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The NORSAR Foundation has reviewed a large amount of data to find out whether the fatal landslide at Ask in Gjerdrum was triggered by an earthquake. The measuring station, which continuously monitors the movements of the earth in Norway, has been examined to see if there were any earthquakes on December 28, 29 and 30. The landslide occurred on the night of December 30.
– The conclusion is clear. We have analyzed large amounts of data and we can say that there was no decisive earthquake in the area prior to the clay landslide, says Anne Strømmen Lycke, Executive Director of NORSAR.
Did not knock out
It is true that two small earthquakes were measured at 10 and 13 on December 28, but these were too far from Ask to trigger any landslides, writes NORSAR. The landslide itself was also not recorded on the sensitive measuring instruments.
– We measure when something hits the ground. This landslide just resolved and disappeared and did not affect our instruments, Strømmen Lycke tells NTB.
– There were those who reported that they felt something between 1 and 1:30 at night when the landslide occurred, but there may have been a sentence in the area, it continues.
Often shaking
NORSAR writes that there are often smaller earthquakes in Romerike and that as many as 23 earthquakes with a magnitude of more than 2 have been measured in the area since 1979. The strongest occurred on November 19, 1994 when a magnitude 4 earthquake struck near Gardermoen. In the last five years, there have been no earthquakes stronger than 2.5 in the entire area.
– We discovered that we must offer the knowledge we have. There are regular earthquakes in this area of the Oslo countryside, but we did not believe that this was what had caused the landslide there, says the NORSAR director.
