Due to a lapse in appropriations, the majority of USGS websites may not be up to date and may not reflect current conditions. Websites displaying real-time data, such as Earthquake and Water and information needed for public health and safety will be updated with limited support. Additionally, USGS will not be able to respond to inquiries until appropriations are enacted. For more information, please see www.doi.gov/shutdown
Between the years 1973–2008, there was an average of 25 earthquakes of magnitude three and larger in the central and eastern United States. This rate ballooned to over 600 M3+ earthquakes in 2014 and over 1000 in 2015. Since 2015 the earthquake rate has declined significantly (364 M3+ earthquakes in 2017), but this is still much higher than the natural earthquake rate.
The USGS is currently studying seismicity that may be induced at 6 locations across the United States. These studies involve earthquake monitoring, examining industrial data, and evaluating any relationships between seismicity and industrial actions.
The USGS is currently developing new methods to evaluate the hazard due to induced earthquakes. These methods will account for the rapid changes in earthquake rate that we have witnessed in the past few years.
The USGS uses numerical simulations of earth processes to: Evaluate the physical relationships between fluid injection and earthquakes at specific sites, and to simulate possible future behaviors of new and ongoing injection projects.
Preliminary simulation of the tsunami from the October 25, 2010 M=7.7 subduction zone earthquake offshore of the Mentawai Islands, Indonesia
San Carlos Apache Reservation covers 1.8 million acres in east-central Arizona, and has diverse ecosystems and vegetation types that support a natural resource-based economy.
Hurricane Sandy Response- Linking the Delmarva Peninsula's Geologic Framework to Coastal Vulnerability
The Delmarva Peninsula is a 220-kilometer-long headland, spit, and barrier island complex that was significantly affected by Hurricane Sandy. In order to better constrain controls on coastal vulnerability and evolution, the region’s sediment sources, transport pathways and sediment sinks must be identified. This project defines the geologic framework of the Delmarva coastal system through...
The instruments were installed in the spring of 2009 and are used to monitor and detect changes in local conditions. Soil water content and ground water pressure are monitored at two nests on the same hillslope. Data for the site include:
- Rainfall ...
Four video cameras overlook the coast at Isla Verde in San Juan, Puerto Rico. Two of them focus on the shoreline: Camera 1 looks at the nearby beach and eastward along the shore, and Camera 2 looks farther away to the eastern end of the beach. The other two look out across the reefs: Camera 3 to the north-northwest, and Camera 4 to the northeast.