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CGPS-SPGPS Comparison...
CGPS-SPGPS Comparison
CGPS-SPGPS Comparison
CGPS-SPGPS Comparison

Top panel shows a continuous GPS station located in Yellowstone National Park. The antenna is secured to the ground by several metal poles, and a nearby set of solar panels provides power to the station. Lower panel shows a semipermanent GPS station, with a small solar array for power and an antenna located close to the ground.

Top panel shows a continuous GPS station located in Yellowstone National Park. The antenna is secured to the ground by several metal poles, and a nearby set of solar panels provides power to the station. Lower panel shows a semipermanent GPS station, with a small solar array for power and an antenna located close to the ground.

Children pose with 8 ton ballistic block at Kīlauea volcano, Hawai‘...
Children pose with 8 ton ballistic block at Kīlauea, Hawai‘i.
Children pose with 8 ton ballistic block at Kīlauea, Hawai‘i.
Children pose with 8 ton ballistic block at Kīlauea, Hawai‘i.

Some of the large ballistic blocks from the Kīlauea eruption of 1924 later became visitor attractions. Many of these blocks remain in place today as evidence of the forces unleashed at Kīlauea during the eruption of 1924.

Some of the large ballistic blocks from the Kīlauea eruption of 1924 later became visitor attractions. Many of these blocks remain in place today as evidence of the forces unleashed at Kīlauea during the eruption of 1924.

Coconut grove and campground on the southern shoreline of Kīlauea V...
Coconut grove and campground on the southern shoreline of Kīlauea a...
Coconut grove and campground on the southern shoreline of Kīlauea a...
Coconut grove and campground on the southern shoreline of Kīlauea a...

Coconut grove and campground on the southern shoreline of Kīlauea Volcano at Halapē before 1975 magnitude 7.7 earthquake. Halapē was a popular hiking destination in Hawai‘i Volcanoes National Park.

Coconut grove and campground on the southern shoreline of Kīlauea Volcano at Halapē before 1975 magnitude 7.7 earthquake. Halapē was a popular hiking destination in Hawai‘i Volcanoes National Park.

Deformation monitoring equipment—GPS antenna maintenance on south s...
Deformation monitoring equipment—GPS antenna maintenance on south s...
Deformation monitoring equipment—GPS antenna maintenance on south s...
Deformation monitoring equipment—GPS antenna maintenance on south s...

Deformation monitoring equipment—GPS antenna maintenance on south side of Crater Lake National Park Boathouse on Wizard Island. Oregon

Deformation monitoring equipment—GPS antenna maintenance on south side of Crater Lake National Park Boathouse on Wizard Island. Oregon

Dome building episode from 2004-2008 at Mount St. Helens can be obs...
Dome building episode from 2004-2008 at Mount St. Helens can be obs...
Dome building episode from 2004-2008 at Mount St. Helens can be obs...
Dome building episode from 2004-2008 at Mount St. Helens can be obs...

Dome building episode from 2004-2008 at Mount St. Helens can be observed and measured with these two digital elevation models (DEMs) developed before and after the eruptive episode.

Dome building episode from 2004-2008 at Mount St. Helens can be observed and measured with these two digital elevation models (DEMs) developed before and after the eruptive episode.

Dusty Creek drainage experiences regular lahars. Gamma Ridge Format...
Dusty Creek drainage experiences regular lahars. Gamma Ridge Format...
Dusty Creek drainage experiences regular lahars. Gamma Ridge Format...
Dusty Creek drainage experiences regular lahars. Gamma Ridge Format...

Non-volcanic peaks of the North Cascades lie in the background. Dusty Creek drainage experiences regular lahars. Gamma Ridge Formation are hydrothermally altered rocks on left ridge. Loose pyroclastic fill deposits cap right ridge; Eastern view, Glacier Peak, Washington.

Non-volcanic peaks of the North Cascades lie in the background. Dusty Creek drainage experiences regular lahars. Gamma Ridge Formation are hydrothermally altered rocks on left ridge. Loose pyroclastic fill deposits cap right ridge; Eastern view, Glacier Peak, Washington.

Erratics located on a cinder cone on the northeast flank of Newberry
Erratics located on a cinder cone about 5 km (3 mi) NE of Newberry
Erratics located on a cinder cone about 5 km (3 mi) NE of Newberry
Erratics located on a cinder cone about 5 km (3 mi) NE of Newberry

Erratics located on a cinder cone on the northeast flank of Newberry Volcano, Oregon.

