ML20129F107
| ML20129F107 | |
| Person / Time | |
|---|---|
| Site: | 05000447 |
| Issue date: | 12/31/1983 |
| From: | GENERAL ELECTRIC CO. |
| To: | |
| Shared Package | |
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| References | |
| FOIA-84-175, FOIA-84-A-66 NUDOCS 8506060683 | |
| Download: ML20129F107 (30) | |
Text
OEDIERAL ELECTRIC COMPANY PROPRIETARY INFORMATION GESSAR II SESIMIC EYENT UNCERTAINTY ANALYSIS GENERAL ELECTRIC COMPANY DECEMBER 1983 85060606B3 841203 f C,T7,]COM_m
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GENERAL ELECTRIC COMPANY PROPRIETARY INFORMATION
- x CONTENTS PAGE
1.0 INTRODUCTION
1 2.0 DISCUSSION OF UNCERTAINTIES i
e 30 MTHODOLOGY 11 4.0 RESULTS AD 50 REFERENCES I
9
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.g GENERAL ELECTRIC COMPANY PROPRIETARY INFORMATION 1.0 IETRODUCTIDM In September 1983, a probabilistic seismic event analysis of the BWR/6 Mark III Standard Plant design (OESSAR II Seismic Event Analysis)I was provided to the NRC to aid in the NRC Staff evaluation of the design. The consequences, in terus of annual core damage frequency and total latent fatality risk, were evaluated for potential seismic events with magnitudes up to an effective peak ground acceleration of 0 95g. The analysis indicated that seismic events would contribute an additional 9 percent to the annual oore damage frequency calculated for internal plant events. Total risk was shown to increase by about 55 due to seismic events.
This report documents the uncertainty analysis performed to determine the effect on core damage frequency of uncertainties in the data characterizing earthquake annual recurrence frequency (hazard curve) and the component and structure failure probabilities (fragility curves).
The uncertainity characterisitics and their mathematical representation for use in the Analysis, are discussed in Section 2.0.
The methodology for evaluating the effects of the uncertainties on core damage frequency estimates is presented in Section 3 0.
The analysis results are presented and discussed in Section 4.
2.0 DISCUSSION OF UNCERTAINTIES The two major sources of uncertainty in the input data have been incorporated into the seismic risk analysis code. These uncertainties are: 1) uncertainity in the seismic hazard ourve: and 2) uncertainity in the fragility curves.
GENERAL ELECTRIC COMPANY PROPRIETARY INFORMATION Mazard Curve Uncertainty The hasard ourve defines the annual frequency of exceedance of effective peak ground acceleration. The curve provides a reasonable upper bound expected value for potential GESSAR II sites in the United States. The best estimate ourve is shown in Figure 2-1.
The uncertainty in the best estisate curve is based on the results of a study k
by D. Oprentf "A survey of Expert Opinion on Low Probability Earthquakes *.
The study polled seven experts, to obtain their best estimate of seismic Cxceedance frequency versus peak horizontal acceleration, for eleven LWR plants. The seven experts participating in the study are listed in Table 2-1.
The plant sites considered are shown in Table 2-2.
For a single plant site, the estimates given by the seven experts we e processed to obtain a sample mean and standard deviation for each acceleration level of interest. The corresponding coefficients of variation were also s.
omiculated.[
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,e GENERAL ELECTRIC COMPANY PROPRIETARY INFORMATION Framility Curve Uncertainties RNLSecl m Seianic fragility ourves are developed pummmmaey mum analysis ocabined heavily with engineering judgement supported by limited test data. Such fragility curves will contain a great deal of uncertainty, and it is imperative that this uncertainty be included in the subsequent risk analysis.
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Table 2-1 PARTICIPANTS IE SURTIY I.
