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NEHRP

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Journal Article
Published: 01 August 2009
Bulletin of the Seismological Society of America (2009) 99 (4): 2365-2392.
... of κ 0 for National Earthquake Hazard Reduction Program ( NEHRP ) BC site profiles (sediment plus hard rock) in the Mississippi Embayment and the Atlantic Coastal Plain were found to increase from about 9 to 31 msec for sediment thicknesses ranging from 116 to 600 m. Stochastic simulations using...
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Journal Article
Published: 07 June 2017
Seismological Research Letters (2017) 88 (4): 943-947.
...W. Leith © Seismological Society of America This year, the National Earthquake Hazards Reduction Program (NEHRP) turns 40, four decades since the Earthquake Hazards Reduction Act of 1977 was enacted establishing the Program, spurring numerous federal, state, and community actions...
Journal Article
Published: 16 February 2016
Bulletin of the Seismological Society of America (2016) 106 (2): 673-686.
...Kenneth W. Campbell; David M. Boore Abstract We evaluate six crustal amplification models based on National Earthquake Hazards Reduction Program (NEHRP) B/C crustal profiles proposed for use in western North America (WNA) and often used in other active crustal regions where crustal properties...
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Journal Article
Published: 01 October 2011
Bulletin of the Seismological Society of America (2011) 101 (5): 2252-2269.
... (average V S in the top 30 m) values for the stations on basalt ranged from 906 to 1908 ft/s [National Earthquake Hazards Reduction Program ( NEHRP ) site classes C and D], because most sites were covered with soil of variable thickness. Based on these data, an NEHRP site-class map was developed...
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Journal Article
Published: 01 December 2010
Bulletin of the Seismological Society of America (2010) 100 (6): 3284-3294.
...Dario Albarello; Gianfranco Gargani Abstract The effective phase velocity corresponding to the wavelength of 40 m ( V e 40) is proposed here as a proxy to provide National Earthquake Hazard Reduction Program ( NEHRP ) soil classification. This represents an extension of previously proposed...
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Journal Article
Published: 01 March 2010
Seismological Research Letters (2010) 81 (2): 182.
... that these products are not luxuries but are necessary to maintain the nation's public safety. The NEHRP authorization expired 30 September 2009. The House Natural Resources Committee has jurisdiction over the authorization for the USGS component of NEHRP, and it held the 20 January 2010 hearing to address...
Journal Article
Published: 01 April 2004
Bulletin of the Seismological Society of America (2004) 94 (2): 591-597.
... of maps of National Earthquake Hazard Reduction Program (NEHRP) site classes (e.g., Wills et al. , 2000 ), and in applications of building codes to specific sites. Many measurements of near-surface shear-wave velocity, however, do not reach 30 m. For example, with one exception the shear-wave velocities...
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Journal Article
Published: 01 January 2002
Seismological Research Letters (2002) 73 (1): 39-45.
...Mehrdad Mahdyiar © 2002 by the Seismological Society of America 2002 For Y = weak motion, A = A Hartzel For Y = strong motion, A = A NEHRP The spectral values of 0.25 g and 0.1 g are used to represent 0.3 s and 1.0 s weak-motion spectral accelerations, respectively...
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Journal Article
Published: 01 April 1991
Bulletin of the Seismological Society of America (1991) 81 (2): 713.
Journal Article
Published: 01 December 2004
Bulletin of the Seismological Society of America (2004) 94 (6): 2222-2228.
...-Uniform Building Code ( nehrp-ubc ) provisions. A geologic map-based nehrp classification along nearly all of our transect line would be nehrp-d , but our measurements of Vs30 revealed that 82% of the transect is classified nehrp-c . Relatively stiff Tertiary sediments underlie the surface of the Reno...
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Journal Article
Published: 01 June 2006
Bulletin of the Seismological Society of America (2006) 96 (3): 1055-1067.
