El Hierro volcano (Canary Islands) news & activity updates
New bathymetric studies published: the submarine cone is at 130 m depth
Fri, 20 Jan 2012, 09:1109:11 AM | BY: T
A long-awaited press release of the Spanish Government and the Oceanographic Institute was now published and presents the results of the latest bathymetric survey conducted last week by the crew on board Ramon Margalef , including the new bathymetric map of the new submarine volcano: the vent is now a depth of 130 m.
Bathymetry of the new submarine cone
Compared to the latest survey in November, when it had a depth of 150 m, this means that the cone has only grown about 20 m and most of the material erupted was used to build up the circumference and sediments around it. If the eruption continues at the rate it has been over the past months, it will probably take several years to breach the surface.
The latest surveys of Ramon Margalef also estimated that 145 million cubic meters of material was deposited on the seabed. The bathymetric surveys were carried out during 10-11 January. They have also allowed to see a significant increase in volume, both of the the cone itself and the deposits around it and inside the submarine valley.
The new deposits cover almost the entire western part of the submarine canyon where the vents are located. These deposits extend down to a depth of about 2,000 meters and are piled up in a narrow section of the canyon at 950 m water depth, which acts as a lock between 2 storage areas, the upper and lower submarine fan with coarser and fine-grained materials.
The scientists on board of the Ramon Margalef have estimated that the total deposits reached 57 million cubic meters of alluvial fan to a volume of 88 million cubic meters, which is 145 million cubic meters of material deposited.
As for the evolution of the volcanic cone, the Ramon Margalef found that the earlier split vent does not exist anymore and that the volcano displayed again a single peak at coordinates: 27º 37.18' N, 17º 59. 58' W.
Links / Sources:
Links / Sources:
- http://www2.gobiernodecanarias.org/noticias/index.jsp?module=1&page=nota.htm&id=146878 (Press release of the Government of the Canaries)
Thu, 19 Jan 2012, 17:11
Since yesterday, the activity at the El Hierro submarine volcano had been increasing, which could be seen on the harmonic tremor signal and the active jacuzzi above the vent on the ocean surface. The activity included strong bursts of harmonic tremor thought to be caused by hydromagmatic (magma-water) explosions. read all
Wed, 18 Jan 2012, 23:04
El Hierro (Canary Islands) photos - impressions from Nov 2011: landscape, villages, geologic and volcanic features
Some impressions from our recent visit to El Hierro Island while waiting for the eruption to become more vigorous... ... read all
Tue, 17 Jan 2012, 18:42
El Hierro volcano (Canary Islands), submarine eruption 2011-12 update: increased tremor and active bubbling at surface
Harmonic tremor signal 17 Jan 2012 (IGN) ... read all
Sat, 14 Jan 2012, 16:34
The eruption south of El Hierro is continuing, but has calmed down during the past days. In contrast to one week ago, there has been little visible surface activity at the stained area above the submarine vent near La Rrestinga. Volcanic tremor is at low, but constant levels, and indicates that lava continues to be erupted at depth. ... read all
Tue, 10 Jan 2012, 11:06
he eruption continues with little changes. The stain and jacuzzi above the submarine vent are active and a number of seaming hot lava blocks are arriving at the surface ("lava balloons"). Harmonic tremor is at constant and slightly higher levels than yesterday. ... read all