United States Department of Transportation
i
The Long-Term Effect of Earthquakes: Using Geospatial Solutions to Evaluate Heightened Rockfall Activity on Critical Lifelines [supporting dataset]
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2023-02-24
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[JSON-3.57 KB]
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Alternative Title:Rockfall Activity Rate System Analysis for Scenario Earthquakes in Alaska
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Abstract:Rockfall is a chronic slope hazard along transportation corridors throughout the Pacific Northwest (PNW), resulting in frequent road closures and lane restrictions, and directly impacting driver safety, mobility, and accessibility for many critical lifelines. These impacts are amplified by moderate- to large-magnitude seismic events – both during and after shaking, making earthquakes a driver of persistent rockfall hazards. For this project, we performed continued monitoring of rockfall activity on a series of rock slopes via repeat terrestrial laser scanning, geologic characterization, and imagery collection. These data, as well as custom-generated shakemaps and a database creation (Alaska GAM, ODOT unstable slopes database) of rockfall events throughout the PNW and New Zealand, enable extrapolation of potential coseismic and post-seismic hazards to a variety of earthquake scenarios in Alaska. We extend and modify the Rockfall Activity Rate System (RoARS) model to rock slope sites in two Alaskan transportation corridors to evaluate coseismic and post-seismic rockfall hazard at a regional scale, as well as estimate rockfall volumes and associated closure times. We find that both corridors are prone to earthquake-induced rockfall activity, but the magnitude and long-term persistence of this activity is highly dependent on the given rupture event, as are closure times along each corridor. While scenario-dependent, this database and model creation explores a new avenue for decision-makers to evaluate potential rockfall scenarios considering seismic disturbance, and consequently, plan accordingly for closures and restoration of mobility following shaking.
The total size of the zip file is 3.6 MB. The following file types are standard for GIS mapping software: GDBINDEXES, GDTABLE, GDTABLX, ATX, FREELIST, HORIZON, SPX, and GDB. Because the files pertain to map layers and images, they are best viewed using the software that the team used or with any open source 2D and 3D mapping software such as QGIS.
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Content Notes:National Transportation Library (NTL) Curation Note: As this dataset is preserved in a repository outside U.S. DOT control, as allowed by the U.S. DOT’s Public Access Plan (https://doi.org/10.21949/1503647) Section 7.4.2 Data, the NTL staff has performed NO additional curation actions on this dataset. The current level of dataset documentation is the responsibility of the dataset creator. NTL staff last accessed this dataset at its repository URL on 2023-11-30. If, in the future, you have trouble accessing this dataset at the host repository, please email NTLDataCurator@dot.gov describing your problem. NTL staff will do its best to assist you at that time.
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