Earthquake ground motions in extensional tectonic regimes

Spudich, Paul; Fletcher, J. B.; Hellweg, M.; Boatwright, J.; Sullivan, C.; Joyner, William B.; Hanks, Thomas C.; McGarrr, A.F.; Baker, L. R. I.; Lindh, A. G.

doi:10.3133/ofr96292

“…The scenario earthquake models produce larger ground motions than the western United States empirical models would predict, which are larger still than the values derived from the Spudich et al (1996) model. The differences of the three estimates are largest at high frequencies.…”

Section: -159 Progress Report #15mentioning

confidence: 67%

Site characterization progress report, Yucca Mountain, Nevada: Number 19, April 1, 1998--September 30, 1998

Author¹

1999

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DISTRIBUTION OF THIS DOCUMENT I S URPklMtm Washington, DC 20585 A p r i l 2 3 , 1997 NOTE TO READERS:During this reporting period, we released our revised Program Plan which outlines a focused, integrated program that will achieve key Program and statutory objectives. The plan identifies three near-term objectives: (1) updating in 1997 the regulatory framework for repository site characterization, (2) supporting a 1998 viability assessment, and (3) if the site is suitable, submitting a Secretarial site recommendation to the President in 2001 and a license application to the Nuclear Regulatory Commission in 2002. In support of the first near-term objective, we drafted a Notice of Proposed Rulemaking to amend the repository siting process. This notice was subsequently published in the Federal Register on December 16, 1996, which began a 60-day public comment period. Subsequent notices extended the comment period to May 16, 1997.Tunneling was completed in the Exploratory Studies Facility main drift, and the tunnel boring machine continued tunneling up the south ramp. In December 1996, we encountered worse ground conditions than expected, but even with these poor ground conditions, the tunnel boring machine reached the south portal on April 25,1997. The completion of the main drift marks a shift in emphasis from constructing the Exploratory Studies Facility to conducting scientific experiments in the tunnel and alcoves.The initial construction phase of the Thermal Testing Facility was completed and the first phase of the in situ heater tests began on schedule in August 1996. This eighteen month test will measure thermal effects on the rock and the moisture within the rock.Most of our site investigations and design and performance assessment activities this period were directed toward providing information for the 1998 viability assessment, our second near-term objective. Several studies and modeling activities were completed that provided new information on the potential percolation flux in the repository horizon. The new information indicated the potential for preferential water pathways and for a percolation flux higher than previously indicated.During the next period, we will continue modeling, testing, and data collection activities to reduce the uncertainty in the range of percolation flux that can be expected i? the repository horizon. In the Note to Readers for the 14th Progress Report, we indicated that we expected to issue the revised Waste Containment and Isolation Strategy during the first half of 1997. We will re-evaluate issuance of the strategy as a consequence of any changes to the predicted range c,f percolation flux rates. In addition, we will reassess the results from our on-going repository design and performance activities discussed in this progress report in light of the these same changes. 4-15Design Activity 1.1 1.3. PROGRESS REPORT #15 EXECUTIVE SUMMARYDuring the second half of fiscal year 1996, activities at the Yucca Mountain Site Characterization Proj...

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“…At greater source-to-site distances (regional earthquakes), the model provides ground motions that are about 30 to 40 percent lower than the average of the western United States models, and the standard deviation is much larger than the average of the western United States attenuation relations. The Spudich et al (1996) model does not distinguish between strike-slip and normal faulting events in extensional regimes, and the residuals show a magnitude dependence that may correlate with the style of faulting.…”

Section: Nuclear Explosionsmentioning

confidence: 91%

“…Ideally, empirical attenuation relations for Yucca Mountain should be developed from ground motion recordings of Basin and Range earthquakes; unfortunately, there are not sufficient data to constrain such a model, and global data sets are required. The study, conducted by Spudich et al (1996), indicates that most of the empirical models developed from recordings of primarily strike-slip and reverse faulting earthquakes in western United States predict relatively higher ground motion levels than are seen from the extensional regime data. The Spudich et al (1996) empirical model predicts lower ground motions than the western United States models at all periods except for long periods for M > 5 events.…”

Section: Nuclear Explosionsmentioning

confidence: 99%

“…The study, conducted by Spudich et al (1996), indicates that most of the empirical models developed from recordings of primarily strike-slip and reverse faulting earthquakes in western United States predict relatively higher ground motion levels than are seen from the extensional regime data. The Spudich et al (1996) empirical model predicts lower ground motions than the western United States models at all periods except for long periods for M > 5 events. At greater source-to-site distances (regional earthquakes), the model provides ground motions that are about 30 to 40 percent lower than the average of the western United States models, and the standard deviation is much larger than the average of the western United States attenuation relations.…”

