ROV video posted by ULPGC-QSTAR (see post # 2183 above):
SOS Oceanos comments on their campaign:
ROV underwater video of El Hierro volcano - 4th ULPGC-oceanographic expedition aboard QSTAR R / V Atlantic Explorer
Researchers from the School of Marine Sciences, University Institutes attached to IUSIANI (Division of Robotics and Computational Oceanography) and Oceanography and Global Change (planktonic Ecophysiology Group and Physical Oceanography and Applied Geophysics), developed by oceanographic called Guayota 4-ULPGC for the study of underwater volcano of El Hierro and oceanographic effects.
This campaign has had the collaboration of the American University RUTGERS (Jersey) and was carried on board the oceanographic vessel Atlantic Explorer (QSTAR SLU) between days 2 and 3 June 2012.
The first day a dive with an underwater robot (ROV Sirius, AGEOTEC) was made for observation and filming of the oceanographic environment of the volcanic cone also trying, as far as possible, to film the geological structures associated with the volcanic cone area.
Scientists point out that in the area of the volcanic cone there is no stain in the ocean's surface, but bubbling surface areas at the coordinates of the crater, and the ROV and the ship's echo sounder recorded evident degassing zones on one flank of the volcano . At depths greater than 50-60 meters, fly ash is detected, which also appeared in samples of zooplankton (possibly removed by the heavy swell of the previous days).
Furthermore, no trace could be found in fish mortality and yes we continuously had seagulls in the surrounding areas with no apparent change (presence of coastal pelagics in the area). The presence of two different species of fish, amberjack juveniles in surface and coastal pelagic (still unidentified) attracted to light at depths greater than 120 m above the cone is recorded.
On the afternoon of June 2 there were two oceanographic stations where vertical profiles of temperature, salinity and fluorescence with a CTD (Conductivity-Temperature-Depth) were made , taking water samples at different depths with a rosette of six bottles and zooplankton sampling with a WP-2 network. The stations chosen were one located far from the volcanic cone in the southeast of the island of El Hierro for reference and the other was in the vicinity of the volcanic cone.
On June 3 a total of 9 stations CTD and rosette to obtain vertical profiles of salinity, temperature and fluorometry, in addition to water samples at different depths in the submarine volcano oceanographic environment was completed. In general, thermohaline anomalies have not seen to be relevant in the area of the volcano.
It is generally observed conditions of late spring that a seasonal thermocline develops above 50 m depth at stations closer to shore with a maximum of fluorescence due to an increase in chlorophyll over 70 meters.
What I observed were bubbles of different sizes rising from the depths in the area of the volcano, same as the day before that disrupted the reading of the ship's echo sounder. In the same CTD stations zooplankton from 0-200m were sampled, splitting the sample into four size classes for the study of biomass and metabolic activity of zooplankton. Also, together with CTD stations sampling the water column 0-125 meters in 3 seasons, and for the determination of chlorophyll, metabolism and carbon fluxes due to phytoplankton. In general, one could say that there is a recovery of the area, with increased phytoplankton biomass and zooplankton.
So far there have been 4 oceanographic and geological features in the region affected by the submarine volcano Restinga (El Hierro) from February 2012 to the present with the oceanographic vessel Atlantic Explorer. These campaigns are being funded largely by the University of Las Palmas de Gran Canariay and by different research groups which have been participating such as Departments of Physics, Chemistry and Biology, Faculty of Marine Sciences, Institute of Oceanography and Global Change Institute of Intelligent Systems and Numerical Applications in Engineering (IUSIANI), Research Center for Biodiversity and Environmental Management, and Marine Biotechnology Center (MBC).
In addition, institutions such as the Oceanographic Centre of Canary Islands (Spanish Oceanographic Institute), the National Research Council (CSIC), Rutgers University (USA) and researchers from other national and foreign are collaborating in these campaigns.
Re: Tirelessly updating Avalon on the El Hierro eruption.
From Wikipedia: A Harmonic tremor is a sustained release of seismic and/or infrasonic energy typically associated with the underground movement of magma and/or venting of volcanic gases from magma. Being a long-duration continuous signal from a temporally extended source, a volcanic tremor contrasts distinctly with transient sources of seismic radiation, such as tremors that are typically associated with earthquake and explosion.
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