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El Hierro vulkaan
schildvulkaan 1500 m
Canary Islands (Spain), 27.63°N / -17.99°W
Current status: normal or dormant (1 out of 5)
El Hierro webcams / Live-gegevens | Reports
El Hierro vulkaan boeken | Tours
El Hierro vulkaanuitbarstingen:
2012 (?) (probable second submarine eruption in June-July west of the island), 2011-12 (Oct-Mar, submarine eruption near La Restinga), 1793
Typical eruption style:
vooral uitbundig, basaltisch spleet erupties
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El Hierro volcano (Canary Islands) news & activity updates

El Hierro volcano (Canary Islands, Spain): increased area of upwelling muddy water and discoloration of sea water, but eruption not likely to form an island

Thursday Nov 24, 2011 10:22 AM |

The active area seen from the South coast.
The active area seen from the South coast.
Wide-angle view over the Las Calmas Sea showing both the active spot 1 km off the coast and another smaller one located 3 km off the coast (right in the picture)
Wide-angle view over the Las Calmas Sea showing both the active spot 1 km off the coast and another smaller one located 3 km off the coast (right in the picture)
Aerial picture of the zone (Guardia Civil, INVOLCAN)
Upwelling muddy water with foam and drifting discolored sea water
Upwelling muddy water with foam and drifting discolored sea water
Dark muddy water reaching the surface
Dark muddy water reaching the surface
Foam flattening the surface
Foam flattening the surface
The area of upwelling water above the new submarine vent(s) ca. 1 km off the south coast near La Restinga has increased. Muddy water and sometimes foam are visible at the spot, forming larger and smaller circular areas surrounded by greenish water drifting west. The activity occurs in irregular intervals of typically 20-40 minutes.
Another possible submarine vent is visible much further out to the SW, forming a separate greenish spot.
There are no rock fragments, no pumice and no steam visible.

In an interview with Canarias7, geologist José Luis Barrera from the Colegio Oficial de Geólogos (ICOG) expresses his opinion that the new volcanic cone, now roughtly 100 m high and located at 200 m depth, seems to have stopped its growth in height, which occurred in the first 14 days of the eruption. Any new erupted lava from this vent would find its way into submarine valleys around the base of the cone rather than building up at the top. To rise the cone, it needs first to grow in diameter and the volume required to make it grow in height exceeds what is likely to be produced in this eruption, which, - despite the occasional presence of rising mud and gasses at the surface,- seems to be waning.

Tremor is continuing, but the number of earthquakes at depth beneath the El Golfo area has decreased.
---
Koppelingen / Bronnen:
  • El volcán submarino de El Hierro no saldrá a la superficie, según los geólogos (Canarias7)
  • INVOLCAN (facebook)

El Hierro volcano (Canary Islands, Spain): probable new submarine vent observed

Monday Nov 21, 2011 19:50 PM |

The helicopter of Guardia Civil above the new submarine vent ca. 1 km offshore
The helicopter of Guardia Civil above the new submarine vent ca. 1 km offshore
Both areas of water discoloration are shown in this picture
Both areas of water discoloration are shown in this picture
The new active spot was clearly visible even from several km distance.
The new active spot was clearly visible even from several km distance.
Zoom onto the spot ca. 200-300 m away from the shore (note the red buoy for orientation)
Zoom onto the spot ca. 200-300 m away from the shore (note the red buoy for orientation)
Today, a new spot of upwelling water appeared at ca. 1 km distance off the south coast near La Restinga, near the location of the first submarine vent. Water discoloration, foam on the surface and flattened sea water were clearly visible in this area (see attached photos). We interpret that a new submarine vent is active there.
At the same time, the broadly circular area of upwelling water and greenish discoloration which we first observed on Saturday was also active, although less apparent than the other spot described above, and investigated by the helicopter of the Guardia Civil.

El Hierro volcano (Canary Islands, Spain): activity update: slight inflation in the north and continuing tremor, but no visible activity

Monday Nov 21, 2011 09:49 AM |

Tremor has decreased slightly, but earthquakes continue. No visible activity was present near La Restinga yesterday, but signs increase that something could be going on in the northern sector at depth, where part of the tremor has now been localized. Also, slight inflation is measured for the El Golfo valley.

The IGN summarizes yesterday's activity as follows (translated to English):

"The volcanic tremor was very irregular during the whole day (20 Nov) with numerous strong pulses. Starting around 17h00, the tremor decreased slightly. The analysis of the data revealed a significant second tremor source to the north of the island (in the El Golfo region).

