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Filter Total Items: 4,552
Year Published: 2009

On baseline corrections and uncertainty in response spectrafor baseline variations commonly encountered in digital accelerograph records

Most digital accelerograph recordings are plagued by long-period drifts, best seen in the velocity and displacement time series obtained from integration of the acceleration time series. These drifts often result in velocity values that are nonzero near the end of the record. This is clearly unphysical and can lead to inaccurate estimates of peak...

Akkar, Sinan; Boore, David M.
On baseline corrections and uncertainty in response spectra for baseline variations commonly encountered in digital accelerograph records; 2009; Article; Journal; Bulletin of the Seismological Society of America; Akkar, S.; Boore, D. M.

Year Published: 2009

On the reported magnetic precursor of the 1989 Loma Prieta earthquake

Among the most frequently cited reports in the science of earthquake prediction is that by Fraser-Smith et al. (1990) and Bernardi et al. (1991). They found anomalous enhancement of magnetic-field noise levels prior to the 18 October 1989 Loma Prieta earthquake in the ultra-low-frequency range (0.0110-10.001 Hz) from a ground-based sensor at...

Thomas, J.N.; Love, J.J.; Johnston, M.J.S.
On the reported magnetic precursor of the 1989 Loma Prieta earthquake; 2009; Article; Journal; Physics of the Earth and Planetary Interiors; Thomas, J. N.; Love, J. J.; Johnston, M. J. S.

Year Published: 2009

On the reported magnetic precursor of the 1993 guam earthquake

Using 1-second magnetometer data recorded 67 km from the epicenter of the 1993 Mw 7.7 Guam earthquake, Hayakawa et al. (1996) and Miyahara et al. (1999) identify anomalous precursory changes in ultra-low frequency magnetic polarization (the ratio of vertical to horizontal field components). In a check of their results, we compare their data (GAM)...

Thomas, J.N.; Love, J.J.; Johnston, M.J.S.; Yumoto, K.
On the reported magnetic precursor of the 1993 guam earthquake; 2009; Article; Journal; Geophysical Research Letters; Thomas, J. N.; Love, J. J.; Johnston, M. J. S.; Yumoto, K.

Year Published: 2009

Overview of the magnetic properties experiments on the Mars Exploration Rovers

The Mars Exploration Rovers have accumulated airborne dust on different types of permanent magnets. Images of these magnets document the dynamics of dust capture and removal over time. The strongly magnetic subset of airborne dust appears dark brown to black in Panoramic Camera (Pancam) images, while the weakly magnetic one is bright red. Images...

Madsen, M.B.; Goetz, W.; Bertelsen, P.; Binau, C.S.; Folkmann, F.; Gunnlaugsson, H.P.; Hjollum, J.I.; Hviid, S.F.; Jensen, J.; Kinch, K.M.; Leer, K.; Madsen, D.E.; Merrison, J.; Olsen, M.; Arneson, H.M.; Bell, J.F.; Gellert, Ralf; Herkenhoff, Kenneth E.; Johnson, J. R.; Johnson, M.J.; Klingelhofer, G.; McCartney, E.; Ming, D. W.; Morris, R.V.; Proton, J.B.; Rodionov, D.; Sims, M.; Squyres, S. W.; Wdowiak, T.; Yen, A. S.

Year Published: 2009

OxCal: versatile tool for developing paleoearthquake chronologies--a primer

Ages of paleoearthquakes (events), i.e., evidence of earthquakes inferred from the geologic record, provide a critical constraint on estimation of the seismic hazard posed by an active fault. The radiocarbon calibration program OxCal (4.0.3 and above; Bronk Ramsey 2007, 2001) provides paleoseismologists with a straightforward but rigorous means of...

Lienkaemper, J.J.; Ramsey, C.B.
OxCal: versatile tool for developing paleoearthquake chronologies--a primer; 2009; Article; Journal; Seismological Research Letters; Lienkaemper, J. J.; Ramsey, C. B.