(in alphabetical, not aunerical, order)
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i Professer Bruce A. Belt Department of Geology and Geophysics University of California, Berkaley Professor David M. Boers Department of Geophysics Stanford University Professor Nathan M. Neumark Departamat of Civil Engineering University of 1111 asis at Urbana Professor Basjamin M. Page Departasat of Geology i
Stanford University l
Professor Stewart W. Smith Graduate Progran in Geophysics University of Washington, Seattle Professor George Thoepesa l
6 Departamat of Geology Stanford University Professor Janne T. Wilson Institute of Science and Technology Daiversity of Michigan, Ana Arbor
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r Table 2-2 LIST OF SITES h
Site Name (State) g 1-Brunswick Otorth Carolina) 2 Cooper Diebraska) 3 Devia assee (Ohio) 5, Diablo Canyon (California) 5 Crand Gulf Otississippi) 6' Pilgrim Otassachusetts) f i
Bancho Seco (California) 8 River Band Omuisiana)
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9 Summer (South Carolina) 10 semit (Delaware)
U Trojan (Oregon) -
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GENERAL ELECTRIC COMPANY PROPRIETART INFORMATION 4.0 Besults Section 3 0 discussed the method used to obtain a set of random estimates of the core damage frequency whose variation is determined by the uncertainty of the analysis input functions (hazard curve and fragility curves). One Forh thousand random outputs were calculated and the outputs were processed to obtain stat'istical measure of the output uncertainty. The mean, 5th, 50th and 95th peroentile values and the standard deviation were calculated. The mean and m cakulated 1o bc 6.t4 stD ** c.md 12 x 3Cf $ respectMk.
M ian value of core damage frequency M w
A standard deviation 5.9 4
estimate of M g/c was obtain. The uncertainty range for the core damage I
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frequency defined by the 5th and 95th peroentile estimates is /,2yd to 2.0 W 4' The probability density function and the cumulative probability function for annual core damage frequency is shown in Figures 4-1 and 4-2.
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GENERAL ELECTRIC COMPANY FROPRIETARY INFORMATION 50 REFERENCES 1.
Choi, J. C.
E., et al., *0RSSAR II seismic Event Analysis',
september 1983 2.
Freudenthal, A. M., Garrelts, J. M., and Shinosuka, M., 1966.
'The Analysis of Structural Safety *, Journal of the structurni Division-ASCE, ST 1. February, pp. 267-325.
3 Kennedy, R. F., 1967. A statistiani An=1 vain of the h ar Stranath of Reinforced concreta Baana. Technical Report No. 78, Department of Civil Eginnering, Stanford University, Stanford, California, April 1967 A.
4.
q$ rout, D., 'A survey of Expert Opinion on Low Frobability Earthquakes",
UCLA-ENG-7515 February 1975 4
4 0
PROPRIETARY INFORMATION I
AP9mM0sn, A M4EARD cusVE UUCERTAINN 6
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- l GENERAL ELECTRIC PROPRIETARY INFORMATJON 1.4 EFERENCES 1.
GE Report on "GESSAR/11 Seismic Event Analysis".
2.
ANS-lEEE-NRC, 'PRA Procedurbs Guide," NUREG/CR-2300, January 1983.
3.
- Okrent, D., "A Survey of Expert Opinion on Low Probability Earthquake,i UCLA-ENG-75f5, February 1975.
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PROPRIETARY INFORMATION ggw peg UCL.A.suo.45 5 1.5 N
gn of tho Thi,s,^ Appendix contains an extract from a report by D. Okrent entitled CA Survey of Expert Opinion on Low Probability Earthquakes (UCLA-ENG-7515)" and dated February 1975.
Tables 1 and 2 give the names of the experts participated in the survey and the sites studied.
Table 3 provides the site questionnaire used in the survey.
The site-by-site probability estimates are included in the remaining tables.
O
.o Table 1 FARTICIPANTS IN EURVEY (in alphabetical, not numerical, order) j Professor Bruce A. Bolt Department of Geology and Geophysics University of California, Berkaley Professor David M. Boors Department of Geophysics Stanford University Frofessor Nathan M. Neumark.
Department of Civil Engineering University of Illinois at Urbana Professor Benjamin M. Page Department of Geology Stanford University Professor Stewart V. Smith Graduate Program in Geophysics University of Washington, Seattle Professor George Thompson Department of Geology Stanford University Professor James T. Wilson I
i Institute of Science and Technology University of Michigan, Ann Arbor
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, Table 2 LIST OF SITES h
Site Name (State) 1 Brunswick.
Otorch carolina) 2 Cooper Olebraska) 3 Davis Besse (Ohio) j 4
Diablo Canyon (California) 5 Grand culf Oussissippi) 1 6
Pilgrim (Massachusetts) 7 Rancho Seco (California)
S River Band 04uisiana) 9 Su m r (South Carolina) 10 Summait (pelaware) 11 Trojan.
(Oregon) 3
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Table 3 I
SITS QUssflomeAIgg 1.
same of site.
