Surficial geologic map of the Juneau urban area and vicinity, Alaska, Miscellaneous Investigations Series Map 885, presents results from a geologic investigation of surficial deposits in and near the Juneau urban area. The map area covers parts of the Juneau A-2, B-2, and B-3 quadrangles and shows the distribution of surficial geologic map units throughout the area. The map and report aimed to provide broad guidelines that would be useful for city and land-use planning. The complete report, geodatabase, and ESRI fonts and style files are available from the DGGS website: http://doi.org/10.14509/12956.

The Digital Flood Insurance Rate Map (DFIRM) Database depicts flood risk information and supporting data used to develop the risk data. The primary risk; classificatons used are the 1-percent-annual-chance flood event, the 0.2-percent-annual-chance flood event, and areas of minimal flood risk. The DFIRM Database is derived from Flood Insurance Studies (FISs), previously published Flood Insurance Rate Maps (FIRMs), flood hazard analyses performed in support of the FISs and FIRMs, and new mapping data, where available. The FISs and FIRMs are published by the Federal Emergency Management Agency (FEMA). The file is georeferenced to earth's surface using the UTM projection and coordinate system. The specifications for the horizontal control of DFIRM data files are consistent with those required for mapping at a scale of 1:12,000.

This application features ADF&G's and USFS's fish passage datasets. The Southeast Alaska Fish Passage layer is a result of a merge between these two datasets(this layer does contain duplicates and required periodic updates). Parcel data is included where available.Layer SourcesInfrastructure: Alaska Marine Highway Ferry Terminals, DCRARoads, DCRAAquatic Farming Operations, ADF&GLand Ownership: Parcels OnlineState Land All Polygon, ADNRSitka Land Ownership, static upload Juneau Parcel Viewer, static uploadPetersburg Parcel Viewer, static uploadCommunity Profiles, DCRAPlease refer to individual borough or community GIS department for most up-to-date parcel data. Anadromous Waters: AWC 2020 layers, ADF&GTongass National Forest Water Crossing Public View, USFSFish Passage Points, ADF&GWatershed Boundaries, Living atlas layerSE Habitat Permits, ADF&GAK Freshwater Fish Inventory(AFFI), ADF&GFish Inventories: HNFP Watersheds, HNFPTakashanuk Watershed Fish Passage Points, Takashanuk Watershed CouncilApplication ToolsAdd Data: Use the add data function to overlay locally saved data onto the viewer. Selection: Use the selection tool to select items in an area of interest. These items can then be downloaded and further manipulated in ArcMap desktop. Bookmarks: Quickly switch between selected locations or create your own bookmark for your area of interest. Basemap Switcher: Toggle between basemaps to get the best view of study area.

In this report, we evaluate potential tsunami hazards for the southeastern Alaska community of Juneau and numerically model the extent of inundation from tsunami waves generated by tectonic and submarine landslide sources. We calibrate our tsunami model by numerically simulating the 2011 Tohoku tsunami at Juneau and comparing our results to instrument records. Analysis of calculated and observed water level dynamics for the 2011 event in Juneau reveals that the model underestimates the observed wave heights in the city by a factor of two, likely due to complex tsunami-tide interactions. We compensate for this numerical underestimation by doubling the coseismic slip of the hypothetical tsunami sources in our models. Potential hypothetical maximum credible tsunami sources include variations of the extended 1964 rupture and megathrust earthquakes in the Prince William Sound and Alaska Peninsula regions. Local underwater landslide events in Lynn Canal, in Favorite, Saginaw, and Gastineau channels, and in Taku Inlet are also considered as possible tsunamigenic scenarios. The results show that the maximum predicted wave height in the Juneau area resulting from a tectonic tsunami is 2-3 m (6-10 ft), while a landslide-generated tsunami may cause a run-up of 15-16 m (49-52 ft) along the Fritz Cove shoreline and potentially flood portions of the airport. Results presented here are intended to provide guidance to local emergency management agencies in tsunami inundation assessment, evacuation planning, and public education to mitigate future tsunami hazards.

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Surficial geology of the Juneau urban area and vicinity, Alaska, with emphasis on earthquake and other geologic hazards, Open-File Report 72-255, presents results from a geologic study of surficial deposits in and near the Juneau urban area. The map area covers parts of the Juneau A-2, B-2, and B-3 quadrangles. The map and tables in the accompanying report show the distribution of the geologic formations, some of their physical properties, uses, and probable reactions to a severe earthquake. However, it is not the purpose of this study to predict in detail how an earthquake would affect any one place. The interpretations shown in the accompanying table should be regarded as indications of how certain geologic deposits will behave during an earthquake. Many of them are based on the behavior of similar deposits during earthquakes elsewhere, and others are based on laboratory tests of the physical properties of certain deposits. The unpredictability of magnitude, acceleration, direction, period of seismic energy, and the distance of an earthquake epicenter from Juneau makes an unqualified prediction of ground behavior impossible. The investigation is part of a 1972 earthquake hazards study in Alaska coastal communities by the U.S. Geological Survey. The complete report, geodatabase, and ESRI fonts and style files are available from the DGGS website: http://doi.org/10.14509/10955.

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This layer is a component of Bands 4 and 5.

The ENC_Approach map service displays data compiled for ENC products with a scale range of 1:50,001 and 1:150,000. The ENC data used within this application will be updated weekly. This map service is not intended for navigation purpose.

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