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Slide 15 of 18
Notes
We also see that station SOHO, red curve, is moving southwards more rapidly than other
stations in the vincinity. SOHO, the station we saw a photo of
earlier in this presentation, is located just 5 km SW of the subglacial
calderarim of Katla. The movement occurs sporiodically with this offset
here in the summer of 2001 (4 mm) lasting for about one or two
months. Then it's relatively flat (I don't know what this perturbation
there means) and then it goes off again in April this year and continued
until mid-November. This movement is most probably caused by an increase in
magma pressure under Katla. This is supported by GPS network
measurements made on nunataks on the caldera rim. The results imply a
shallow Mogi source at a depth of some 2.5 km with a center rise of
11 centimeters between June 2001 and May 2002. (Therefore the movements
are not caused by reinflation of Hekla Magma chamber) .....