2.
he are the probabilities of occurrence per year (or recurrasca interval) of a free field earthquake at fouadation levalf a)
ISI Intensity Probability / Tear Uncertainty T
T1 T11 T111 11 I
11 111 b) peak gotisontal Ground probability / Year Uncertainty Accoloration 0.05 3*
0.10 3 0.15 3 0.20 g 0.25 g
.0.30 3 0.40 3 0.50 3 0.60 3 0.80 3 1.0 g
- 1.1 3 3.
a) ht is the dominant greguency band of the earthquaka having a pro-bability of one in 10 / year that produces the largest vitratory effects at the site?
b) h t is the probable duration of that frequency hand?
4.
he relation between let intensity and ground acceleration would you suggest or have you used for this sitet 5.
Was the presence of a saarby fault dominant in your evaluation of the site?
Comsat.
i 6.
Mas a particular tectonic structure or province significant in your evaluation of tha sitet Comment.
7.
Was seismic history significant or dominant in your evaluation of the site?
Comment.
4 8.
Are your lower probability earthquakes (e.g., one in 10 / year) deter-mined by the geology and oeismic activity of the region or by other considerations? Cosanet.
9.
ht ratie of peak vertical to peak horisontal acceleration would you estimate to be applicable (with what uncertainty)?
- 10. ht inforestion not included is the site geologic and seismic das-cription was importaut to your evaluationi eFor azaayle._9,q,13 could be taken as representing.the interval 0.025 3 <
a < 0.075 3."-
Some pa' ticipants will choose to omit some categories (or even some sites) r La their responses.
BRml8VICE Reesondent Bo.
1 2*
3 4
5
.6 7
ISI Intensity Probability per Year T
10 10-2 7x10-2 10-2 YI 10-2 10 10-2 5x10-3 10'3 VII 10'3 10 10~3 3r10~3 10-5 4
VIII 10-5 5x10' 10'3 10
10-6 II 10'I 4
lo*7 10 4
I 10 10-5 10 II 10'I 10~0
<104 III' 10'I
<10-8 Feak Borisontal Probability per Year Acceleration 05c 10-2 10 8x10~3 10-2
.15 10-3 10-5 2x10~3 10-3
.15g 10 10-6 3x10 10-5 10-5
<3x10-5 6x10-5 2x10~3 10 10-5
.23
.25g 3x10
6x10-6 10'3 10-6
.33 10'0 8x10~7 5x10 10
.4g 4x10'I
<2x10-5 10-7 53 10~7 10 10~7
.63 3x10
<10-5 10~7 4
4
.88 10
<7x10 10~7 1.03 10-8
<3x10'0 10~3 10
>1.la 10 10'I 10 Dominant Procuency and Duration for 10 /vear Earthquake Cycles /sec 2
1-2 2-5 1/3-10 Seconde 10 5
15 20 o
Probabilities per year are for acceleratione greater than the sise indicated.
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s COOPER 1
Eag-s-dent No.
1 2*
3 4
5 6
7 W Intensity Probability per Year
~3 10-2 10~1 10-2 10 V
-T1 10 10-2 3x10 5x10~3 10
~3
-2
-5
-3
~3
~7 VII 10 10 5x10 2x10 10 10
~
-8 5x10-5 10 10 VIII 10
-8 5x10"I 10
<10 11 10
<10~8 I
10 10~8
<10 II
~8
<10
~
III 10 Feak Bori'sontal Probability per Year Acceleration
-2
-3
-2
~3
~3
.053 10 10 2x10 5x10 10
.13 10 10 10 4x10~3 10-5
~3
.153 10 10 2x10 10 10-5
~3
~3
-5 10-6
.23 10 6x10 4x10 5x10
~
-8
~7 3x10-6 10 1x10 10
.253 4
~7 4x10-5 10
.33 10 4x10" 4x10" 8x10 10'
~
.43
~8 10~7 10 10
.5g 10-8
.63 3x10~8 2x10
~
~8
~8
-5
<10 I
.83 10 10
-8
-6
<10 1.0g 10
<3x10
-8
~8
<10
>1.1m 10 Dominant Frequency and Duration for 10 / year Earthauske Cycles /sec 3
3-5 2-5 2-5 1/3-10 seconds 5
3-5 15 20 Probabilities per year are for accelerations greater than the size indicated.