Seismic events
On 20 Nov, there were 24 earthquakes, 4 of which were felt and had magnitudes of 2.7, 2.8, 2.9 and 3.7.
The largest of these (magnitude 3.7 on the Richter scale) was at 03h15 (UTC), localted 2 km off the coast and at 21 km depth. It could be easely felt here in Tigaday (Frontera).
The rest of the quakes were mainly clustered in the El Golfo area, aligned in NNW-SSE direction beneath the sea at depths of 15‐27km.
Felt earthquake list:
03h15, depth 21 km, magnitude 3.7
13h02, depth 20 km, magnitude 2.8
17h26, depth 27 km, magnitude 2.7 (east of Orchilla)
19h37, depth 22 km, magnitude 2.9
This makes a total of 11745 earthquakes since 17 July.

Deformation
The deformation measurements show stable values in horizontal directions, similar as in the past days. The stations in the El Golfo area show a slight vertical increase (inflation), while the other stations are showing slight deflation.
Visible observations
No surface activity was observed, nor discoloration of water in the area where upwelling was observed in the previous days."
---
Koppelingen / Bronnen:
  • RESUMEN DE LA ACTIVIDAD SISMO‐VOLCÁNICA EN EL HIERRO (IGN daily reports, published on 21 Nov 2011)

El Hierro volcano (Canary Islands, Spain): increase in tremor and signs of a possible new submarine vent near La Restinga

Saturday Nov 19, 2011 19:21 PM |

Increasing volcanic tremor (19 Nov), image courtesy IGN
Increasing volcanic tremor (19 Nov), image courtesy IGN
The new area of upwelling water, located ca. 300 m offshore (19 Nov)
The new area of upwelling water, located ca. 300 m offshore (19 Nov)
Zoom onto this area with flattened circular areas of the sea surface clearly visible (19 Nov)
Zoom onto this area with flattened circular areas of the sea surface clearly visible (19 Nov)
During our observations from near the south coast at La Restinga yesterday, we could not observe any activity at the surface of the water. This corresponded well with a sharp decrease in tremor measured by the Instituto Geográfico Nacional (IGN).
Today, we could see areas of the ocean surface flattened by likely upwelling water rising from below, at a much closer distance to the shore than the previously active vent area, at only about 300 m distance from shore and slightly to the east as compared to the former area. Volcanic tremor has increased significantly again. We suspect that a new vent might be forming or has formed in this area. Whether this leads to another "jacuzzi" or boiling water area is only speculation at this point. The situation remains interesting.
---
Koppelingen / Bronnen:
  • Volcanic Tremor (IGN)
Vorig nieuws
A brown spot is visible above the submarine vent.
Thursday, Nov 17, 2011
The volcanic tremor measured at El Hierro remains at very high levels and in sharp contrast to visible activity, feeding speculations and fear about new volcanic vents opening up somewhere on or near the island. Some fear such a new vent could be located in the El Golfo Bay, near Frontera, since most of the (deep) earthquakes in recent days are concentrated beneath the northern sector of the island. However, so far, these earthquakes are very deep (ca. 20 km) and do not point towards an immediate eruption in this area, rather are intrusions of dykes in the upper mantle beneath the island. ... [meer...]
Wednesday, Nov 16, 2011
Field observations at La Restinga at the southern tip of El Hierro have shown none or very little activity above the submarine vents during the past 2 days. Only a small brownish spot is present and the discolored sea water area seems to be getting significantly smaller. Likely, volcanic activity at the vent has stopped again. La Restinga town is very slowly recovering from its forced closure. ... [meer...]
Hot scoria floats to the surface above the vent (14 Nov afternoon)
Monday, Nov 14, 2011
Activity from the submarine volcano has restarted in the Las Calmas Sea south of La Restinga, El Hierro, from more or less the same submarine vent as last week. Today, steaming hot black lava blocks could be observed reaching the surface of the sea above the vent. A broad area of muddy discolored water drifts away from the site, and foam (or pumice) rings are formed around on the water. The stain of the sea has increased again and a number of dead or dying fish are seen in the harbor of La Restinga (open during daytime). [meer...]
The area of the submarine vent seen on Thursday.
Sunday, Nov 13, 2011
Since Wednesday, the submarine activity south of La Restinga is not producing much signs at the surface and seems to have stopped or continuing at much lower levels. A part of the VolcanoDiscovery team is now on location and we can observe the activity directly. Only occasionally, a weak brownish mud seems to reach the surface, sometimes accompanied by foam and / or pumice. It seems likely that the first vent has or is dying. ... [meer...]
Wednesday, Nov 09, 2011
There is a pause of the eruption at El Hierro. The activity from the submarine vents ca. 1 km south of El Hierro has decreased significantly, or even stopped completely today, scientists in La Restinga and the Guardia Civil reported. ... [meer...]

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