In the following days, the eruption in Holuhraun continued at a similar rate, accompanied by ongoing earthquakes. The caldera continued to subside with regular M5 earthquakes each day. Regions experiencing reduced air quality changed depending on wind direction. In the previous two days GPS monitoring had detected unusual crustal movements which may have been indicative of a change in the movement of magma under the volcano. In the month since earthquakes began at Bárðarbunga, 25,000 earthquakes had been recorded, compared to 10,000-15,000 earthquakes recorded throughout Iceland in an average year.