Surface rupture map of the 2002 M7.9 Denali fault earthquake, Alaska: Digital data
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Abstract
The November 3, 2002, Mw7.9 Denali Fault earthquake produced about 340 km of surface rupture along the Susitna Glacier Thrust Fault and the right-lateral, strike-slip Denali and Totschunda Faults. Digital photogrammetric methods were primarily used to create a 1:500-scale, three-dimensional surface rupture map, and 1:6,000-scale aerial photographs were used for three-dimensional digitization in ESRI's ArcMap GIS software, using Leica's StereoAnalyst plug in. Points were digitized 4.3 m apart, on average, for the entire surface rupture. Earthquake-induced landslides, sackungen, and unruptured Holocene fault scarps on the eastern Denali Fault were also digitized where they lay within the limits of air photo coverage. This digital three-dimensional fault-trace map is superior to traditional maps in terms of relative and absolute accuracy, completeness, and detail and is used as a basis for three-dimensional visualization. Field work complements the air photo observations in locations of dense vegetation, on bedrock, or in areas where the surface trace is weakly developed. Seventeen km of the fault trace, which broke through glacier ice, were not digitized in detail due to time constraints, and air photos missed another 10 km of fault rupture through the upper Black Rapids Glacier, so that was not mapped in detail either.
Study Area
| Publication type | Report |
|---|---|
| Publication Subtype | USGS Numbered Series |
| Title | Surface rupture map of the 2002 M7.9 Denali fault earthquake, Alaska: Digital data |
| Series title | Data Series |
| Series number | 422 |
| DOI | 10.3133/ds422 |
| Edition | Version 1.0 |
| Year Published | 2009 |
| Language | English |
| Publisher | U.S. Geological Survey |
| Contributing office(s) | Alaska Science Center |
| Description | Report: iv, 9 p.; 1 Plate: 36.00 × 19.00 inches; Google Earth Files; GIS Files |
| Time Range Start | 2002-11-03 |
| Time Range End | 2002-11-03 |
| Country | United States |
| State | Alaska |
| Other Geospatial | Denali fault |
| Scale | 325000 |
| Online Only (Y/N) | Y |
| Additional Online Files (Y/N) | Y |
| Google Analytic Metrics | Metrics page |