In the summer of 1996, a swarm of 4,070 earthquakes was recorded at Lōʻihi. At the time this was the most energetic earthquake swarm in Hawaii recorded history. The swarm altered of the seamount's summit; one section, "Pele's Vents", collapsed entirely upon itself and formed the renamed "Pele's Pit". The volcano has remained relatively active since the 1996 swarm and is monitored by the United States Geological Survey (USGS). The Hawaii Undersea Geological Observatory (HUGO) provided real-time data on Lōʻihi between 1997 and 1998. Lōʻihi's last known eruption was in 1996, before the earthquake swarm of that summer.