macro seismic hd lhazard analysisnceg.uop.edu.pk/bgworkshop08/lectureslides/day5/l03... ·...
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h d lMacro seismic hazard analysis
Dr. Mark van der [email protected]
INTERNATIONAL INSTITUTE FOR GEO-INFORMATION SCIENCE AND EARTH OBSERVATION
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Seismic hazard analysis
What is actually seismic hazard analysis?y y????
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Seismic hazard vs. risk
Seismic risk = seismic hazard * exposure * pvulnerability * cost
Seismic hazard – The probability of experiencing a specific ground shaking experiencing a specific ground shaking at a specific site or region due to earthquakesearthquakes.
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Seismic risk analysis
Macro seismic hazard analysisDeterministic seismic hazard analysis (DSHA)Probabilistic seismic hazard analysis (PSHA)
Micro seismic hazard analysisSoft ground effects analysisLiquefaction analysis
Vulnerability and risk analysisB ildi l bili l bili Building vulnerability, vulnerability curvesRADIUS, HAZUS approachCase studiesCase studies
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Seismic hazard analysis
Which factors do you need to investigate y gto perform a seismic hazard analysis
?????
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Macro seismic hazard analysis
Deterministic seismic hazard analysis (DSHA)Use a single scenario
Select a single magnitude, MSelect a single distance RSelect a single distance, RAssume effects due to M, R
Probabilistic seismic hazard analysis (PSHA)Assumes many scenarios
Consider all magnitudesConsider all distancesConsider all effects
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Earthquake source, wave propagation and site effect
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Seismic hazard analysis model
fault(line source) R M
)
log N = a – b M
ccel
erat
ion)
mean + σ
f ( M, R)
site(line source) R
R
log
N (m
>M
M0 M peak
gro
und
ac
mean -σ
area source
Source zonationmagnitude M
M0 Mmax
Seismicitylog (R)lo
g (p
Attenuation
catio
n
fexc
eeda
nce
0.1) velo
city
h = 0.05h = 0.1h = 0.2
ampl
ific
prob
abili
ty o
f
P (a > A)
P = 0.1
a (P
=0
(pse
udo)
v
h - damping
frequencySite response
acceleration (A)Seismic hazard
frequencyResponse spectrum
After Cornell
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Deterministic Seismic Hazard Deterministic Seismic Hazard Analysis
DSHA
INTERNATIONAL INSTITUTE FOR GEO-INFORMATION SCIENCE AND EARTH OBSERVATION
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Deterministic seismic hazard analysis (DSHA)y ( )
Earliest approach taken to seismic pphazard analysisOriginated in nuclear power industry Originated in nuclear power industry applicationsStill used for some significant structuresStill used for some significant structures
Nuclear power plantsL dLarge damsLarge bridges
d i f ili iHazardous waste containment facilities
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DSHA: methodology
1. Identification and characterization of all sources
2 Selection of source-site distance 2. Selection of source site distance parameter
3 Selection of “controlling earthquake”3. Selection of controlling earthquake4. Definition of hazard using controlling
th kearthquake
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Zonation
INTERNATIONAL INSTITUTE FOR GEO-INFORMATION SCIENCE AND EARTH OBSERVATION
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Zonation using RS
Almost no region in the world is free of tectonic activitiyactivitiy
Seismic/tectonic activity leaves marks in the Seismic/tectonic activity leaves marks in the landscape
These landmarks indicate neo-tectonic activity and movements
Map these landmarks through RS for fault identificaton
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Zonation
Factors related to zonationOccurrence of earthquakesVisible faultsVisible faultsEarthquake mechanismFrequency of earthquakesFrequency of earthquakes
Often iterative process between the Often iterative process between the various steps in SHA
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DSHA: Identification and characterization of all sources (1)( )
Identification of all sources capable of producing significant ground motion at the site
Large sources at long distancesSmall sources at short distances
D t Data sources:Earthquake catalogsSeismo tectonic studiesSeismo-tectonic studies
CharacterizationDefinition of source geometryDefinition of source geometryEstablishment of earthquake potential
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DSHA: Identification and characterization of all sources (3)( )
Estimate maximum magnitude that gcould be produced by any source in vicinity of siteyFind value of Rmax - corresponds to Mmaxat threshold value of parameter of at threshold value of parameter of interest: Ymin
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DSHA: Identification and characterization of all sources (4)( )
Characterize geometryg yPoint source
Constant source-site distanceSource
Volcanoes, distant short faults
Linear sourceSite
One parameter controls distanceShallow, distant fault
Site
SourceSource
Site
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DSHA: Identification and characterization of all sources (5)( )
