Over 500 earthquakes were located by the USGS Hawaiian Volcano Observatory (HVO) between noon Friday and noon Saturday, May 4-5, 2018. A magnitude-6.9 earthquake at 12:32 p.m. HST on Friday was preceded by two foreshocks with magnitudes of 5.4 and 4.4 at 11:32 a.m. and 11:38 a.m., respectively, and followed by eight aftershocks with magnitudes greater than 4.0, including a magnitude-5.3 at 2:37 p.m. Moderate to strong aftershocks should be expected for weeks to months to come. The earthquakes are related to the ongoing intrusion into Kīlauea’s East Rift Zone and reflect adjustments beneath the south flank of the volcano. USGS map.