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Costs and consequences of natural hazards can be enormous; each year more people and infrastructure are at risk. We develop and apply hazards science to help protect U.S. safety, security, and economic well being. These scientific observations, analyses, and research are crucial for the Nation to become more resilient to natural hazards.Read Our Science Strategy
USGS Geomagnetism Program research staff evaluate data produced by magnetic observatories, including those operated by the USGS, data processing methods, and magnetic indices derived from observatory data.
Geomagnetically-induced currents (GICs) flowing along electric power-transmission systems and other electrically-conducting infrastructure are produced by a naturally induced geo-electric field during geomagnetic disturbances.
Interpretive data release for Oregon Outer Continental Shelf Seafloor Mapping: Selected Lease Blocks Relevant to Renewable Energy
This data release includes the results of analysis of video data conducted by Oregon State University and the geo-habitat interpretation of multibeam echo sounder (MBES) data conducted by the USGS.
National Assessment of Shoreline Change: A GIS compilation of updated vector shorelines and associated shoreline change data for the north coast of Alaska, U.S. Canadian border to Icy Cape
This data release is an update to the original North Coast of Alaska data and includes revised rate-of-change calculations based on two additional shoreline positions data and improved rate metrics.
Interactive access to coastal change science and data for our Nation’s coasts. Information and products are organized within three coastal change hazard themes: 1) extreme storms, 2) shoreline change, and 3) sea-level rise. Each data item represents an individual research product, with some items grouped together as aggregates to show the breadth of the topic and make it easy to explore.
Data Release for USGS Field Activity 2014-607-FA--Oregon OCS Seafloor Mapping: Selected Lease Blocks Relevant to Renewable Energy
Data collected during 12-hour day operations in 2014, out of Charleston Harbor near Coos Bay, Oregon. The cruise plan consisted of 23 days on site split between sonar mapping and video ground truth surveying.
The Coastal Storm Modeling System (CoSMoS) makes detailed predictions of storm-induced coastal flooding, erosion, and cliff failures over large geographic scales. CoSMoS projections are currently available for the north-central coast (Half Moon Bay to Pt. Arena), San Francisco Bay, and southern California.
The seismic-landslide probability map covers the counties of Alameda, Contra Costa, Marin, Napa, San Francisco, San Mateo, Santa Clara, Santa Cruz, Solano, and Sonoma. The slope failures are triggered by a hypothetical earthquake with a moment magnitude of 7.0 occurring on April 18, 2018, at 4:18 p.m. on the Hayward Fault in the east bay part of California’s San Francisco Bay region.
Liquefaction potential as a result of HayWired earthquake scenario mainshock (April 18, 2018) shaking in Alameda and Santa Clara Counties, San Francisco Bay area, California
These data are a geospatial representation of liquefaction potential for the HayWired earthquake scenario, a magnitude 7.0 earthquake occurring on the Hayward Fault on April 18, 2018, with an epicenter in the city of Oakland, CA. These data are the product of an analysis that created a detailed liquefaction probability map covering the northern Santa Clara County and western Alameda County...
This viewer provides visualization for and accessibility to USGS lidar data obtained following Hurricane Sandy (October 2012). Access and download data and publications that include the source lidar data and the coastal dune and shoreline data needed to examine coastal change and erosion hazards.
This portal contains U.S. Geological Survey (USGS) video and photography of the seafloor off of coastal California and Massachusetts, and aerial imagery of the coastline along segments of the Gulf of Mexico and mid-Atlantic coasts. These data were collected as part of several USGS Coastal and Marine Geology Program Seafloor Mapping projects and Hurricane and Extreme Storm research.
The Hurricane Sandy Spatial Data Mapping Application showcases data and analytical products from Aerial reconnaissance imagery; Environmental Contaminants; and Reproductive success of piper plovers.
Improving near‐real‐time coseismic landslide models: Lessons learned from the 2016 Kaikōura, New Zealand, earthquake
The U.S. Geological Survey (USGS) is developing near‐real‐time global earthquake‐triggered‐landslide products to augment the USGS Prompt Assessment of Global Earthquakes for Response (PAGER) system. The 14 November 2016 Mw">MwMw 7.8 Kaikōura, New Zealand, earthquake provided a test case for evaluating the performance and near‐real‐...Allstadt, Kate E.; Jibson, Randall W.; Thompson, Eric M.; Massey, Chris; Wald, David J.; Godt, Jonathan W.; Rengers, Francis K.