Characterise geometryg yAreal source
Two geometric parameters control distanceg pConstant depth crustal source
Volumetric sourceThree parameters control distance
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DSHA: Select source-site distance parametersp
Typically assume shortest source-site yp ydistance Rmin (“worst case” scenario)
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DSHA: Select controlling earthquake
Calculate using attenuation relationships what the expected PGA or SA will be at the site (function of R and Magnitude)The earthquake that produces the highest PGA or SA will be the “controlling earthquake”Typical GIS analysis
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Attenuation
Attenuation: seismic waves become eaker as the
Camparison of attenuation curves (M =7)
become weaker as they travel outward from the source
0 40.50.60.70.8
erat
ion
(g)
Various models possible for attenuation
local vs. regional vs. 0.00.10.20.30.4
Max
acc
ele
continentalDifferent sources (type and size of earthquake
0.1 1 10 100
Fault distance(km)
Joyner&Boore(1981)
Joyner & Boore (1981) seismic wave attenuation function used in Indian
Joyner&Boore(1981)Campbell(1981)Fukushima&Tanaka(1990)
PGA=10^(0.249*M-Log(D)-0.00255*D-1.02)subcontinent
( g( ) )PGA = Peak Ground Acceleration (in g)D = Hypocentral distance (in km)M = Magnitude
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Probability of exceedence
ance
lity
of e
xcee
da
P (a > A)
(P=0
.1)
prob
abil a
acceleration (A)
P = 0.1
acceleration (A)
Seismic hazard
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Ground motion prediction
Probability of exceedanceGround motion prediction
R = R1
yp
M = M1p = 0.5
p (a
=A)
log
(A) p = 0.1
R1
log (A) Epicentral distance (R)
A – Peak Ground Acceleration (PGA) or Peak Ground Velocity (PGV)Hazard = probability of exceeding a ground motion level within time period T.
P(a>A) = f(a>A|m,r) p(m) p(r) dm dr
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DSHA: Comments
DSHA produces “scenario” earthquake for design (design earthquake)g ( g q )As commonly used, produces worst-case scenarioDSHA provides no indication of how likely design earthquake is to occur during life of structurestructureDesign earthquakes may occur every 200 yrs in some places, every 10 000 in otherso e places, eve y 0 000 ot eDSHA can require subjective opinions on some input parametersVariability in effects not rationally accounted for
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Probabilistic Seismic Hazard Analysisy
(PSHA)(PSHA)
INTERNATIONAL INSTITUTE FOR GEO-INFORMATION SCIENCE AND EARTH OBSERVATION
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PSHA
Goal: to quantify the rate (or q y (probability) of exceeding various ground-motion levels at a site, given all g , gpossible earthquakesTraditionally: Peak Ground Acceleration Traditionally: Peak Ground Acceleration (PGA) used to quantify ground motionToday: Response Spectral Acceleration Today: Response Spectral Acceleration (SA) preferred – expected SA in accordance to the natural frequency of accordance to the natural frequency of the building
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PSHA (cont’d)
Input:S i i it d l
o seismicity distribution in space (area) and time o magnitude-frequency distribution
• Seismicity model:
g q yo Mmax – maximum possible earthquake
• Ground motion prediction equation (given M and hypocenter)
Output:- probability of exceeding a ground motion level within time period T
• Site response model (not discussed here)
probability of exceeding a ground motion level within time period T.
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PSHA
PSHA characterises uncertainty in ylocation, size, frequency and effects of earthquakes and combines all of them qto compute probabilities of different levels of ground shakingg g
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PSHA: methodology
1. Identification and characterization of all sources
2 Characterization of seismicity of each 2. Characterization of seismicity of each source
3 Determination of motions from each 3. Determination of motions from each source
4 P b bili ti l l ti4. Probabilistic calculations
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PSHA: uncertainties
Uncertainty in source-site distanceyDistribution of earthquake magnitudes
Gutenberg-Richter Recurrence lawGutenberg-Richter Recurrence law
Predictive relationshipsT l iTemporal uncertaintyCombining uncertainties – probability computations
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Examples
INTERNATIONAL INSTITUTE FOR GEO-INFORMATION SCIENCE AND EARTH OBSERVATION
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Influence of seismicity areal distribution
Observe the very large difference between the zonations!
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Different approaches for DSHA analysis
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Example India
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Example India
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Exercises
See separate document in data folder for exercise
INTERNATIONAL INSTITUTE FOR GEO-INFORMATION SCIENCE AND EARTH OBSERVATION