Exposed rock ridges are thick Pleistocene lava flows that were conf...
Exposed rock ridges are thick Pleistocene lava flows that were conf...
Exposed rock ridges are thick Pleistocene lava flows that were conf...
Exposed rock ridges are thick Pleistocene lava flows that were conf...

Exposed rock ridges are thick Pleistocene lava flows that were confined between large glaciers. Glacier Peak, Washington, view north.

Exposed rock ridges are thick Pleistocene lava flows that were confined between large glaciers. Glacier Peak, Washington, view north.

Geologists examining ash layers associated with the Dusty assemblag...
Geologists examining ash layers associated with the Dusty assemblag...
Geologists examining ash layers associated with the Dusty assemblag...
Geologists examining ash layers associated with the Dusty assemblag...

The orange layer just below geologist's hiking pole is the Mazama ash (about 7700 ybp). Below that are glacial deposits. Above the Mazama is about a meter consisting mostly of fine-grained tephras from Glacier Peak, capped by soil and plants. That the tephras sit directly on top of the Mazama indicates that "Dusty" eruptions commenced about 7,000 years ago.

The orange layer just below geologist's hiking pole is the Mazama ash (about 7700 ybp). Below that are glacial deposits. Above the Mazama is about a meter consisting mostly of fine-grained tephras from Glacier Peak, capped by soil and plants. That the tephras sit directly on top of the Mazama indicates that "Dusty" eruptions commenced about 7,000 years ago.

Geothermal ice cave at Mount Baker's summit formed by melting of a ...
Geothermal ice cave at Mount Baker's summit formed by melting of a ...
Geothermal ice cave at Mount Baker's summit formed by melting of a ...
Geothermal ice cave at Mount Baker's summit formed by melting of a ...

Geothermal ice cave at Mount Baker's summit formed by melting of a glacier due to increased heat from subsurface magma and fumarole on the surface expelling hot gasses.

Geothermal ice cave at Mount Baker's summit formed by melting of a glacier due to increased heat from subsurface magma and fumarole on the surface expelling hot gasses.

Glacier Peak volcano, Washington reflected in pond below the Whitec...
Glacier Peak volcano, WA reflected in pond below the Whitechuck Gla...
Glacier Peak volcano, WA reflected in pond below the Whitechuck Gla...
Glacier Peak volcano, WA reflected in pond below the Whitechuck Gla...

Glacier Peak volcano, Washington reflected in pond below the Whitechuck Glacier, view from the south in late summer.

Glacier Peak volcano, Washington reflected in pond below the Whitechuck Glacier, view from the south in late summer.

Guardian Geyser and Norris Geyser Basin, Yellowstone National Park....
Guardian Geyser and Norris Geyser Basin, YNP.
Guardian Geyser and Norris Geyser Basin, YNP.
Guardian Geyser and Norris Geyser Basin, YNP.

Guardian Geyser and Norris Geyser Basin, Yellowstone National Park.

Guardian Geyser and Norris Geyser Basin, Yellowstone National Park.

Horizontal displacement vectors for GPS stations at Mount St. Helen...
Horizontal displacement vectors at Mount St. Helens (2008-2014)
Horizontal displacement vectors at Mount St. Helens (2008-2014)
Horizontal displacement vectors at Mount St. Helens (2008-2014)

Map of horizontal displacement vectors for Global Positioning System (GPS) stations in and around Mount St. Helens. Blue arrows show the direction and magnitude of horizontal movement, as measured at the GPS station from 2008-2014. The total horizontal displacement is indicated in millimeters (mm) and inches (in).

Map of horizontal displacement vectors for Global Positioning System (GPS) stations in and around Mount St. Helens. Blue arrows show the direction and magnitude of horizontal movement, as measured at the GPS station from 2008-2014. The total horizontal displacement is indicated in millimeters (mm) and inches (in).

Ice-chilled lava columns at the end of a Glacier Peak lava flow, Wa...
Ice-chilled lava columns at the end of a Glacier Peak lava flow, WA.
Ice-chilled lava columns at the end of a Glacier Peak lava flow, WA.
Ice-chilled lava columns at the end of a Glacier Peak lava flow, WA.

