On 9 and 10 September, earthquakes continued to be recorded at Bárðarbunga caldera with a M5.5 at 05:28 on the 10th in the northern part of the dyke intrusion, and also at Herðubreiðatögl. Lava was flowing into the Jökulsá á Fjöllum river, but there was no explosive reaction, only steaming. Continued sulphur dioxide emissions at the eruption sites prompted concerns about air quality in urban areas in eastern Iceland. According to GPS measurements, most of the magma flowing into the dyke was being erupted without further crustal deformation. Forecast scenarios now included references to possible further subsidence in the caldera prompting eruptions beneath the Dyngjujökull glacier.