Katla volcano, located near the southern end of Iceland’s eastern volcanic zone, is hidden beneath the Myrdalsjökull icecap. The subglacial basaltic-to-rhyolitic volcano is one of Iceland’s most active and is a frequent producer of damaging jökulhlaups, or glacier-outburst floods. A large 10 x 14 km subglacial caldera with a long axis in a NW-SE direction is up to 750 m deep. Its high point reaches 1380 m, and three major outlet glaciers have breached its rim. Although most historical eruptions have taken place from fissures inside the caldera, the Eldgjá fissure system, which extends about 60 km to the NE from the current ice margin towards Grímsvötn volcano, has been the source of major Holocene eruptions. An eruption from the Eldgjá fissure system about 934 AD produced a voluminous lava flow of about 18 cu km, one of the world’s largest known Holocene lava flows. Katla has been the source of frequent subglacial basaltic explosive eruptions that have been among the largest tephra-producers in Iceland during historical time and has also produced numerous dacitic explosive eruptions during the Holocene.
Country: Iceland
Subregion Name: Mýrdalsjökull, Southern Iceland
Volcano Number: 1702-03=
Volcano Type: Subglacial volcano
Volcano Status: Historical
Last Known Eruption: 2011
Summit Elevation: 1512 m 4,961 feet
Latitude: 63.63°N 63°38’0″N
Longitude: 19.05°W 19°3’0″W
-
Map Key
Earthquake Markers
On the maps each coloured dot orb or marker represents an earthquake, the colours indicate the size range.
The epicentre of the earthquake event is at the base of the orb.Map Navigation
On the interactive maps clicking on an individual icon will open a small popup tag inside the map frame giving the detail information for that quake.
Once you have finished reading that tag you can simply click in the background map to close that tag and select another if you wish.
You can also move the map around inside the frame by clicking and holding down the left button of your mouse on the map itself, rather than having to use the up/down/left and right arrows.You can see the earthquake maps in various versions, ie map, satellite, terrain and even Google Earth.
At the bottom of each interactive map is text saying "see larger map". This will open a new page with the same map, but with the icons and magnitudes also as a list. The list is in a ascending time order. You can click on an icon on the map or a magnitude number on the list and a detail balloon (tag) will pop up on the map from the location of the event.
Google Earth Viewing
From here you can also click on the "View in Google Earth" button which will open the kml file in the real Google Earth rather than inside the Google Maps i-frame. This can be handy when you want to see multiple years events together.
You may have to zoom in on the map if you are looking for details of an icon that is in a cluster.
VOLCANIC TREMORS 
Leave a comment