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Woods Hole Coastal and Marine Science Center Unmanned Aerial Systems (UAS) pilots Sandy Brosnahan (left) and Elizabeth Pendleton conduct a drone flight from atop a dune at Sandy Neck (Cape Cod).

Hot spring waters with relatively high dissolved element concentrations on the floor of West Thumb, Yellowstone Lake. Image acquired by the Global Foundation for Ocean Exploration ROV Yogi on August 7, 2018.

Kentucky River at Lock 2 at Lockport KY - pier at gage

Kentucky River at Lock 2 at Lockport KY - USGS staff running gage levels

Kentucky River at Lock 2 at Lockport KY - view across the dam

Kentucky River at Lock 2 at Lockport KY - view of the dam and piers

A colorful sunrise appears over the horizon of a calm ocean offshore of Jensen Beach, Florida. USGS Scientist RC Mickey collects data for location and elevation of sea turtle crawls and associated beach profiles this stretch of coastline.

The emission of volcanic gases, including sulfur dioxide and hydrogen sulfide, is not unusual at the summit of Kīlauea. However, sulfur dioxide gas emission rates are now lower than they have been since before 1983, with about 50 tonnes/day measured at the summit of the volcano on the day of this photo (October 24).

Aerial view of the fissure 8 cone and spillway captured by Civil Air Patrol during their overflight on August 7, 2018. View is toward the south.

These two plots show summit tilt (ground deformation) and seismicity (earthquake counts) on Kīlauea Volcano between July 15 and August 5, 2018. A regular pattern emerged in which seismicity gradually increased over 1-3 days (bottom), until the caldera floor suddenly dropped several meters (yards) in a matter of seconds.

This aerial view of the western part of Kīlauea Volcano's caldera was taken on August 6, 2018. The down-dropped block is faulted about 120 m (400 feet) below the caldera floor. Many 19th-century lava flows are exposed in the fault scarps. Halema‘uma‘u (not visible) is to the left of this photo.

Skinny Common Murre with keel protruding (second from the left) contrasted by normal murres. Lower Cook Inlet, Alaska.

Peggy Phillips measures a young red maple in an Adirondack watershed to see if liming has improved tree growth in a watershed where acid rain severely acidified the soil.

Woods Hole Coastal and Marine Science Center unmanned aerial systems (uas) pilots conduct drone flights at Sandy Neck Beach, Cape Cod, MA

The inferred rupture area (white dashed line) of the May 4, 2018, magnitude-6.9 earthquake, with its foreshocks and first 10 days of aftershocks, spans an area of about 800 sq km (300 sq mi). Circle size indicates earthquake magnitude; color indicates earthquake depth. Magnitudes for some of the larger events are labeled.

Fishing cone, a hot springs on the floor of Yellowstone Lake. The hot spring rim sits at lake level.

GPS station P361, on Sawtell Peak, on a nice clear day. Electrical storms destroyed multiple antennas, including the GPS antenna--here under a protective plastic dome--and three communications antennas on the tower. Data from P361, along with data from other stations in the Yellowstone region, are sent to UNAVCO for free and open distribution.

Are you ready for an eruption? Mount Baker dominates the skyline of northwestern Washington and southwestern British Columbia. Glacier Peak is mostly hidden from view. Both volcanoes have erupted in recent centuries and will erupt again, disrupting the landscape and the lives of people downstream and downwind. Learn what to do and where to get information.