Overview of the geologic effects of the November 14, 2016, Mw 7.8 Kaikoura, New Zealand, earthquake
The November 14, 2016, Kaikoura, New Zealand, earthquake (moment magnitude [Mw] 7.8) triggered more than 10,000 landslides over an area of about 12,000 square kilometers in the northeastern part of the South Island of New Zealand. In collaboration with GNS Science (the Institute of Geological and Nuclear Science Limited), we conducted ground and...Jibson, Randall W.; Allstadt, Kate E.; Rengers, Francis K.; Godt, Jonathan W.
Application of microtremor horizontal-to-vertical spectral ratio (MHVSR) analysis for site characterization: State of the art
Nakamura (Q Rep Railway Tech Res Inst 30:25–33, 1989) popularized the application of the horizontal-to-vertical spectral ratio (HVSR) analysis of microtremor (seismic noise or ambient vibration) recordings to estimate the predominant frequency and amplification factor of earthquake shaking. During the following quarter century, popularity in the...Molnar, S.; Cassidy, J. F. ; Castellaro, S.; Cornou, C.; Crow, H.; Hunter, J. A.; Matsushima, S.; Sánchez-Sesma, F. J.; Yong, Alan K.
Geologic map of the Nepenthes Planum Region, Mars
This map product contains a map sheet at 1:1,506,000 scale that shows the geology of the Nepenthes Planum region of Mars, which is located between the cratered highlands that dominate the southern hemisphere and the less-cratered sedimentary plains that dominate the northern hemisphere. The map region contains cone- and mound-shaped...Skinner, James A.; Tanaka, Kenneth L.
Geoelectric hazard assessment: the differences of geoelectric responses during magnetic storms within common physiographic zones
Geomagnetic field data obtained through the INTERMAGNET program are convolved with with magnetotelluric surface impedance from four EarthScope USArray sites to estimate the geoelectric variations throughout the duration of a magnetic storm. A duration of time from June 22, 2016, to June 25, 2016, is considered which encompasses a...Cuttler, Stephen W.; Love, Jeffrey J.; Swidinsky, Andrei
Integrate urban‐scale seismic hazard analyses with the U.S. National Seismic Hazard Model
For more than 20 yrs, damage patterns and instrumental recordings have highlighted the influence of the local 3D geologic structure on earthquake ground motions (e.g., M">M 6.7 Northridge, California, Gao et al., 1996; M">M 6.9 Kobe, Japan, Kawase, 1996; M">M 6.8 Nisqually, Washington, Frankel...Moschetti, Morgan P.; Luco, Nicolas; Frankel, Arthur; Petersen, Mark D.; Aagaard, Brad T.; Baltay, Annemarie S.; Blanpied, Michael; Boyd, Oliver S.; Briggs, Richard; Gold, Ryan D.; Graves, Robert; Hartzell, Stephen; Rezaeian, Sanaz; Stephenson, William J.; Wald, David J.; Williams, Robert A.; Withers, Kyle
THRESH—Software for tracking rainfall thresholds for landslide and debris-flow occurrence, user manual
Precipitation thresholds are used in many areas to provide early warning of precipitation-induced landslides and debris flows, and the software distribution THRESH is designed for automated tracking of precipitation, including precipitation forecasts, relative to thresholds for landslide occurrence. This software is also useful for analyzing...Baum, Rex L.; Fischer, Sarah J.; Vigil, Jacob C.
Spatial and spectral interpolation of ground-motion intensity measure observations
Following a significant earthquake, ground‐motion observations are available for a limited set of locations and intensity measures (IMs). Typically, however, it is desirable to know the ground motions for additional IMs and at locations where observations are unavailable. Various interpolation methods are available, but because IMs or their...Worden, Charles; Thompson, Eric M.; Baker, Jack W.; Bradley, Brendon A.; Luco, Nicolas; Wald, David J.
The evolution of a colluvial hollow to a fluvial channel with periodic steps following two transformational disturbances: A wildfire and a historic flood
The transition of a colluvial hollow to a fluvial channel with discrete steps was observed after two landscape-scale disturbances. The first disturbance, a high-severity wildfire, changed the catchment hydrology to favor overland flow, which incised a colluvial hollow, creating a channel in the same location. This incised channel became armored...Rengers, Francis K.; McGuire, Luke; Ebel, Brian A.; Tucker, G. E.
A flatfile of ground motion intensity measurements from induced earthquakes in Oklahoma and Kansas
We have produced a uniformly processed database of orientation-independent (RotD50, RotD100) ground motion intensity measurements containing peak horizontal ground motions (accelerations and velocities) and 5-percent-damped pseudospectral accelerations (0.1–10 s) from more than 3,800 M ≥ 3 earthquakes in Oklahoma and Kansas that occurred...Rennolet, Steven B.; Moschetti, Morgan P.; Thompson, Eric M.; Yeck, William L.
