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New Interactive Web Application Features Statewide Data Related to Quaternary Active Faults and Folds


New Interactive Web Application Features Statewide Data Related to Quaternary Active Faults and Folds

The Department of Natural Resources’ Division of Geological & Geophysical Surveys (DGGS) has released an interactive web map application, Alaska’s Quaternary Faults and Folds (QFF) (Digital Data Series 3 [DDS3]). The application displays faults and folds throughout the state of Alaska that are believed capable of producing damaging earthquakes, and is part of DGGS’s Engineering Geology Section’s efforts to better characterize earthquake hazards. To use this new research and planning tool, go to Quaternary Active Faults and Folds

DDS3 includes a full range of zoom and scroll options to navigate and view the distribution of active earthquake sources across the state. Background base-map options include topographic maps, digital elevation models, and satellite images. Basic fault parameters are displayed in pop-up balloons accessed by clicking the mapped trace on-screen. Available parameters include name, age, slip rate, slip sense, dip direction, mapping accuracy, and mapped scale. The relative age of the last known activity on each structure is color coded to the explanation displayed in the right corner of the display.

Data related to the location and relative activity of earthquake sources displayed on DDS3 are from DGGS Miscellaneous Publication 141, Quaternary Faults and Folds in Alaska: A Digital Database, published in 2012. Older faults from DGGS Miscellaneous Publication 150, Digitized Faults of the Neotectonic Map of Alaska (Plafker and others, 1994), are also displayed.

As part of this release, DGGS has prepared a printable poster of the state showing the locations of faults, folds, and earthquakes. This downloadable pdf (1 sheet) accompanies MP 141 and includes summary information on earthquake hazards and historical earthquake ruptures. The combined datasets of DDS 3, MP 141, and MP 150 together represent a readily accessible, user-friendly resource valuable to a wide variety of users including policy planners, engineers, researchers, and educators.

Agencies, institutions, and companies are encouraged to submit additional data on active earthquake sources to be included, pending review, in future updates of the fault and fold database. If you would like to contribute information to the database, or for information about DDS3, MP141, or MP150, please contact the Alaska Division of Geological & Geophysical Surveys, (907) 451-5020, or visit the division’s office at 3354 College Road, Fairbanks, Alaska 99709.

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