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13
O R&VIS RESSE 3aspondent No.
1 2*
3 4
5 6
7 3 Intensity Probability par Year V
10-1 10-2 7x1.0 10-2 10-2
-2 VI 10-2 10'3 10-2 5x10~3 10~'
VII 10-2 10~'
10 10
-6 10
-3 10 VIII 10~3 5x10~7 10 10~7
-5 11 10 10-6 10
~
1 10
<10~8 21 10~8
<10-8 III 1t
<10-8
~0 Feak Eorizontal Probability per Year Acceleration
~3
-2
.05 10~1 10-5 8x10~3 5x10 10
~3
.13 10~1 10 10 2x10 10
~1
-5
.153 10 3x10 10~3 10 10
-6
.23 10 8x10 6x10 '
10
-1
~
~
-2
-5
.253 10 6x10 10 10
.33 10 8x10 10~7
~
~
-5
~7 10~3 5x10 10
.43
-5
-8
.53 10 10-6 10
~0
-5
-8
.63 10 3x10
<10
.83 10 2x10
<10-8
~
~
-5
~0 1.03 10 1x10
<10
~
>1.13 10
<10 Dominant Frequency and Duration for 10~'/ year Earthquake Cycles /see 2
1-3 1-3 2-15 1/3-10
&aconds 10 5
5 15
<20 Probabilities per year are for accelerations greater than the size indicated.
17
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DIABLO CANYON Respondent No.
1 2*
3 4
5 6
7 W Intensity Probability per Year
-1
~1 V
10 10
-2
~1 10~1 4x10 10 10 VI
-2
~3
-2 10-2 2x10 5x10 10 411 10~3 5x10~3 3x10~3 10-3 VIII
-6 10-5 10 10 10 II
~7 K
10 10~
2x10 10
~
~
11 2x10 10
<10
<10~7 III Feak Norisontal Frobability For Year Acceleration
-3
-2
-2
~1
.053 5x10 10 4x10 10
-2
-1
~
~
~
.13 2x10 10 2x10 10 10
-3
~3
~3
-2
.153 10 7x10 5x10 10
~3
~3
~3
-2
~
.20s 1x10 10 3x10 3x10 10
~3
~3
~3
-3
.253 10 2x10 3x10 10
-3
.33 10 10 10 10'
~
-5
.43 6x10 10 3x10 2x10 10
-5 6
10-6 7x10 10 10
.53
-5
.63 3x10 10 2x10 10'
-5
-7
.83 2x10 10 10
<10
-5
-6
~
1.03 10 2x10
<10
~
~
>1.la 10
<10 Dominant Frequency and Duration for 10~0/ year Earthquake cycles /see 5
5-8 2-5 Seconds 17 15 Probabilities per year are for accelerations greater than the size indicated.
I 21
t GRAND GULF l
Respondent No.
1 2*
3 4
5 6
7 30( Intensity Probability per Year T
10-2 2x10-2 5x10 10-2
~3
~3
~3
-3 TI 3x10~3 10 5x10 3x10 10
~I
-5
~3 "i11
'10 10 5x10-5 10 10 VIII 3x10 10 5x10 10 10~7
-5
-6
~0
-5
~0 II 10 10 10
~
X 10
<10
<10~0 l
11 10 III 10
<10~
Peak i
Borizontal Probability per Year Acceleration
-2
~3
~3
~3
-2
.05g 10 2x10 10 4x10 3x10 10
~3
~
I
.13
'10 2x10 10 4x10 10
-5
~3
-5
.15g 10 10 4x10 10 10
.23 10 10 10 10 10"
~
~
~
-5
-6
.25g 10~0 10 6x10 10 10
~
~7
.33 5x10 10
~
~
.43 10 10
~
~0
~7
.53 5x10 10 10
-8
-8
.63 3x10 10
-8
.83 10
<10
-8 1.03 10
<10 4
-8
>1.la 10
<10 Dominant Frequency and Duration for 10~0/ year Earthquake Cycles /sec 1
1-2 1-3 Seconds 15 20
. " Probabilities per year are for accelerations greater than the size indicated.
I i
25
,-,--,,-----,,,-,---,-n--
'1 PILGRIM l-Respondent No.
