Ta'u (United States) - Report for 10 August-16 August 2022 - NEW

HVO reported that earthquakes were felt by residents of the Manu?a group of islands in American Samoa beginning on 26 July.
Residents of Ofu and Olosega islands began reporting earthquakes on 10 August.
Experts from HVO, Pago Pago National Weather Service Office (NWS), National Oceanic and Atmospheric Administration (NOAA) Pacific Tsunami Warning Center, NOAA-IOC (NOAA-Intergovernmental Oceanographic Commission), International Tsunami Information Center, and USGS National Earthquake Information Center have been working together to respond to the unrest.
USGS scientists arrived on the islands and installed two microseismometers, one in Fiti?uta village on Ta?u island on 13 August and the other in Olosega village on 14 August.
The instruments began recording about 20 earthquakes per hour.
The largest earthquakes, including the felt events, were estimated to be between magnitudes 2 and 3; most of the events were too small to be felt.
The exact location and depth of these earthquakes was unknown, due to limited earthquake monitoring equipment, though the data suggested that the events were beneath the Manu?a Islands, likely closer to Ta?u island rather than Ofu-Olosega, and were probably not related to the recently active Vailulu?u seamount.
HVO noted that American Samoa?s volcanoes were monitored remotely by satellites and a distant seismic station in Apia, Samoa; the lack of ground-based monitoring stations does not allow for advanced warning of new activity.
Both the Volcano Alert Level and Aviation Color Code were categorized as Unassigned due to the lack of a volcano-monitoring network.HVO reported that earthquakes were felt by residents of the Manu?a group of islands in American Samoa beginning on 26 July.
Residents of Ofu and Olosega islands began reporting earthquakes on 10 August.
Experts from HVO, Pago Pago National Weather Service Office (NWS), National Oceanic and Atmospheric Administration (NOAA) Pacific Tsunami Warning Center, NOAA-IOC (NOAA-Intergovernmental Oceanographic Commission), International Tsunami Information Center, and USGS National Earthquake Information Center have been working together to respond to the unrest.
USGS scientists arrived on the islands and installed two microseismometers, one in Fiti?uta village on Ta?u island on 13 August and the other in Olosega village on 14 August.
The instruments began recording about 20 earthquakes per hour.
The largest earthquakes, including the felt events, were estimated to be between magnitudes 2 and 3; most of the events were too small to be felt.
The exact location and depth of these earthquakes was unknown, due to limited earthquake monitoring equipment, though the data suggested that the events were beneath the Manu?a Islands, likely closer to Ta?u island rather than Ofu-Olosega, and were probably not related to the recently active Vailulu?u seamount.
HVO noted that American Samoa?s volcanoes were monitored remotely by satellites and a distant seismic station in Apia, Samoa; the lack of ground-based monitoring stations does not allow for advanced warning of new activity.
Both the Volcano Alert Level and Aviation Color Code were categorized as Unassigned due to the lack of a volcano-monitoring network.

Source: US Geological Survey Hawaiian Volcano Observatory (HVO)

Fonte/Source: Global Volcanism Program/Smithsonian Institution


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