![]() ![]() Data sets and products from The National Map are intended for use by government, industry, and academia-focusing on geographic information system (GIS) users-as well as the public, especially in support of recreation activities. ![]() The National Map also serves as the source of base mapping information for derived cartographic products, including 1:24,000 scale US Topo maps and georeferenced digital files of scanned historic topographic maps. ![]() The majority of The National Map effort is devoted to acquiring and integrating medium-scale (nominally 1:24,000 scale) geospatial data for the eight base layers from a variety of sources and providing access to the resulting seamless coverages of geospatial data. The geographic information available from The National Map includes boundaries, elevation, geographic names, hydrography, land cover, orthoimagery, structures, and transportation. The National Map is easily accessible for display on the Web through such products as topographic maps and services and as downloadable data. Nationally consistent geospatial data from The National Map enable better policy and land management decisions and the effective enforcement of regulatory responsibilities. Customers can use geospatial data and maps to enhance their recreational experience, make life-saving decisions, support scientific missions, and for countless other activities. The National Map supports data download, digital and print versions of topographic maps, geospatial data services, and online viewing. The National Map embodies 11 primary products and services and numerous applications and ancillary services. These findings illustrate how swarm evolution is strongly controlled by 3D variations in fault architecture.The National Map is a suite of products and services that provide access to base geospatial information to describe the landscape of the United States and its territories. Our observations provide high-resolution constraints on the processes by which swarms initiate, grow, and arrest. This enables fluid migration within a shallower section of the fault with fundamentally different mechanical properties. A permeability barrier initially limits up-dip swarm migration but ultimately is circumvented. We infer that fluids are naturally injected into the fault zone from below and diffuse through strike-parallel channels while triggering earthquakes. We leverage advances in earthquake monitoring with a deep-learning algorithm to image a fault zone hosting a 4-year-long swarm in southern California. The vibrant evolutionary patterns made by earthquake swarms are incompatible with standard, effectively two-dimensional (2D) models for general fault architecture. ![]()
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