Calculation of voltages in electric power transmission lines during historic geomagnetic storms: An investigation using realistic earth impedances
Commonly, one-dimensional (1-D) Earth impedances have been used to calculate the voltages induced across electric power transmission lines during geomagnetic storms under the assumption that much of the three-dimensional structure of the Earth gets smoothed when integrating along power transmission lines. We calculate the voltage across power...Lucas, Greg M.; Love, Jeffrey J.; Kelbert, Anna
The 2013–2016 induced earthquakes in Harper and Sumner Counties, southern Kansas
We examine the first four years (2013–2016) of the ongoing seismicity in southern Kansas using high‐precision locations derived from a local seismometer network. The earthquakes occur almost exclusively in the shallow crystalline basement, below the wastewater injection horizon of the Arbuckle Group at the base of the sedimentary section. Multiple...Rubinstein, Justin L.; Ellsworth, William L.; Dougherty, Sara L.
USGS oceanographer Shawn Harrison poses in front of the USGS video camera installation atop the coastal bluff of Barter Island in northern Alaska.
Lava still oozes from the northern edge of the ‘a‘ā flow near the lighthouse at Cape Kumukahi (upper right). Smoke from burning vegetation marks location of lava oozeouts. View is toward the northeast.
Braided section of the lava channel located "downstream" between about 3.5 to 6 km (2.2 to 3.7 mi) from fissure 8 (upper right). The width of the two channels in the middle center is about 325 m (1,065 ft). View is toward the southwest.
View of the partially filled Kapoho Crater (center) and the open lava channel where it makes a 90-degree turn around the crater. The open channel no longer directly enters the ocean. Lava flows freely through the channel only to the southern edge of Kapoho Crater (left side of image). Clearly, lava moves into and through the molten core of the thick ‘a‘ā flow across a...
This animated GIF shows a sequence of radar amplitude images that were acquired by the Agenzia Spaziale Italiana CosmoSkyMed satellite system. The images illustrate changes to the...
For several years, a special ultraviolet camera has been located near Keanakākoʻi Crater at Kīlauea's summit. The camera was capable of detecting SO2 gas coming from Halema‘uma‘u crater. This morning, the camera was removed because there is very little SO2 to measure these days at the summit. In addition, cracking near Keanakākoʻi Crater was making access difficult....
USGS oceanographer Li Erikson speaks at a community outreach event on Barter Island, Alaska, to present results from earlier USGS studies and to discuss ongoing USGS research.
Pacific Coastal and Marine Science Center researchers plan to survey selected beaches and parts of the shallow seafloor in Santa Barbara and Ventura counties from March 27-30.
USGS and NASA held a joint workshop titled “From Cells to Satellites: Methane Biogeochemistry at Multiple Scales” on March 16 at NASA Ames Research Center in Mountain View, California.
USGS scientists lead investigation of tropical subterranean estuaries in the Yucatan Peninsula, Mexico!
USGS scientists lead investigation of tropical subterranean estuaries in the Yucatan Peninsula, Mexico!
New seismic hazard and risk assessments can help at-risk communities prepare for future earthquake disasters
Studying the Queen Charlotte-Fairweather fault
Measurements of the three-dimensional structure of the earth, as opposed to the one-dimensional models typically used, can help scientists more accurately determine which areas of the United States are most vulnerable to blackouts during hazardous geomagnetic storms.
The Pacific Coastal and Marine Science Center (PCMSC) in Santa Cruz, California, recently welcomed Andrew Pomeroy, a Fulbright scholar from Australia who will spend approximately 6 months here conducting research on sediment movement in coral reef systems.
After lying hidden in sediments for thousands of years, delicate frozen gas structures are in the spotlight for both scientific research and the national interest. These structures, known as gas hydrate, are being investigated by scientists the world over for their possible contributions to the global energy mix, as well as their potential interaction with the environment.
For several years, KIGAM, the Korean Institute of Geoscience and Mineral Resources, has hosted an international program for geoscience resources (IS-Geo). The IS-Geo program draws together federal and private-sector professionals from the international community to discuss a range of specific geoscience and mineral topics.
Newspaper story on earthquake hazards in Santa Rosa, California, features information from USGS scientists
USGS scientists Janet Watt and Suzanne Hecker provided information to the article’s author.
Living and working on the Pacific islands hosting a key missile tracking site soon could be almost impossible due to the impacts of climate change.