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Evan E Thoms

Evan is a Geologist for the Alaska Science Center.

Science and Products

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 Volcanic
By
Volcano Science Center

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

Since the late 1950s, the USGS has maintained a long-term glacier mass-balance program at three North American glaciers. Measurements began on South Cascade Glacier, WA in 1958, expanding to Gulkana and Wolverine glaciers, AK in 1966, and later Sperry Glacier, MT in 2005. Additional measurements have been made on Lemon Creek Glacier, AK to compliment data collected by the Juneau Icefield Research
By
Ecosystems Land Change Science Program, Alaska Science Center

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 summer of 2005.
By
Volcano Hazards Program

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 indistinguishab
Authors
Louis C. Sass, Michael G. Loso, Jason Geck, Evan Thoms, Daniel Mcgrath
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 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
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

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 Volcanic
By
Volcano Science Center

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

Since the late 1950s, the USGS has maintained a long-term glacier mass-balance program at three North American glaciers. Measurements began on South Cascade Glacier, WA in 1958, expanding to Gulkana and Wolverine glaciers, AK in 1966, and later Sperry Glacier, MT in 2005. Additional measurements have been made on Lemon Creek Glacier, AK to compliment data collected by the Juneau Icefield Research
By
Ecosystems Land Change Science Program, Alaska Science Center

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 summer of 2005.
By
Volcano Hazards Program

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 indistinguishab
Authors
Louis C. Sass, Michael G. Loso, Jason Geck, Evan Thoms, Daniel Mcgrath
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 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
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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