Micro Seismic Hazard Analysis

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Liquefaction – governing factors (1)1. Earthquake intensity and duration(basically a high magnitude)• Threshold values: a max > 0.10 g; M L > 52. Groundwater table• Unsaturated soil above gw table will NOTliquefy3. Soil type: non-plastic cohesionless soil• Fine-medium SAND, or• SAND containing low plasticity fines (SILT)
Liquefaction – governing factors (2)4. Soil relative density (D r )Loosely packedDensely packed5. Grain size distributionPoorly graded(Well sorted)Well graded(Poorly sorted)
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 48 and 49: Nakamura’s or H/V method (1)• S
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: Liquefaction - general (2)• Commo
Page 63 and 64: Liquefaction - governing factors (4
Page 65 and 66: Liquefaction - governing factorssum
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Micro Seismic Hazard Analysis

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