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Evan E Thoms (Former Employee)

Science and Products

Orthomosaic of Semisopochnoi Island, Alaska from Historical Aerial Photographs Orthomosaic of Semisopochnoi Island, Alaska from Historical Aerial Photographs

This data release provides a single 8-bit grayscale GeoTIFF orthomosaic of Semisopochnoi Island, in Aleutian Archipelago of Alaska (georeferenced in NAD 1983 UTM Zone 60N; EPSG:3373). The orthomosaic was derived from 31 black and white single frame aerial photographs taken in 1952. Also included are the non-georeferenced scans of the original aerial photographs.
By
Volcano Hazards Program

Update of the Database for Volcanic Processes and Geology of Augustine Volcano, Alaska to National Geologic Map Schema Update of the Database for Volcanic Processes and Geology of Augustine Volcano, Alaska to National Geologic Map Schema

The geologic map database in this data release is a reproduction of the U.S. Geological Survey Professional Paper 1762: Volcanic Processes and Geology of Augustine Volcano, Alaska, Waitt and Begét (2009). The database consists of a geologic map and one structural cross section that conform to the National Geologic Map Schema (GeMS). These data supersede USGS Data Series 677: Database for...
By
Volcano Science Center

Geodetic Data for USGS Glaciers: Orthophotos, Digital Elevation Models, Glacier Boundaries and Surveyed Positions Geodetic Data for USGS Glaciers: Orthophotos, Digital Elevation Models, Glacier Boundaries and Surveyed Positions

This data release provides geodetic measurements collected since the mid-1940s to characterize the surface elevation, area, and motion of glaciers studied by the U.S, Geological Survey. The primary glaciers of focus are the Benchmark Glaciers of North America which include Gulkana, Wolverine, and Lemon Creek Glaciers in Alaska, Sperry Glacier in Montana, and South Cascade Glacier in...
By
Ecosystems Land Change Science Program, Alaska Science Center

Digital geologic map data for Semisopochnoi Island, Alaska Digital geologic map data for Semisopochnoi Island, Alaska

This dataset contains digital data that were used for the creation of a geologic map shown in Figure 3 in USGS SIR 2017-5150; Postglacial Eruptive History and Geochemistry of Semisopochnoi Volcano, Western Aleutian Islands, Alaska by Coombs, M.L. and others. The map shows the generalized geology of the island and the locations of stations occupied during field work conducted in the...
By
Volcano Hazards Program
Viaduct bridge in Alaska. Buildings below bridge with water and electric tower
Anchorage port access bridge
Anchorage port access bridge
Viaduct bridge in Alaska. Buildings below bridge with water and electric tower

Anchorage port access bridge

Anchorage port access bridge

Viaduct bridge to access the port of Anchorage, Alaska. This is the only bridge instrumented with seismometers in Alaska.

By
Alaska Science Center
Viaduct bridge in Alaska. Buildings below bridge with water and electric tower

Anchorage port access bridge

Anchorage port access bridge

Viaduct bridge to access the port of Anchorage, Alaska. This is the only bridge instrumented with seismometers in Alaska.

By
Alaska Science Center
Downtown one way street with three red stoplights. 3 story blue building on with parked cars. Trees on both sides of street.
L street bend
L street bend
Downtown one way street with three red stoplights. 3 story blue building on with parked cars. Trees on both sides of street.

L street bend

L street bend

View of L street looking south in downtown Anchorage, Alaska. Shows scarp from the 1964 Great Alaska Earthquake. 

By
Alaska Science Center
Downtown one way street with three red stoplights. 3 story blue building on with parked cars. Trees on both sides of street.

L street bend

L street bend

View of L street looking south in downtown Anchorage, Alaska. Shows scarp from the 1964 Great Alaska Earthquake. 

By
Alaska Science Center

Geometry, mass balance and thinning at Eklutna Glacier, Alaska: an altitude-mass-balance feedback with implications for water resources Geometry, mass balance and thinning at Eklutna Glacier, Alaska: an altitude-mass-balance feedback with implications for water resources

We analyzed glacier surface elevations (1957, 2010 and 2015) and surface mass-balance measurements (2008–2015) on the 30 km2 Eklutna Glacier, in the Chugach Mountains of southcentral Alaska. The geodetic mass balances from 1957 to 2010 and 2010 to 2015 are −0.52 ± 0.46 and −0.74 ± 0.10 m w.e. a−1, respectively. The glaciological mass balance of −0.73 m w.e. a−1 from 2010 to 2015 is...
Authors
Louis C. Sass, Michael Loso, Jason Geck, Evan Thoms, Daniel Mcgrath
By
Alaska Science Center

1964 Great Alaska Earthquake: a photographic tour of Anchorage, Alaska 1964 Great Alaska Earthquake: a photographic tour of Anchorage, Alaska