1 2*
3 4
5 6
7 W Intensity Probability per Year
~3
-2 Y
10 10 7x10-2 10-2
~3 VI 10 10 10-2 5x10*
10 TII 3x10-5 10 10 3x10 10
~0
~3
-3
-6
~3
-6
~7 VIII 10 10 ' 3x10 2x10 10 10
-5
~
~
II 10 10~3 10
~
-5 X
2x10 10
<10
~
~
X1 10 10
<10
-8
~
_ III 10
<10 i
Peak Borisontal Probability per Year Acceleration
~1
~3
-3
-2
.053 10 10 8x10 5x10 10
-2
~3
-3
.13 10 10 2x10 10
~3
~3
.153 10 3x10 3x10 10
-5
-6
.23 10 2x10 6x10 10
.25g 10-5 6x10 2x10 10 '
10-6
-0
~3
~
~0
~7
~7
.33 4x10 3x10 10
~7
.43 3x10~
1x10 10
~3
-8
~
.53 10 10 10
~8
-5
-8
.63 2x10 3x10 3 mio
<10
-8
~
.83 10 4x10 10 (10
~3
-5
-8 1.03 10 2x10 10
<10
>1.la 10 10
<10 Dominant Prequency and Duration for 10~ / year Earthquake cycles /sec 3
5 2-5 2-15 1/3-10 Seconds 25 5-10 15 20-30
- Probabilities per year are for accelerations greater than the size indicated.
1 29
o EANCEO SECO Easpondent No.
1 2*
3 4
5 6
7 30f Intensity Probability wr Year V
10~1 10-2 3x10~1 2x10~1 10~1 VI 3x10-2 10" 7x10-2 4x10 10
-2
~1 til 10-2 10-5 10-2 3x10~3 10-6 10
-6 VIII 2x10 10 10 10 10 II 2x10 10 10 10-5 10~7
~
~8
.I 3x10 10-6 10~0 II 10 10
~0
~
III 10 10 Peak Borisontal Probability per Year.
Acceleration
~1
~3
-2
-2
~1
~1
.053 10 6x10 10 3x10 2x10 10
.ls 5x10-2 2x10 10 7x10' 4x10 10
~3
~3
~1
~1
.15s 10-2 10~3 3x10 3x10 10 10
~3
~3
~3
~3
~3
.23 2x10 10 10 8x10 10 10
-5
.25g 2x10 10 3x10 10 10
-5
-5
-6
~
i
.33 2x10 8x10 5x10 10
-6
-6
'.4s 10 3x10 2x10 2x10 10
~
~
~7
-5
~7
.53 2x10 10 10
.63 5x10 10 5x10~0 10~7 4
-5
.83 10 2x10
<10~7
~0
~0
~
l 1.03 10 10
<10
~7
>1.la 10
<10 l
Dominant Frequency and Duration for 10 / year Earthquake I
Cycles /sec 1
2-5 2-15 1/6-10 Seconds 25 16-20 15 50 0Probabilities per year are for acceleratione greater than the size indicated.
33
RIVER BIND 1
Resoondent No.
1 2*
3 4
5 6
7 WI Intensity Probability.per Year
~3
~3
-2 Y
10 10 2 mig 2 10-2 10
}10-4 10
-3 VI 10-0 10-5 5x10~3 3x10 V1f 3x10-5 10 5x10-5 10~3 10-6
-5
-7 TIII 10 10 5x10 10-5 10
~7 4
ZI 10 10 10 I
5x10
<10
~8
-8 11 10
<10
~0
~
III 10
<10 Peak Borizontal Probability per Year Acceleration
~3
-5
-3
-3
-2
.053 10 2x10 10 4x10 3x10 10
-5
.13 10-2 2x10 10 4x10 10 10
-5
~3
-5
.15s 10 10 ' 4 10 10 10
~3
~
.20s 10 10 10 10
-5
~8
~
.25g 10 6x10 10 10
~
.33 3x10 10
~7 10~7
.4g 4x10
~7
-6
.53 10 10 10"
.6s 5x10 10
.83 10' 10
~8 1.03 10
<10
<10~
>1.1x 10 Dominant Frequency and Duration for 10 / year Earthquake Cycles /see 2
3-5 8-15 1-3 1/6-10 seconds 10 5-8 20 50 0Probabilities per year are for accelerations greater than the size indicated.
1 37 l
l l
Smee1 Respondant No.
