouseover="icono_archivo_7094656.src='imagenes2/video_small_color.gif'" onfocus="icono_archivo_7094656.src='imagenes2/video_small_color.gif'" onmouseout="icono_archivo_7094656.src='imagenes2/video_small_gris.gif'" onblur="icono_archivo_7094656.src='imagenes2/video_small_gris.gif'" > -->Robot submarino graba el flanco suroeste del cono principal del volc?n submarino
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<!--</div>--><!----><!--<a href="descarga.php?codigo_archivo=7094657" onclick='javascript:abrir_ventana_descarga("descarga.php?codigo_archivo=7094657");return false;' onkeypress='javascript:abrir_ventana_descarga("descarga.php?codigo_archivo=7094657");return false;' target="_self" class="" onmouseover="icono_archivo_7094657.src='imagenes2/video_small_color.gif'" onfocus="icono_archivo_7094657.src='imagenes2/video_small_color.gif'" onmouseout="icono_archivo_7094657.src='imagenes2/video_small_gris.gif'" onblur="icono_archivo_7094657.src='imagenes2/video_small_gris.gif'" > -->Filmaci?n de un banco de peces que convive con el volc?n submarino
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