On March 27, 1964, at 5:36 p.m., a magnitude 9.2 earthquake, the largest recorded earthquake in U.S. history, struck southcentral Alaska (fig. 1). The Great Alaska Earthquake (also known as the Good Friday Earthquake) occurred at a pivotal time in the history of earth science, and helped lead to the acceptance of plate tectonic theory (Cox, 1973; Brocher and others, 2014). All large...
Authors
Evan Thoms, Peter Haeussler, Rebecca Anderson, Robert McGimsey
By
Natural Hazards Mission Area, Earthquake Hazards Program, Earthquake Science Center

Database for volcanic processes and geology of Augustine Volcano, Alaska Database for volcanic processes and geology of Augustine Volcano, Alaska

Augustine Island (volcano) in lower Cook Inlet, Alaska, has erupted repeatedly in late-Holocene and historical times. Eruptions typically beget high-energy volcanic processes. Most notable are bouldery debris avalanches containing immense angular clasts shed from summit domes. Coarse deposits of these avalanches form much of Augustine's lower flanks. This geologic map at 1:25,000 scale...
Authors
Jacqueline McIntire, David Ramsey, Evan Thoms, Richard Waitt, James Beget
By
Natural Hazards Mission Area, Volcano Hazards Program, Volcano Science Center

Timing, distribution, and volume of proximal products of the 2006 eruption of Augustine Volcano: Chapter 8 in The 2006 eruption of Augustine Volcano, Alaska Timing, distribution, and volume of proximal products of the 2006 eruption of Augustine Volcano: Chapter 8 in The 2006 eruption of Augustine Volcano, Alaska

During and after the 2006 eruption of Augustine Volcano, we compiled a geologic map and chronology of new lava and flowage deposits using observational flights, oblique and aerial photography, infrared imaging, satellite data, and field investigations. After approximately 6 months of precursory activity, the explosive phase of the eruption commenced with two explosions on January 11...
Authors
Michelle Coombs, Katharine Bull, James Vallance, David Schneider, Evan Thoms, Rick L. Wessels, Robert McGimsey
By
Volcano Hazards Program, Volcano Science Center
The 1964 Great Alaska Earthquake Anchorage Walking Tour

The 1964 Great Alaska Earthquake Anchorage Walking Tour

On March 27, 1964 at 5:36 p.m. local time an earthquake of magnitude 9.2 occurred in the Prince William Sound region of Alaska, approximately 15.5...

Read Article

Science and Products

Orthomosaic of Semisopochnoi Island, Alaska from Historical Aerial Photographs Orthomosaic of Semisopochnoi Island, Alaska from Historical Aerial Photographs

This data release provides a single 8-bit grayscale GeoTIFF orthomosaic of Semisopochnoi Island, in Aleutian Archipelago of Alaska (georeferenced in NAD 1983 UTM Zone 60N; EPSG:3373). The orthomosaic was derived from 31 black and white single frame aerial photographs taken in 1952. Also included are the non-georeferenced scans of the original aerial photographs.
By
Volcano Hazards Program

Update of the Database for Volcanic Processes and Geology of Augustine Volcano, Alaska to National Geologic Map Schema Update of the Database for Volcanic Processes and Geology of Augustine Volcano, Alaska to National Geologic Map Schema

The geologic map database in this data release is a reproduction of the U.S. Geological Survey Professional Paper 1762: Volcanic Processes and Geology of Augustine Volcano, Alaska, Waitt and Begét (2009). The database consists of a geologic map and one structural cross section that conform to the National Geologic Map Schema (GeMS). These data supersede USGS Data Series 677: Database for...
By
Volcano Science Center

Geodetic Data for USGS Glaciers: Orthophotos, Digital Elevation Models, Glacier Boundaries and Surveyed Positions Geodetic Data for USGS Glaciers: Orthophotos, Digital Elevation Models, Glacier Boundaries and Surveyed Positions

This data release provides geodetic measurements collected since the mid-1940s to characterize the surface elevation, area, and motion of glaciers studied by the U.S, Geological Survey. The primary glaciers of focus are the Benchmark Glaciers of North America which include Gulkana, Wolverine, and Lemon Creek Glaciers in Alaska, Sperry Glacier in Montana, and South Cascade Glacier in...
By
Ecosystems Land Change Science Program, Alaska Science Center

Digital geologic map data for Semisopochnoi Island, Alaska Digital geologic map data for Semisopochnoi Island, Alaska

This dataset contains digital data that were used for the creation of a geologic map shown in Figure 3 in USGS SIR 2017-5150; Postglacial Eruptive History and Geochemistry of Semisopochnoi Volcano, Western Aleutian Islands, Alaska by Coombs, M.L. and others. The map shows the generalized geology of the island and the locations of stations occupied during field work conducted in the...
By
Volcano Hazards Program
Viaduct bridge in Alaska. Buildings below bridge with water and electric tower
Anchorage port access bridge
Anchorage port access bridge
Viaduct bridge in Alaska. Buildings below bridge with water and electric tower

Anchorage port access bridge

Anchorage port access bridge

Viaduct bridge to access the port of Anchorage, Alaska. This is the only bridge instrumented with seismometers in Alaska.