Impressive columns like these form along the margins of ice-confined lava flows but usually are eroded off the sides due to continued glacial movement after an eruption ceases. Columns are better preserved at the ends of the flows (this photo) where they are protected somewhat from the ice.

Impressive columns like these form along the margins of ice-confined lava flows but usually are eroded off the sides due to continued glacial movement after an eruption ceases. Columns are better preserved at the ends of the flows (this photo) where they are protected somewhat from the ice.

Lahar deposit cross section in the Trout Lake lowland, which origin...
Lahar deposit cross section in the Trout Lake lowland, which origin...
Lahar deposit cross section in the Trout Lake lowland, which origin...
Lahar deposit cross section in the Trout Lake lowland, which origin...

Lahar deposit cross section in the Trout Lake lowland, which originated from Mount Adams. Thickness of deposit is about 2.5 m (8 ft).

Lahar deposit cross section in the Trout Lake lowland, which originated from Mount Adams. Thickness of deposit is about 2.5 m (8 ft).

Leveling measurements of the slope of the Mount St. Helens' crater ...
Leveling measurements of the slope of the Mount St. Helens' crater ...
Leveling measurements of the slope of the Mount St. Helens' crater ...
Leveling measurements of the slope of the Mount St. Helens' crater ...

Tiltmeters allowed 24-hour monitoring as the information was telemetered back to CVO. Other instruments such as displacement meters for measuring cracks, seismometers for measuring earthquakes, gas sensors for measuring gas concentrations, and magnetometers for measuring the magnetic field, were also used for 24-hour monitoring.

Tiltmeters allowed 24-hour monitoring as the information was telemetered back to CVO. Other instruments such as displacement meters for measuring cracks, seismometers for measuring earthquakes, gas sensors for measuring gas concentrations, and magnetometers for measuring the magnetic field, were also used for 24-hour monitoring.

Locations (Lat, Long, Depth) of January 17, 2010, earthquake swarm ...
Locations of Jan 17, 2010, earthquake swarm on Madison Plateau, YNP
Locations of Jan 17, 2010, earthquake swarm on Madison Plateau, YNP
Locations of Jan 17, 2010, earthquake swarm on Madison Plateau, YNP

Locations (Lat, Long, Depth) of January 17, 2010, earthquake swarm on Madison Plateau, Yellowstone National Park.

Locations (Lat, Long, Depth) of January 17, 2010, earthquake swarm on Madison Plateau, Yellowstone National Park.

Mammoth Hot Springs at Yellowstone National Park, Wyoming....
Mammoth Hot Springs at YNP, Wyoming.
Mammoth Hot Springs at YNP, Wyoming.
Mammoth Hot Springs at YNP, Wyoming.

Mammoth Hot Springs at Yellowstone National Park, Wyoming.

Mammoth Hot Springs at Yellowstone National Park, Wyoming.

Mount Adams viewed from the southeast in Klickitat Valley, Washingt...
Mount Adams viewed from SE in Klickitat Valley, WA.
Mount Adams viewed from SE in Klickitat Valley, WA.
Mount Adams viewed from SE in Klickitat Valley, WA.

Mount Adams viewed from the southeast in Klickitat Valley, Washington.

Mount Bachelor seen from South Sister across Sparks Lake. One of th...
Mount Bachelor seen from South Sister across Sparks Lake. One of th...
Mount Bachelor seen from South Sister across Sparks Lake. One of th...
Mount Bachelor seen from South Sister across Sparks Lake. One of th...

Mount Bachelor seen from South Sister across Sparks Lake. One of the "Devils Chain" domes visible in lower image foreground. Oregon

Mount Bachelor seen from South Sister across Sparks Lake. One of the "Devils Chain" domes visible in lower image foreground. Oregon

Mount Bachelor viewed from the south. Sparks Lake and South Sister...
Mount Bachelor viewed from the south. Sparks Lake and South Sister...
Mount Bachelor viewed from the south. Sparks Lake and South Sister...
Mount Bachelor viewed from the south. Sparks Lake and South Sister...

Mount Bachelor viewed from the south. Sparks Lake and South Sister visible in the background. Oregon.

Mount Bachelor viewed from the south. Sparks Lake and South Sister visible in the background. Oregon.