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Out in the open ocean, waves are constantly rolling and crashing. That motion creates a steady, rhythmic beating on the seafloor. Those vibrations travel through the Earth and are picked up by seismometers around the world, including here in Hawaii.

Ocean swells are constantly beating on the ocean floor. This nonstop drumming creates continuous signals that travel through the Earth and are recorded on seismometers. Changes in the speed of these ocean noise signals can give us clues about volcanic activity.

Long-term satellite observations show how human-built coastal structures influence the movement and buildup of sand along three Southern California beaches: Ventura, Santa Monica and Newport Beach.

Lava fountaining episode 53 at the summit of Kīlauea started on August 12 at 3:45 p.m. HST.

The U.S. Geological Survey Alaska Science Center is working in cooperation with the City and Borough of Juneau (CBJ), Alaska Department of Transportation and Public Facilities (ADOT&PF), and the Corps of Engineers (COE) to provide real-time warning of an impending glacial outburst flood and monitor Mendenhall River conditions during the flood.