Images

Images taken on September 10 and 14 show the slight rise in water level, most obvious by comparing the rock marked with an arrow in each photo. USGS photos by M. Patrick.

This video is shown at 30x speed and highlights the changing activity on the surface of the water pond. Steaming shifts in the wind, and circulation of the water is evident in areas of sharp color boundaries.

An early morning view looking north across Moku‘āweoweo, Mauna Loa's summit caldera, from a spot near the summit cabin on the volcano's south caldera rim. Frost covered much of the caldera floor that was still shadowed, and weak steaming issued from the usual areas. Overall, there were no significant changes observed at the summit.

YVO scientist showing a GPS receiver and monitoring station in Yellowstone Natio

A near-vertical view into Halema‘uma‘u, with the water pond at the bottom still in the shadow of early morning. USGS photo by D. Becker.

This video sequence begins with a close-up of the fumaroles on the north side of Halema‘uma‘u, then widens to show a broader view of the crater, with the water pond at the bottom. The video then shows a close-up of the water surface, with steaming and ripples.

View looking east, showing the narrow lava channels from Fissures 6, 13, 20 and 22. These channel carried lava south to the ocean in May 2018. USGS photo by D. Becker.

This photo shows an outcrop of pyroclastic flow deposits near Willow Creek on the Pumice Plain at Mount St. Helens. The dramatic lines crossing the outcrop indicate contacts between different layers of pyroclastic flow deposits. Two participants of the 2019 GeoGirls program are shown studying the outcrop, using it to understand the eruptive history of the volcano.

View looking east showing the large perched lava channel on the Fissure 8 flow. Puna Geothermal Venture is in the upper left. USGS photo by D. Becker.

The ponded water at the bottom of Halema‘uma‘u has continued to slowly rise. This wide view shows much of Halema‘uma‘u and the fumaroles on the upper walls of the pit.

This close-up of the eastern end of the pond provides a better view of the varying surface color. Ripples are also obvious. USGS photo by M. Patrick, 08-30-2019.

HVO conducted an overflight of the lower East Rift Zone flow field to create a thermal map, which will be posted soon on the Maps page. This wide-angle photo shows the new path of Highway 132 through the Fissure 8 lava channels.

Contrasting photos of Heart Spring on Geyser Hill in the Upper Geyser Basin from 1998 (left) and 2019 (right). Can you spot differences in the hot spring? Photos courtesy of the National Park Service.

The GeoGirls visit a volcano monitoring station on the east side of Mount St. Helens, finding out how scientists use different monitoring methods (seismic, GPS, tiltmeter) to understand more about the volcano.

The GeoGirls hike the Pumice Plain at Mount St. Helens, examining lava outcrops and volcanic sediment.

GeoGirls hike to Willow Creek, on Mount St. Helens’ Pumice Plain, to learn more about the ecology of the blast zone and how the area has recovered since the catastrophic May 18, 1980, eruption. Here, they look at stream characteristics and how it has influenced the return of life to the area.

GeoGirls 2019 group photo, with Mount St. Helens in the background.

The GeoGirls create field drawings of 1980 pyroclastic flow deposits on Mount St. Helens’ Pumice Plain.

GeoGirls venture into Ape Cave, a 2,000-year-old lava tube on the south flank of Mount St. Helens, as they learn about Mount St. Helens’ eruptive history and lava flows.

GeoGirls venture into Ape Cave, a 2,000-year-old lava tube on the south flank of Mount St. Helens, as they learn about Mount St. Helens’ eruptive history and lava flows.

Wide angle view of the southern wall of Kīlauea caldera, where there was previously a sulfer rich and highly altered area. The collapse events of 2018 created this exposeure that is approximately 100 m (300 ft) tall, whereas before 2018, the altered area was only exposed for a couple of vertical meters (yards).