Year Published: 2009

Photometric changes on Saturn's Titan: Evidence for active cryovolcanism

We report infrared spectrophotometric variability on the surface of Saturn's moon Titan detected in images returned by the Visual and Infrared Mapping Spectrometer (VIMS) onboard the Cassini Saturn Orbiter. The changes were observed at 7°S, 138°W and occurred between October 27, 2005 and January 15, 2006. After that date the surface was unchanged...

Nelson, Robert M.; Kamp, Lucas W.; Lopes, Rosaly M.C.; Matson, Dennis L.; Kirk, Randolph L.; Hapke, Bruce W.; Wall, Stephen D.; Boryta, Mark D.; Leader, Frank E.; Smythe, William D.; Mitchell, Karl L.; Baines, Kevin H.; Jaumann, Ralf; Sotin, Christophe; Clark, Roger N.; Cruikshank, Dale P.; Drossart, Pierre; Lunine, Jonathan I.; Combes, Michel; Bellucci, Giancarlo; Bibring, Jean-Pierre; Capaccioni, Fabrizio; Cerroni, Pricilla; Coradini, Angioletta; Formisano, Vittorio; Filacchione, Gianrico; Langevin, Yves; McCord, Thomas B. ; Mennella, Vito; Nicholson, Philip D.; Sicardy, Bruno; Irwin, Patrick G.J.; Pearl, John C.

Year Published: 2009

Possible deep fault slip preceding the 2004 Parkfield earthquake, inferred from detailed observations of tectonic tremor

Earthquake predictability depends, in part, on the degree to which sudden slip is preceded by slow aseismic slip. Recently, observations of deep tremor have enabled inferences of deep slow slip even when detection by other means is not possible, but these data are limited to certain areas and mostly the last decade. The region near Parkfield,...

Shelly, David R.
Possible deep fault slip preceding the 2004 Parkfield earthquake, inferred from detailed observations of tectonic tremor; 2009; Article; Journal; Geophysical Research Letters; Shelly, D. R.

Year Published: 2009

Prediction of spectral acceleration response ordinates based on PGA attenuation

Developed herein is a new peak ground acceleration (PGA)-based predictive model for 5% damped pseudospectral acceleration (SA) ordinates of free-field horizontal component of ground motion from shallow-crustal earthquakes. The predictive model of ground motion spectral shape (i.e., normalized spectrum) is generated as a continuous function of few...

Graizer, V.; Kalkan, E.
Prediction of spectral acceleration response ordinates based on PGA attenuation; 2009; Article; Journal; Earthquake Spectra; Graizer, V.; Kalkan, E.

Year Published: 2009

Preliminary investigation of some large landslides triggered by the 2008 Wenchuan earthquake, Sichuan Province, China

The M s 8.0 Wenchuan earthquake or "Great Sichuan Earthquake" occurred at 14:28 p.m. local time on 12 May 2008 in Sichuan Province, China. Damage by earthquake-induced landslides was an important part of the total earthquake damage. This report presents preliminary observations on the Hongyan Resort slide located southwest of the main epicenter,...

Wang, F.; Cheng, Q.; Highland, L.; Miyajima, M.; Wang, Hongfang; Yan, C.
Preliminary investigation of some large landslides triggered by the 2008 Wenchuan earthquake, Sichuan Province, China; 2009; Article; Journal; Landslides; Wang, F.; Cheng, Q.; Highland, L.; Miyajima, M.; Wang, H.; Yan, C.

Year Published: 2009

Premonitory acoustic emissions and stick-slip in natural and smooth-faulted Westerly granite

A stick-slip event was induced in a cylindrical sample of Westerly granite containing a preexisting natural fault by loading at constant confining pressure of 150 MPa. Continuously recorded acoustic emission (AE) data and computer tomography (CT)-generated images of the fault plane were combined to provide a detailed examination of microscale...

Thompson, B.D.; Young, R.P.; Lockner, David A.
Premonitory acoustic emissions and stick-slip in natural and smooth-faulted Westerly granite; 2009; Article; Journal; Journal of Geophysical Research B: Solid Earth; Thompson, B. D.; Young, R. P.; Lockner, D. A.

