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Filter Total Items: 4,146
Year Published: 2011

Evidence of volcanic and glacial activity in Chryse and Acidalia Planitiae, Mars

Chryse and Acidalia Planitiae show numerous examples of enigmatic landforms previously interpreted to have been influenced by a water/ice-rich geologic history. These landforms include giant polygons bounded by kilometer-scale arcuate troughs, bright pitted mounds, and mesa-like features. To investigate the significance of the last we have...

Martinez-Alonso, Sara; Mellon, Michael T.; Banks, Maria E.; Keszthelyi, Laszlo P.; McEwen, Alfred S.
Evidence of volcanic and glacial activity in Chryse and Acidalia Planitiae, Mars; 2011; Article; Journal; Icarus; Martinez-Alonso, Sara; Mellon, Michael T.; Banks, Maria E.; Keszthelyi, Laszlo P.; McEwen, Alfred S.

Year Published: 2011

Frictional strengths of talc-serpentine and talc-quartz mixtures

Talc is a constituent of faults in a variety of settings, and it may be an effective weakening agent depending on its abundance and distribution within a fault. We conducted frictional strength experiments under hydrothermal conditions to determine the effect of talc on the strengths of synthetic gouges of lizardite and antigorite serpentinites...

Moore, Diane E.; Lockner, D.A.
Frictional strengths of talc-serpentine and talc-quartz mixtures; 2011; Article; Journal; Journal of Geophysical Research B: Solid Earth; Moore, D. E.; Lockner, D. A.

Year Published: 2011

Geodetic slip model of the 2011 M9.0 Tohoku earthquake

The three-dimensional crustal displacement field as sampled by GPS is used to determine the coseismic slip of the 2011 M9.0 Tohoku Earthquake. We employ a spherically layered Earth structure and use a combination of onland GPS, out to ∼4000 km from the rupture, and offshore GPS, which samples the high-slip region on the interplate boundary along...

Pollitz, Fred; Burgmann, Roland; Banerjee, Paramesh
Pollitz, F. F., R. Bürgmann, and P. Banerjee (2011), Geodetic slip model of the 2011 M9.0 Tohoku earthquake, Geophys. Res. Lett., 38, L00G08, doi:10.1029/2011GL048632.

Year Published: 2011

Geoinformatics in the public service: building a cyberinfrastructure across the geological surveys

Advanced information technology infrastructure is increasingly being employed in the Earth sciences to provide researchers with efficient access to massive central databases and to integrate diversely formatted information from a variety of sources. These geoinformatics initiatives enable manipulation, modeling and visualization of data in a...

Keller, G. Randy; Baru, Chaitanya; Allison, M. Lee; Gundersen, Linda C.; Richard, Stephen M.
Attribution: Natural Hazards

Year Published: 2011

Geomagnetic referencing in the arctic environment

Geomagnetic referencing is becoming an increasingly attractive alternative to north-seeking gyroscopic surveys to achieve the precise wellbore positioning essential for success in today's complex drilling programs. However, the greater magnitude of variations in the geomagnetic environment at higher latitudes makes the application of geomagnetic...

Poedjono, B.; Beck, N.; Buchanan, A. C.; Brink, J.; Longo, J.; Finn, C.A.; Worthington, E.W.
Geomagnetic referencing in the arctic environment; 2011; Conference Paper; Society of Petroleum Engineers - Arctic and Extreme Environments Conference and Exhibition 2011; Poedjono, B.; Beck, N.; Buchanan, A.; Brink, J.; Longo, J.; Finn, C. A.; Worthington, E. W.

Year Published: 2011

Ground motion attenuation during M 7.1 Darfield and M 6.2 Christchurch, New Zealand, earthquakes and performance of global Ppedictive models

The M 7.1 Darfield earthquake occurred 40 km west of Christchurch (New Zealand) on 4 September 2010. Six months after, the city was struck again with an M 6.2 event on 22 February local time (21 February UTC). These events resulted in significant damage to infrastructure in the city and its suburbs. The purpose of this study is to evaluate the...

Segou, Margaret; Kalkan, Erol
Segou, M. and Kalkan, E. “Ground Motion Attenuation during M7.1 Darfield and M6.3 Christchurch (New Zealand) Earthquakes and Performance of Global Predictive Models", Seismological Research Letters: 82 (6), 866-874, Nov-Dec, 2011

Year Published: 2011

Ground-Motion Prediction Equations (GMPEs) from a global dataset: the PEERPEER NGA equations

The PEER NGA ground-motion prediction equation s (GMPEs) were derived by five developer teams over several years, resulting in five sets of GMPEs. The teams used various subsets of a global database of ground motions and metadata from shallow earthquakes in tectonically active regions in the development of the equations. Since their publication,...

Akkar, Sinan; Gulkan, Polat; van Eck, Torild; Boore, David M.

Year Published: 2011

High-frequency filtering of strong-motion records

The influence of noise in strong-motion records is most problematic at low and high frequencies where the signal to noise ratio is commonly low compared to that in the mid-spectrum. The impact of low-frequency noise (<1 Hz) on strong-motion intensity parameters such as ground velocities, displacements and response spectral ordinates can be...

Douglas, J.; Boore, D.M.
High-frequency filtering of strong-motion records; 2011; Article; Journal; Bulletin of Earthquake Engineering; Douglas, J.; Boore, D. M.

Year Published: 2011

History of plains resurfacing in the Scandia region of Mars

We present a preliminary photogeologic map of the Scandia region of Mars with the objective of reconstructing its resurfacing history. The Scandia region includes the lower section of the regional lowland slope of Vastitas Borealis extending about 500–1800 km away from Alba Mons into the Scandia sub-basin below −4800 m elevation. Twenty mapped...

