#Hawaiʻi earthquake
No tsunami threat after 4.0 earthquake off Kaʻū Coast of the Big Island
There is no tsunami expected after a preliminary magnitude 4.0 earthquake reported at 9:38 a.m. on Tuesday, May 20, 2025 off the Kaʻū Coast of the Big Island. The Pacific Tsunami Warning Center issued an information statement saying there is no tsunami expected, however some areas may have experienced shaking.
Volcano Watch — What’s shaking? Earthquake alerts explained
When an earthquake strikes in Hawaiʻi, there are three agencies that analyze the earthquake for its location and magnitude. Typically, the earliest earthquake information will be from automated solutions generated by computer algorithms from PTWC and HVO. Human analysts from HVO and NEIC will then review the magnitude-2.5 or larger earthquakes to get a more accurate magnitude and location.
More than 70 earthquakes in seismic swarm around Kamaʻehuakanaloa, formerly Lōʻihi Seamount
The HVO issued as status update saying there have been over 70 earthquakes so far in this swarm, with 32 events greater than magnitude 2 and two events greater than magnitude 4. The largest earthquake has been a magnitude-4.3 event that occurred Saturday at 12:05 p.m. HST, at a depth of 5.8 km (3.6 mi) below sea level and 4.8 km (3.0 mi) below the volcano’s summit.
