scholarly journals Analysis spectral shapes from California and central United States ground motion

1994 ◽  
Author(s):  
◽  
Keyword(s):  
United States ◽  
Ground Motion ◽  
Central United States ◽  
Spectral Shapes

Spatial attenuation of intensities for central U.S. earthquakes

1976 ◽  
Vol 66 (3) ◽  
pp. 743-751
Author(s):  
Indra N. Gupta ◽  
Otto W. Nuttli
Keyword(s):  
United States ◽  
Ground Motion ◽  
Epicentral Distance ◽  
Near Field ◽  
Mississippi Valley ◽  
Average Value ◽  
Anelastic Attenuation ◽  
Central United States ◽  
Using Data ◽  
Spatial Attenuation

abstract Attenuation of ground motion in the central United States has to be determined principally using the Modified Mercalli (MM) intensity observations because of the absence of instrumental strong ground-motion data. Nuttli's previous studies of Mississippi Valley earthquakes indicate that higher-mode surface waves produce the largest ground motion except possibly in the near-field region. Particle velocity rather than acceleration correlates directly with intensity and the coefficient of anelastic attenuation has an average value of 0.10 per degree. Using data from isoseismals of the November 9, 1968, southern Illinois and the December 16, 1811, New Madrid, Missouri earthquakes and assuming a linear relationship between log(A/T) and MM intensity, attenuation is expressed by the equation, valid for I(R) ≧IV (MM), I ( R ) = I 0 + 3.7 − 0.0011 R − 2.7 log ⁡ R ; for R ≧ 20 k m where R is the epicentral distance in kilometers. This relationship shows fairly good agreement with isoseismals of many large earthquakes in the central United States and may therefore be useful in providing realistic estimates of spatial attenuation and hence of design earthquakes for a given site. It can also be sometimes useful in estimating the epicentral intensity of an earthquake whose maximum intensity is not reliably known.

A numerical study of peak ground motion scaling

1981 ◽  
Vol 71 (6) ◽  
pp. 1963-1979
Author(s):  
Robert B. Herrmann ◽  
Michael J. Goertz
Keyword(s):  
United States ◽  
Data Base ◽  
Ground Motion ◽  
Numerical Study ◽  
Model Parameters ◽  
Data Set ◽  
States Data ◽  
Central United States ◽  
Motion Scaling ◽  
Ground Motion Scaling

Abstract Strong ground motion scaling relations for the Central United States cannot be obtained by applying regression analysis to the existing, sparse data base. Adaptation of the corresponding Western United States data base must be done carefully because the important problems of differences in regional anelastic attenuation, magnitude scales, and earthquake source physics still have to be resolved. Until this is done, empirical relations have to be adapted, but some test of their validity must be made. Since the Central United States data set is not a valid test, synthetic seismograms can be used to test some of the assumptions and results. The Central United States ground motion scaling problem differs from usual experience in that the nature of ground motion scaling at distances greater than 100 km from the source is of utmost importance. Numerical techniques are used to generate SH time histories in a four layer Central United States earth model. A study of model parameters indicates that simple deductions based on the scaling of pulses are applicable to the high-frequency surface wave trains at large distances and that spatial attenuation for these waves should be of the form R − 5 / 6 exp (−γR) . An attempt to apply the results of the numerical study to the existing Central United States data base is not too impressive because of the limited frequency range of the synthetics and lack of detailed knowledge about earth structure in the Mississippi embayment, from which the actual data were obtained.

Ground‐Motion Simulations of 1811–1812 New Madrid Earthquakes, Central United States

2015 ◽  
Vol 105 (4) ◽  
pp. 1961-1988 ◽  
Author(s):  
Leonardo Ramirez‐Guzman ◽  
Robert W. Graves ◽  
Kim B. Olsen ◽  
Oliver S. Boyd ◽  
Chris Cramer ◽  
...  
Keyword(s):  
United States ◽  
Ground Motion ◽  
Ground Motion Simulations ◽  
Central United States ◽  
New Madrid Earthquakes ◽  
New Madrid

Increases in Life-Safety Risks to Building Occupants from Induced Earthquakes in the Central United States

2019 ◽  
Vol 35 (2) ◽  
pp. 471-488 ◽  
Author(s):  
Taojun Liu ◽  
Nicolas Luco ◽  
Abbie B. Liel
Keyword(s):  
United States ◽  
Ground Motion ◽  
Oil And Gas ◽  
Fragility Curves ◽  
Hazard Model ◽  
Earthquake Ground Motion ◽  
Induced Earthquakes ◽  
Building Collapse ◽  
Central United States ◽  
One Year

Earthquake occurrence rates in some parts of the Central United States have been elevated for a number of years; this increase has been widely attributed to deep wastewater injection associated with oil and gas activities. This induced seismicity has caused damage to buildings and infrastructure and substantial public concern. In March 2016, the U.S. Geological Survey (USGS) published its first earthquake ground motion hazard model that accounts for the elevated seismicity, producing a one-year forecast encompassing both induced and natural earthquakes. To assess the potential impact of the elevated seismicity on buildings and the public, this paper quantifies forecasted risks of (1) building collapse and (2) the falling of nonstructural building components by combining the 2016 USGS hazard model with fragility curves for generic modern code-compliant buildings. The assessment shows significant increases in both types of risk compared to that caused by noninduced earthquakes alone; the magnitude of the increases varies from a few times to more than 100 times, depending on location, building period (which is correlated to building height), alternatives for the hazard model, and type of risk of interest. For exploratory purposes only, we also estimate revised values of the risk-targeted ground motion that are currently used for designing buildings.

Site-dependent spectra for earthquake-resistant design

1976 ◽  
Vol 66 (1) ◽  
pp. 221-243 ◽  
Author(s):  
H. Bolton Seed ◽  
Celso Ugas ◽  
John Lysmer
Keyword(s):  
United States ◽  
Statistical Analysis ◽  
Ground Motion ◽  
The United States ◽  
Design Criteria ◽  
Earthquake Resistant Design ◽  
Geological Conditions ◽  
Earthquake Resistant ◽  
Ground Motion Records ◽  
Spectral Shapes

abstract The paper presents the results of a statistical analysis of the spectral shapes of 104 ground-motion records obtained from 23 earthquakes, mostly in the western part of the United States. The analysis shows clear differences in spectral shapes for different soil and geological conditions, indicating the need for consideration of these effects in selecting earthquake-resistant design criteria.

A Preliminary Report on the Variability in Particle Velocity Recording of the June 10, 1987 Southeastern Illinois Earthquake

1988 ◽  
Vol 59 (3) ◽  
pp. 91-97
Author(s):  
R. Street ◽  
A. Zekulin ◽  
D. Jones ◽  
G. Min
Keyword(s):  
United States ◽  
Ground Motion ◽  
Particle Velocity ◽  
Preliminary Report ◽  
Free Field ◽  
Source Effects ◽  
Central United States ◽  
Particle Velocities

Abstract Free-field particle velocities for the June 10, 1987 southeastern Illinois earthquake, demonstrate the importante of site and source effects in the prediction of ground motion values for central United States earthquakes. The 54 particle velocity recordings of the 5.0 mbLg magnitude event, ranging in epicentral distances of 56 to 443 kilometers and azimuths of 19° to 282° about the epicenter, exhibit appreciable variability that can be attributed to both site and source effects.

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