Tanaka, Kenneth L.; Fortezzo, Corey M.; Hayward, Rosalyn K.; Rodriguez, J. Alexis P.; Skinner, James A.
History of plains resurfacing in the Scandia region of Mars; 2011; Article; Journal; Planetary and space science; Tanaka, Kenneth L.; Fortezzo, Corey M.; Hayward, Rosalyn K.; Rodriguez, J. Alexis P.; Skinner, James A., Jr.

Year Published: 2011

In situ measurements of post-fire debris flows in southern California: Comparisons of the timing and magnitude of 24 debris-flow events with rainfall and soil moisture conditions

Debris flows often occur in burned steeplands of southern California, sometimes causing property damage and loss of life. In an effort to better understand the hydrologic controls on post-fire debris-flow initiation, timing and magnitude, we measured the flow stage, rainfall, channel bed pore fluid pressure and hillslope soil-moisture accompanying...

Kean, J.W.; Staley, D.M.; Cannon, S.H.
In situ measurements of post-fire debris flows in southern California: Comparisons of the timing and magnitude of 24 debris-flow events with rainfall and soil moisture conditions; 2011; Article; Journal; Journal of Geophysical Research F: Earth Surface; Kean, J. W.; Staley, D. M.; Cannon, S. H.

Year Published: 2011

Inversion of ground-motion data from a seismometer array for rotation using a modification of Jaeger's method

We develop a new way to invert 2D translational waveforms using Jaeger's (1969) formula to derive rotational ground motions about one axis and estimate the errors in them using techniques from statistical multivariate analysis. This procedure can be used to derive rotational ground motions and strains using arrayed translational data, thus...

Chi, Wu-Cheng; Lee, W.H.K.; Aston, J.A.D.; Lin, C.J.; Liu, C.-C.
Inversion of ground-motion data from a seismometer array for rotation using a modification of Jaeger's method; 2011; Article; Journal; Bulletin of the Seismological Society of America; Chi, W. -C.; Lee, W. H. K.; Aston, J. A. D.; Lin, C. J.; Liu, C. C.

Year Published: 2011

Landslide inventories: The essential part of seismic landslide hazard analyses

A detailed and accurate landslide inventory is an essential part of seismic landslide hazard analysis. An ideal inventory would cover the entire area affected by an earthquake and include all of the landslides that are possible to detect down to sizes of 1-5. m in length. The landslides must also be located accurately and mapped as polygons...

Harp, E.L.; Keefer, D.K.; Sato, H.P.; Yagi, H.
Landslide inventories: The essential part of seismic landslide hazard analyses; 2011; Article; Journal; Engineering Geology; Harp, E. L.; Keefer, D. K.; Sato, H. P.; Yagi, H.

Filter Total Items: 2,354
Image: Floodwaters in Fargo ND
March 19, 2010

Floodwaters in Fargo ND

Red River floodwaters in Fargo, ND. Photo taken from Veterans Memorial Bridge, Fargo, ND.

Attribution: Natural Hazards
Image: Floodwaters at Moorhead MN
March 19, 2010

Floodwaters at Moorhead MN

Red River floodwaters in Moorhead, MN. Photo taken at 2nd Ave and 3rd St, Moorhead, MN.

Attribution: Natural Hazards
Image: Flood wall in Fargo ND
March 19, 2010

Flood wall in Fargo ND

Flood wall on Veterans Memorial Bridge to manage floodwater from Red River at Fargo, ND.

Attribution: Natural Hazards
Image: Floodwaters at Moorhead MN
March 19, 2010

Floodwaters at Moorhead MN

Red River floodwaters in Moorhead, MN. Photo taken at 2nd Ave and 3rd St, Moorhead, MN.

Attribution: Natural Hazards
Image: Flood wall in Fargo ND
March 19, 2010

Flood wall in Fargo ND

Flood wall to manage floodwater from Red River at Fargo, ND. Photo taken from Veterans Memorial Bridge, Fargo, ND.

Attribution: Natural Hazards
Image: Floodwaters at Moorhead MN
March 19, 2010

Floodwaters at Moorhead MN

Traffic sign surrounded by Red River floodwaters in Moorhead, MN. Photo taken at 2nd Ave and 3rd St, Moorhead, MN.

Attribution: Natural Hazards
Image: Floodwaters in Fargo ND
March 19, 2010

Floodwaters in Fargo ND

Red River floodwaters in Fargo, ND. Photo taken from Veterans Memorial Bridge, Fargo, ND.

Attribution: Natural Hazards
Image: Flood Work at Fargo ND
March 19, 2010

Flood Work at Fargo ND

USGS personnel at work during 2010 flood on Red River at Fargo, ND.

Attribution: Natural Hazards
Image: Flood wall in Fargo ND
March 19, 2010

Flood wall in Fargo ND

Flood wall to manage floodwater from Red River at Fargo, ND. Photo taken from Veterans Memorial Bridge, Fargo, ND.

Attribution: Natural Hazards
Image: Flood Work at Fargo ND
March 19, 2010

Flood Work at Fargo ND

USGS personnel at work during 2010 flood on Red River at Fargo, ND.

Attribution: Natural Hazards
Image: Flood wall in Fargo ND
March 19, 2010

Flood wall in Fargo ND

Red River floodwaters overlooking flood wall on Veterans Memorial Bridge, Fargo, ND.

Attribution: Natural Hazards
Image: Flood Work at Fargo ND
March 19, 2010

Flood Work at Fargo ND

USGS personnel at work during 2010 flood on Red River at Fargo, ND.

Attribution: Natural Hazards