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Updated at 7:07 p.m.] Scientists are monitoring data from ocean buoys to determine whether the earthquake already generated a tsunami, said geophysicist Gerard Fryer of the Pacific Tsunami Warning Center.
If a tsunami does erupt from the quake in shallow waters, Fryer said, it would be very small and not move much water.
Scientists said they do not expect the tsunami to affect the west coast of North America.
[Updated at 6:47 p.m.] The temblor struck 145 miles off the coast of northern Sumatra, Indonesia, at a depth of 28.6 miles, the U.S. Geological Survey reported.
A "destructive widespread tsunami" is not expected, the Pacific Tsunami Warning Center said, but a local tsunami could affect coastal areas near the quake's epicenter.
[Updated at 6:41 p.m.] A local tsunami watch has been issued for Indonesia and surrounding areas.
[Posted at 6:35 p.m.] A 7.8-magnitude earthquake struck northern Sumatra, Indonesia, early Wednesday according to the U. S. Geological Survey.
If a tsunami does erupt from the quake in shallow waters, Fryer said, it would be very small and not move much water.
Scientists said they do not expect the tsunami to affect the west coast of North America.
[Updated at 6:47 p.m.] The temblor struck 145 miles off the coast of northern Sumatra, Indonesia, at a depth of 28.6 miles, the U.S. Geological Survey reported.
A "destructive widespread tsunami" is not expected, the Pacific Tsunami Warning Center said, but a local tsunami could affect coastal areas near the quake's epicenter.
[Updated at 6:41 p.m.] A local tsunami watch has been issued for Indonesia and surrounding areas.
[Posted at 6:35 p.m.] A 7.8-magnitude earthquake struck northern Sumatra, Indonesia, early Wednesday according to the U. S. Geological Survey.
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