Update on earthquakes and underwater volcano activities in Manu’a


There were “no significant changes over the past 24 hours” of the underwater volcano and earthquakes around Manu’a. This was confirmed in the latest statement issued by the US Geological Survey yesterday.

“Earthquake swarm in the Manuʻa islands of American Samoa continues, with a source most likely closer to Ta’ū island than Vailuluʻu seamount. Five earthquakes were reported over the past 24 hours.

“A microseismometer (earthquake-detecting device) installed in Fitiʻuta village on Taʻū island yesterday is recording approximately 30-60 earthquakes per hour; most events are too small to be felt. “Estimated magnitudes of the largest earthquakes, including the felt events, are between magnitude 2 and 3.”

The report says there were no significant changes overnight and conditions remain the same as reported on Saturday, August 13, 2022.

“Residents of the Manuʻa group of islands in American Samoa continue to feel earthquakes, with five felt earthquakes reported over the past 24 hours.

“This earliest report of this activity is from July 26th, the largest events recorded over the past 24 hours correlate with five felt reports and appear to be between magnitude 2 and 3.

“Approximately 30-60 earthquakes are occurring per hour, but most are too small to be felt. “Reports suggest that the earthquakes vary in intensity, but are generally short, sharp jolts.

“The earthquakes are more likely to be felt by people indoors at rest and along the coast, where buildings sit on sediment that amplifies shaking. These factors are probably responsible for the variability in reporting.

“Based on the analysis of earthquake data from a microseismometer installed yesterday on Taʻū island and felt reports, the source of these earthquakes is likely closer to Taʻū island rather than to Vailuluʻu. “Scientists plan to install additional instruments to monitor earthquakes and other activity in the coming week.”