This portal provides information on the hazards presented to the Gulf and Atlantic coasts of the United States by hurricanes. A fact sheet summarizes some of the destructive effects and describes some of the more recent damaging storms. Other links direct site visitors to highlighted resources describing the extent and causes of coastal impacts of hurricanes, impacts on wetlands, coastal changes, ... Full description.

ShakeMaps, a product of the United States Geological Survey (USGS) Earthquake Hazards Program, are near-real-time maps of ground motion and shaking intensity that are produced following significant earthquakes. They appear as a set of links keyed to areas which have recently experienced an earthquake. The maps display instrumental intensity (modified Mercalli scale), peak ground acceleration, and ... Full description.

This set of lists and maps provides information on the latest earthquakes for the 50 states and Puerto Rico. The lists are organized by date and time, and by magnitude. On the interactive maps, symbols are coded by size (larger symbols mean greater magnitude) and by color (last hour, last day, last week). Clicking on individual map symbols links to detailed maps and written information for the selected ... Full description.

This set of lists and maps provides information on the all earthquakes occurring in the world for the past seven days. The lists are organized by date, time, and magnitude; the interactive maps are organized by region. On the maps, symbols are coded by size (larger symbols mean greater magnitude) and by color (last hour, last day, last week). Clicking on individual map symbols links to detailed maps ... Full description.

This fact sheet discusses the dangers associated with debris flows, as seen in the United States. Topics include an introduction to the properties of debris flows, a discussion of where they occur, their association with fires and volcanic activity, and some suggestions for people who live in areas prone to debris flows. Full description.

This map shows debris flow hazard areas in the United States, including locations of known debris flows and predictions of where future flows might occur. It shows the locations of debris flows in two different ways, as points representing the locations of individual flows or small groups of flows, and as areas or polygons containing one or more debris flows. Different symbols are used to indicate ... Full description.

This is the homepage of the United States Geological Survey's (USGS) Long Valley Volcano Observatory (LVO). It features a variety of information on the Mono-Inyo Craters volcanic chain in Long Valley Caldera, California. Materials include a current conditions page with status reports, updates and information releases. There is also monitoring data on seismic activity, ground deformation, gases and ... Full description.

This is the homepage of the United States Geological Survey's (USGS) Yellowstone Volcano Observatory. It features news articles, monitoring information, status reports and information releases, and information on the volcanic history of the Yellowstone Plateau Volcanic Field. Users can access monthly updates with alert levels and aviation warning codes and real-time data on ground deformation, earthquakes, ... Full description.

This interactive map shows landslide hazard areas of the United States. Users can click on selected areas of the map (marked by circles) to view more detailed enlargements. The map is color-coded; areas of high landslide incidence or susceptibility are colored pink or red. It is accompanied by an open-file report that provides an overview of the study. There are also links to shapefiles of the landslide ... Full description.

This virtual tour features three-dimensional images from the United States Geological Survey's (USGS) collection. It introduces visitors to the geology, landforms, and volcanism of Hawaii Volcanoes National Park. Features of interest include Kilauea Caldera and Halema'uma'u Crater, which have been the sites of very recent volcanic activity. There are also views of active lava flows, steam vents, and ... Full description.