Year Published: 2009

Preparing a population for an earthquake like Chi-Chi: The Great Southern California ShakeOut

The Great Southern California ShakeOut was a week of special events featuring the largest earthquake drill in United States history. On November 13, 2008, over 5 million southern Californians pretended that a magnitude-7.8 earthquake had occurred and practiced actions that could reduce its impact on their lives. The primary message of the ShakeOut...

Jones, Lucile M.

Year Published: 2009

Probabilistic estimation of numbers and costs of future landslides in the San Francisco Bay region

We used historical records of damaging landslides triggered by rainstorms and a newly developed Probabilistic Landslide Assessment Cost Estimation System (PLACES) to estimate the numbers and direct costs of future landslides in the 10-county San Francisco Bay region. Historical records of damaging landslides in the region are incomplete. Therefore...

Crovelli, R.A.; Coe, J.A.
Probabilistic estimation of numbers and costs of future landslides in the San Francisco Bay region; 2009; Article; Journal; Georisk; Crovelli, R. A.; Coe, J. A.

Filter Total Items: 2,697
Image: USGS Crews Measure Historic Flooding in Fargo, ND
March 27, 2009

USGS Crews Measure Historic Flooding in Fargo, ND

USGS scientist Joel Galloway measures streamflow during historical flooding in Fargo, ND. This information is critical for developing flood forecasts to help protect lives and property.

Image: USGS Crews Measure Historic Flooding in Fargo, ND
March 27, 2009

USGS Crews Measure Historic Flooding in Fargo, ND

USGS scientists measure streamflow during historical flooding in Fargo, ND. This information is critical for developing flood forecasts to help protect lives and property.

Image: Media Interview about USGS Flooding Efforts
March 27, 2009

Media Interview about USGS Flooding Efforts

USGS scientists Chris Laveau and Joel Galloway are interviewed about historic flooding in Fargo, ND.

Image: USGS Scientists Prepare to Measure Historic Flooding
March 27, 2009

USGS Scientists Prepare to Measure Historic Flooding

USGS scientist Chris Laveau breaks up ice to prepare for the boat to go in the water to conduct streamflow measurements.

Image: USGS Crews Measure Historic Flooding in Fargo, ND
March 27, 2009

USGS Crews Measure Historic Flooding in Fargo, ND

USGS scientists monitor streamflow during the historic flooding, critical information used to estimate flood dangers and helps protect lives and property.

Image: USGS Crews Measure Historic Flooding in Fargo, ND
March 27, 2009

USGS Crews Measure Historic Flooding in Fargo, ND

USGS scientists continue to monitor streamflow during the historic flooding taking place in Fargo, ND. This information provides critical information used to estimate flood dangers and helps protect lives and property.

Image: Media Interview about USGS Flooding Efforts
March 27, 2009

Media Interview about USGS Flooding Efforts

USGS scientists Chris Laveau and Joel Galloway are interviewed about historic flooding in Fargo, ND.

Image: USGS Scientists Prepare to Measure Historic Flooding
March 27, 2009

USGS Scientists Prepare to Measure Historic Flooding

USGS scientists prepare the boat before taking measurements during historical flooding in Fargo, ND.

Image: Flood waters rise in Fargo, ND
March 27, 2009

Flood waters rise in Fargo, ND

Flood waters rise during historic flooding in Fargo, ND.

Attribution: Natural Hazards
Image: USGS Crews Measure Historic Flooding in Fargo, ND
March 27, 2009

USGS Crews Measure Historic Flooding in Fargo, ND

USGS scientists continue to monitor streamflow during the historic flooding taking place in Fargo, ND. This information provides critical information used to estimate flood dangers and helps protect lives and property.

Image: USGS Crews Measure Historic Flooding in Fargo, ND
March 27, 2009

USGS Crews Measure Historic Flooding in Fargo, ND

USGS scientists monitor streamflow during the historic flooding taking place in Fargo, ND. This information provides critical information used to estimate flood dangers and helps protect lives and property.

Image: Flood waters rise in Fargo, ND
March 27, 2009

Flood waters rise in Fargo, ND

Flood waters rise during historic flooding in Fargo, ND.

Attribution: Natural Hazards