Minor earthquake swarm in Katla volcano

Over the past two days minor earthquakes have been taking place in Katla volcano. This is just minor earthquake activity. None of the earthquakes so far have reached the magnitude 1,0 that I know of.

Earthquake activity in Katla volcano. Copyright of this image belongs to Icelandic Meteorological Office.

What is interesting about this earthquake activity is that it is taking place inside the caldera of Katla volcano and it is taking place in high winter. When earthquake activity is normally low. What this means is unknown as is and I do not think an eruption is imminent in Katla volcano. This activity is however something to keep an eye on. Since Katla volcano is known to have erupted as early in May. Last such eruption took place in the year 1721 and lasted until October that same year (+-45 days). It is not known if eruptions can take place earlier, I am not going to rule it out even if it is not documented in historical documents about past eruptions in Katla volcano.

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Minor earthquake swarm in Hengill volcano

Yesterday (16-February-2014) an minor earthquake swarm took place in Hengill volcano. This earthquake swarm took place because Orkuveit Reykjavíkur (OR) was pumping down water from hydrothermal processing in this part of Hengill volcano.

The earthquake swarm in Hengill volcano yesterday. Copyright of this image belongs to Icelandic Meteorological Office.

This type of earthquakes happen regularly when Orkuveita Reykjavíkur pumps water down into the ground at this location. At the moment this is just making minor earthquakes. This type of earthquake swarm only last during the period when water is being pumped down into the ground. Once that process is stopped the earthquake activity stops almost immediately.

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