... Valley where the San Gabriel River exits the San Gabriel Mountains, at 730 m/sec, upper National Earthquake Hazards Reduction Program ( nehrp ) site class C. Much of the northeast section of the transect (in San Gabriel Valley) is also nehrp class C, or near the CD class boundary. The section...
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Image
▴ Dashed boxes: <b>NEHRP</b> soil classes. Black boxes: <b>NEHRP</b> soil classes taking ...
Published: 01 November 2009
Figure 3. ▴ Dashed boxes: NEHRP soil classes. Black boxes: NEHRP soil classes taking into account Vs 30 experimental uncertainty.
Image
Peak ground acceleration for rock (<b>NEHRP</b> B) and soil (<b>NEHRP</b> D) for interfac...
Published: 01 August 2003
Figure 9. Peak ground acceleration for rock (NEHRP B) and soil (NEHRP D) for interface events (depth = 20 km) of M 5.5, 6.5, 7.5, and 8.5 (top frame) and in-slab events (depth = 50 km) of M 5.5, 6.5, and 7.5. Nonlinear soil response is assumed for records with PGA rx > 100 cm/sec 2 .
Journal Article
Published: 01 June 2012
Bulletin of the Seismological Society of America (2012) 102 (3): 980-990.
...Jae‐won Chung; J. David Rogers Abstract Regional National Earthquake Hazards Reduction Program ( NEHRP ) soil class maps have become important input parameters for seismic site characterization and hazard studies. The broad range of shallow shear‐wave velocity ( V S 30 , the average shear‐wave...
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Journal Article
Published: 07 September 2016
Seismological Research Letters (2016) 87 (6): 1363-1372.
... a geology‐ and topography‐based map consisting of 15 V S 30 groups, (2) by site classes categorized according to National Earthquake Hazards Reduction Program ( NEHRP ) site classification, and (3) by a uniform NEHRP site class D. In case 1, ground motions are amplified using the Seyhan and Stewart (2014...
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Journal Article
Published: 01 March 2007
Seismological Research Letters (2007) 78 (2): 323-343.
...Russell A. Green; Kathryn Gunberg; Kristen Parrish; Todd Munger Abstract Performance-based earthquake engineering (PBEE) concepts dictate that the return period of the seismic design ground motions be known. While the NEHRP ( 2001 ) seismic design spectrum is constructed using two spectral...
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Journal Article
Published: 01 December 2004
Bulletin of the Seismological Society of America (2004) 94 (6B): S72-S84.
... that National Earthquake Hazards Reduction Program ( nehrp ) site classes are a useful way of grouping stations according to site amplification. In general, the sites underlain by lower shear-wave velocities have higher amplification. The amplification on nehrp class D sites exceeds a factor of 2 relative...
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Journal Article
Published: 01 June 2004
Bulletin of the Seismological Society of America (2004) 94 (3): 1109-1124.
... Reduction Program [NEHRP] class E) generates a flat response at <10 Hz, whereas thick layers of either “grey Victoria clay” (NEHRP class E) or Pleistocene till (NEHRP class C) produce peak amplitudes at 2–5 Hz. The correlation of near-surface soft soil conditions on crystalline bedrock with observed weak...
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Journal Article
Published: 01 April 1997
Bulletin of the Seismological Society of America (1997) 87 (2): 327-341.
... sites and the site factors obtained from our analysis of strong-motion data, we derive amplifications for sites with V 30 = 520 m/sec (NEHRP class C, corresponding to a mix of rock and soil sites) and V 30 = 310 and 255 m/sec (average soil and NEHRP class D sites, respectively). For the average soil...
Image
Residuals versus distance for the four <b>NEHRP</b> site categories (a) 10 Hz and ...
Published: 22 January 2019
Figure 5. Residuals versus distance for the four NEHRP site categories (a) 10 Hz and (b) 1 Hz. The horizontal line is zero residuals. The squares, circles, triangles, and pluses are NEHRP site classes A, B, C, and D, respectively. Additional residuals are in Ⓔ Figures S24 and S25.