Micro Seismic Hazard Analysis

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Nakamura’s or H/V method (1)• Summary:• Dividing the Horizontal Response spectrum (H) by theVertical Response spectrum (V) yield a uniform curvein the frequency domain for different seismic events• Assumption: since different seismic event yield thesame H/V curve, it is possible to determine thisusing microtremors• H/V curve show a peak in amplification at thefundamental frequency of the subsurface – that iswhen the resonance occurs• By setting up a dense seismic network measuringthose microtremors it is possible to carry out amicrozonation without intensive borehole surveys
Nakumura’s or H/V method (2)• Establish empirical transfer functions T H andT V on the basis of the horizontal and verticalmicrotremor measurements on soil surfaceand at bedrock level:TH=SSHSHBS HB S VBT H T VTV=SSVSVBBedrockS HSS VSSoilS HBS VB
Page 3 and 4: Basic physical concepts and definit
Page 7 and 8: Site effects due to low stiffness s
Page 9: Site effects due to low stiffness s
Page 12 and 13: Characteristic site period• The p
Page 14 and 15: Natural frequency of buildings• A
Page 16 and 17: Examples of natural frequencies ofb
Page 18 and 19: Vertical standing waves• Vertical
Page 20 and 21: Summarising: building resonance and
Page 22 and 23: Soft ground effect - summary• Sof
Page 24 and 25: MichoacanearthquakeCollapsed 21-Sto
Page 26 and 27: Theoretical methods• Numerical me
Page 28 and 29: How do we carry out a groundrespons
Page 30 and 31: What do we use to quantify theexpec
Page 32 and 33: SHAKE• The equivalent linear appr
Page 34 and 35: 1D ground response analysisAssumpti
Page 36 and 37: Transfer Function as technique for
Page 38 and 39: Define the transfer function (2)•
Page 40 and 41: Effect of transfer function onAmpli
Page 42 and 43: Procedure to account for nonlineari
Page 44 and 45: General, simplified profile as assu
Page 46 and 47: Standard Spectral Ratio Technique (
Page 50 and 51: Nakumura’s or H/V method (3)• M
Page 52: Nakumura’s or H/V method (5)• I
Page 55 and 56: Site effects due to surface topogra
Page 57 and 58: Liquefaction
Page 59 and 60: Liquefaction - general (2)• Commo
Page 61 and 62: Liquefaction - governing factors (2
Page 63 and 64: Liquefaction - governing factors (4
Page 65 and 66: Liquefaction - governing factorssum

Micro Seismic Hazard Analysis

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