1 2*
3 4
5 6
7 W Intensity Probability per Year Y
10 10 10 10-2
-2
-2
~1 VI 10 10 3x10-2 5x10 10-2
-3
~
-3
~3
~3 TII 3x10 10 5x10 10 10
~
VIII 5x10 10 5x10-5 10 10 10
~
~
21 10~
5x10 10 10 X
10 10
~8 II 10
<10
<10~8 XII 10 Feak Borizontal
.Frobability per Year Acceleration
~1
~3
~3
-2
.053 10 10 2x10-2 5x10 10
.13 10~
10 4x10 10"
~
~3
~3
.153 10~3 10-3 10 10
.23 10 3x10 '
4x10 10
~
~0
.25g 10 10 10 10 10
~
-6
-5
.33 3x10 4x10 10
-5
-5
-5
~
.43 4x10 2x10 8x10 10 10
~
-6
-6
.53 10 10 10
~
-5
.63 5x10 1x10 10
.43 10 7x10
<10
~
1.0g 10 3x10
<10
>1.la 10
<10
-6 Dominant Frequency and Duration for 10 / year Earthquakes Cycles /see 3
5 5-8 2-5 1/3-15 seconde 10 10-15 15 15-20
- Probabilities per year are for accelerations greater than the size indicated.
41 e
i* '.
SmefIT Respondent No.
1 2*
3 4
5 6
7 ISt Intensity Probability per Year Y
10 10~3 16~1 10 10
-2
-2
-2 VI 10-2 10~3 3x10-2 5x10~3 10~3
~0
~3
-0
.TII 10 10 5x10-3 3x10
-6 10
~
10 VIII 10 10 5x10-5 10 10~7
~3
~
~I
-5 11 10" 5x10 10 10
~0
-0
-8 1
10 10
<10
~8 II 10
<10 4
III 10
<10 Peak Borisontal Probability per Year Acceleration
-2
-2
-2
-2
.053 10 10-3 2x10 10 10
-3
~3
.13 10~3 10 4x10 10
~
~3
~3
.153 10 10 10 3x10 10
-6
~0
-5
~
.23 10 2x10 10 4x10 10 10
~3
-6
.25g 3x10 10 10 10
.33 10 4x10-5 5x10 10
-6
~
-7
.43 4x10 1x10~
8x10~
2x10 10
~
-5
~
~
.53 10 10 10
-6
-8
.63 3x10 7x10 10
-8 10~8 4x10 10
.83 1.03 10 2x10 10-6
<10
-8
>1.la 10~0
<10
~0 Dominant Prequency and Duration for 10 / year Earthquake Cycles /sec 2
3 5-8 2-5 1/3-15 Seconds 10 10-15 15 30
- Probabilities per year are for accelerations greater than the else indicated.
i 45 8
6
---n.
[,*'.'(
w h
Tn0JAN f
Respondent No.
1 2*
3 4
5 6
7 30( Intensity Probability per Year
~1
-2
~1
-2
~1 T
10 10 3x10 5x10 10
-2
~3
-2
-2
-2 YI 10 10 7x10 3x10 10
~3
~3
-2
~3
~3
~~TII 10 10 10 5x10 10 VIII 10 10 10 2x10 10 10 '
~3
~
~
II 10 10 10 '
10 10
~
~
~
~
~8
~
X 10 10 10 XI 10
<10
~
~
III 10
<10 Peak Norisontal Probability per Year Acceleration
~1
-2
~1
-2
-2
.053 10 10 3x10 540 10
-2
~1 i
.13 10 10 10 740 3x10 10"
~
~
~
~3
~3
~3
.153 10 10 '
10 3x10 540 10
-2
~
~3
~3
~
~
.23 10 10 840 3x10 10
.253 3x10 10 3x10 2x10 10 10 '
~3
~3
~
~
~
.33 10 8x10 1x10 10 '
~3
~3
~
~
10" 4 x10 '
1.6x10 240 10 '
~
~
~
.43 4
.53 10 10 10
-5 10'.
2x10 10"
.63
~0
~8
.83 10 740 10
-6 1.03 10 3x10
<10
~I
~
>1.la 10
<10
-6 Dominant Frequency and Duration for 10 / year Earthquake cycles /sec 1
5 1-5 2-5 1/4-10 seconds 15 few 15 30 Probabilities per year are for accelerations greater than the size indicated.
i 49
PROPRIETARY INFORMATION A W G M Olx, S COMPouuur uacG7zrAsuTV e
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l i
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