By
Alaska Science Center
Viaduct bridge in Alaska. Buildings below bridge with water and electric tower

Anchorage port access bridge

Anchorage port access bridge

Viaduct bridge to access the port of Anchorage, Alaska. This is the only bridge instrumented with seismometers in Alaska.

By
Alaska Science Center
Downtown one way street with three red stoplights. 3 story blue building on with parked cars. Trees on both sides of street.
L street bend
L street bend
Downtown one way street with three red stoplights. 3 story blue building on with parked cars. Trees on both sides of street.

L street bend

L street bend

View of L street looking south in downtown Anchorage, Alaska. Shows scarp from the 1964 Great Alaska Earthquake. 

By
Alaska Science Center
Downtown one way street with three red stoplights. 3 story blue building on with parked cars. Trees on both sides of street.

L street bend

L street bend

View of L street looking south in downtown Anchorage, Alaska. Shows scarp from the 1964 Great Alaska Earthquake. 

By
Alaska Science Center

Geometry, mass balance and thinning at Eklutna Glacier, Alaska: an altitude-mass-balance feedback with implications for water resources Geometry, mass balance and thinning at Eklutna Glacier, Alaska: an altitude-mass-balance feedback with implications for water resources

We analyzed glacier surface elevations (1957, 2010 and 2015) and surface mass-balance measurements (2008–2015) on the 30 km2 Eklutna Glacier, in the Chugach Mountains of southcentral Alaska. The geodetic mass balances from 1957 to 2010 and 2010 to 2015 are −0.52 ± 0.46 and −0.74 ± 0.10 m w.e. a−1, respectively. The glaciological mass balance of −0.73 m w.e. a−1 from 2010 to 2015 is...
Authors
Louis C. Sass, Michael Loso, Jason Geck, Evan Thoms, Daniel Mcgrath
By
Alaska Science Center

1964 Great Alaska Earthquake: a photographic tour of Anchorage, Alaska 1964 Great Alaska Earthquake: a photographic tour of Anchorage, Alaska

On March 27, 1964, at 5:36 p.m., a magnitude 9.2 earthquake, the largest recorded earthquake in U.S. history, struck southcentral Alaska (fig. 1). The Great Alaska Earthquake (also known as the Good Friday Earthquake) occurred at a pivotal time in the history of earth science, and helped lead to the acceptance of plate tectonic theory (Cox, 1973; Brocher and others, 2014). All large...
Authors
Evan Thoms, Peter Haeussler, Rebecca Anderson, Robert McGimsey
By
Natural Hazards Mission Area, Earthquake Hazards Program, Earthquake Science Center

Database for volcanic processes and geology of Augustine Volcano, Alaska Database for volcanic processes and geology of Augustine Volcano, Alaska

Augustine Island (volcano) in lower Cook Inlet, Alaska, has erupted repeatedly in late-Holocene and historical times. Eruptions typically beget high-energy volcanic processes. Most notable are bouldery debris avalanches containing immense angular clasts shed from summit domes. Coarse deposits of these avalanches form much of Augustine's lower flanks. This geologic map at 1:25,000 scale...
Authors
Jacqueline McIntire, David Ramsey, Evan Thoms, Richard Waitt, James Beget
By
Natural Hazards Mission Area, Volcano Hazards Program, Volcano Science Center

Timing, distribution, and volume of proximal products of the 2006 eruption of Augustine Volcano: Chapter 8 in The 2006 eruption of Augustine Volcano, Alaska Timing, distribution, and volume of proximal products of the 2006 eruption of Augustine Volcano: Chapter 8 in The 2006 eruption of Augustine Volcano, Alaska

During and after the 2006 eruption of Augustine Volcano, we compiled a geologic map and chronology of new lava and flowage deposits using observational flights, oblique and aerial photography, infrared imaging, satellite data, and field investigations. After approximately 6 months of precursory activity, the explosive phase of the eruption commenced with two explosions on January 11...
Authors
Michelle Coombs, Katharine Bull, James Vallance, David Schneider, Evan Thoms, Rick L. Wessels, Robert McGimsey
By
Volcano Hazards Program, Volcano Science Center
The 1964 Great Alaska Earthquake Anchorage Walking Tour

The 1964 Great Alaska Earthquake Anchorage Walking Tour

On March 27, 1964 at 5:36 p.m. local time an earthquake of magnitude 9.2 occurred in the Prince William Sound region of Alaska, approximately 15.5...

Read Article
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