By 18:42 on 27 August there had been two earthquakes in the caldera above M5 and about 1300 events in the range of M2-3 around the tip of the dyke which had propagated a further 1 km to the north and now extended some 13 km past the edge of the glacier. Approximately another 20 million cubic metres of magma had entered the dyke over the previous 24 hours. The intrusion of the dyke was now causing stress changes over a large area to the north of the dyke's extent. A M4.5 event was recorded just east of the Askja caldera, which had been showing signs of increased geothermal activity since April 2012. At 20:50, scientists on a surveillance flight reported a 4-6 km line of 10-15 m deep cauldrons to the south of the Bárðarbunga caldera, which were possibly a result of melting or a sub glacial eruption, although they didn't know when they had formed. No heightened tremor level was observed.