A major, 7.6-magnitude earthquake struck in the Caribbean Sea on Saturday and triggered a tsunami advisory in Puerto Rico and ...
Seismic testing involves blasting the seafloor with high-powered airguns (a kind of powerful horn) every 10 seconds and measuring the echoes with long tubes to map offshore oil and ... Expanding ...
according to the USGS report map. Light to weak seismic activity was reported in coastal New England and weak seismic activity was felt further inland.
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