Section: Nuclear Explosionsmentioning

confidence: 99%

“…The differences of the three estimates are largest at high frequencies. The Spudich et al (1996) relation, however, does not explicitly include the effects of the low kappa (spectral decay parameter for near-surface attenuation) observed at the Yucca Mountain site, probably a result of the highly fractured tuffs that makeup the shallow crust. The average kappa of the two Yucca Mountain tuff sites (0.018 second) is lower than that of typical California softrock (0.04); therefore, at low levels of shaking the tuffs have less damping than for California soft-rock conditions.…”

Section: -159 Progress Report #15mentioning

confidence: 99%

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Site characterization progress report: Yucca Mountain, Nevada. Number 15, April 1--September 30, 1996

1997

0

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DISTRIBUTION OF THIS DOCUMENT I S URPklMtm Washington, DC 20585 A p r i l 2 3 , 1997 NOTE TO READERS:During this reporting period, we released our revised Program Plan which outlines a focused, integrated program that will achieve key Program and statutory objectives. The plan identifies three near-term objectives: (1) updating in 1997 the regulatory framework for repository site characterization, (2) supporting a 1998 viability assessment, and (3) if the site is suitable, submitting a Secretarial site recommendation to the President in 2001 and a license application to the Nuclear Regulatory Commission in 2002. In support of the first near-term objective, we drafted a Notice of Proposed Rulemaking to amend the repository siting process. This notice was subsequently published in the Federal Register on December 16, 1996, which began a 60-day public comment period. Subsequent notices extended the comment period to May 16, 1997.Tunneling was completed in the Exploratory Studies Facility main drift, and the tunnel boring machine continued tunneling up the south ramp. In December 1996, we encountered worse ground conditions than expected, but even with these poor ground conditions, the tunnel boring machine reached the south portal on April 25,1997. The completion of the main drift marks a shift in emphasis from constructing the Exploratory Studies Facility to conducting scientific experiments in the tunnel and alcoves.The initial construction phase of the Thermal Testing Facility was completed and the first phase of the in situ heater tests began on schedule in August 1996. This eighteen month test will measure thermal effects on the rock and the moisture within the rock.Most of our site investigations and design and performance assessment activities this period were directed toward providing information for the 1998 viability assessment, our second near-term objective. Several studies and modeling activities were completed that provided new information on the potential percolation flux in the repository horizon. The new information indicated the potential for preferential water pathways and for a percolation flux higher than previously indicated.During the next period, we will continue modeling, testing, and data collection activities to reduce the uncertainty in the range of percolation flux that can be expected i? the repository horizon. In the Note to Readers for the 14th Progress Report, we indicated that we expected to issue the revised Waste Containment and Isolation Strategy during the first half of 1997. We will re-evaluate issuance of the strategy as a consequence of any changes to the predicted range c,f percolation flux rates. In addition, we will reassess the results from our on-going repository design and performance activities discussed in this progress report in light of the these same changes. 4-15Design Activity 1.1 1.3. PROGRESS REPORT #15 EXECUTIVE SUMMARYDuring the second half of fiscal year 1996, activities at the Yucca Mountain Site Characterization Proj...

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The dependence of response spectrum on the tectonic ambient shear stress field

Li

¹

,

Chen

²

,

Bai

³

2005

Acta Seimol. Sin.

1

0

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It has been analyzed the influence of the tectonic ambient shear stress value on response spectrum based on the previous theory. Based on the prediction equation BJF94 presented by the famous American researchers, CLB20, a new prediction formula is proposed by us, where it is introduced the influence of tectonic ambient shear stress value on response spectrum. BJF94 is the prediction equation, which mainly depends on strong ground motion data from western USA, while the prediction equation SEA99 is based on the strong ground motion data from extensional region all over the world. Comparing these two prediction equations in detail, it is found that after BJF94's prediction value lg(Y) minus 0.16 logarithmic units, the value is very close to SEA99's one. This case demonstrates that lg(Y) in extensional region is smaller; the differences of prediction equation are mainly owe to the differences of tectonic ambient shear stress value. If the factor of tectonic ambient shear stress value is included into the prediction equation, and the magnitude is used seismic moment magnitude to express, which is universal used around the world, and the distance is used the distance of fault project, which commonly used by many people, then regional differences of prediction equation will become much less, even vanish, and it can be constructed the universal prediction equation proper to all over the world. The error in the earthquake-resistant design in China will be small if we directly use the results of response spectrum of USA (e.g. BJF94 or SEA99).Key words: acceleration response spectrum; tectonic ambient shear stress field; prediction equation of response spectrum; seismic moment magnitude; distance of fault project CLC number: P315.72+7 Document code: A

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Earthquake ground motions in extensional tectonic regimes

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Site characterization progress report, Yucca Mountain, Nevada: Number 19, April 1, 1998--September 30, 1998

Site characterization progress report, Yucca Mountain, Nevada: Number 19, April 1, 1998--September 30, 1998

Site characterization progress report: Yucca Mountain, Nevada. Number 15, April 1--September 30, 1996

The dependence of response spectrum on the tectonic ambient shear stress field

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