Seismic Geotechnical Hazard Zonation Of Geological Factors

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1 1 st Workshop of M.E.E.T.I.N.G Project Seismic Geotechnical Hazard Zonation Of Geological Factors Maja Oštri, dipl.ing.geol Dubrovnik, March 3rd-4th 2008

2 SUBJECT OF THE INVESTIGATION? Geological Factors In Seismic Geotechnical Hazard Zonation

3 Subject of the investigation in the context of M.E.E.T.I.N.G. Project (Mitigation of The Earthquake Effects in Towns and Industrial Regional Districts) HAZARD ZONATION??? MITIGATION

4 HAZARD EVALUATION/ ASSESSMENT HAZARD MAPS procedure HAZARD REPORTS + products MITIGATION CODES subjects of investigation of the M.E.E.T.I.N.G. project GUIDELINES

5 HAZARD EVALUATION/ ASSESSMENT HAZARD MAPS HAZARD REPORTS procedure + products MITIGATION CODES subjects of investigation of the MEETING project GUIDELINES

6 RELATIVE FACTOR IMPORTANCE INPUT DATA OVERLAY CLASSIFICATION OF QUANTITATIVE HAZARD HAZARD ZONATION

7 GEOLOGICAL FACTORS??? GEOTECHNICAL HAZARD ZONATION GEOLOGICAL FACTORS IN SEISMIC GEOTECHNICAL ZONATION? answer to that question requires additional explanations

8 ASSIGNEMENT OF HYPOTHETICAL EARTHQUAKE GROUND MOTION INTENSITY ON REFERENCE GROUND DISTRIBUTION OF GROUND MOTION INTENSITY Earthquake catalog Active Fault Map Isoseismal Maps Strong Motion Records Geology Geotechnical investigations PSHA DSHA PGA I, SA SEISMICITY ATTENUATION LOCAL SITE EFFECTS Seismic hazard Seismic (macro)zonation microzonation

9 1 st Workshop of M.E.E.T.I.N.G Project LIQUEFACTION GEOLOGICAL CRITERIA Quarternary Geologic Map DEPTH TO GROUNDWATER GEOTEHNICAL CRITERIA Borehole data, SPT, CPT tests Soil properties Local seismicity PGA, M,D LIQUEFACTION RELATED POTENTIAL HAZARDS: Flow slides Lateral spreads Settlements Surface manifestation Analysis SIMPLIFIED PROCEDURE Seed & Idriss SUSCEPTIBILITY OPPORTUNITY POTENTIAL Dubrovnik, March 3rd-4th 2008

10 GEOLOGICAL FACTORS Macrozonation (tectonic, structural data) Microzonation (geologic units) Scale of Hazard Map - quality and quantity of data Seismic hazard: ground motion, liquefaction, slope instabilities

11 THEORETICALY very complex issue PRACTICALY EUROCODE 8 implementation National Annexes Croatian seismic codes GUIDELINES Seismic Geotechnical Hazard Zonation Geological Input Maps

12 California, USA

13 SEISMIC HAZARD MAPPING ACT Purpose: reduce threat to public health and safety minimize loss of life and property identification and mitigationof seismic hazard GUIDELINES FOR EVALUATING AND MITIGATING SEISMIC HAZARDS IN CALIFORNIA SPECIAL PUBLICATION 117, 1992; REVISED SPECIAL PUBLICATION 118, 2004 investors/owners engineers state/county/city agencies Recommended procedures for implementation of SP 117, Guidelines for Analyzing and Mitigating Landslide Hazards Liquefaction in California SCEC, 2002 SCEC, 1999

14 Historic records, field observations computer- mapping technology Seismic Hazard Zone Map Maps that show ZONES OF REQUIRED INVESTIGATION areas where site investigations are required to determined the need for mitigation of potential liquefaction and/or earthquake induced landslide ground displacements Land Use Planning Construction

15 Historic records, field observations computer- mapping technology Seismic Hazard Zone Map Maps that show ZONES OF REQUIRED INVESTIGATION areas where site investigations are required to determined the need for mitigation of potential liquefaction and/or earthquake induced landslide ground displacements Land Use Planning Construction

16 Seismic Hazard Zone Map Seismic Hazard Zone Report Potential Seismic Hazard SITE- INVESTIGATION REPORT SCREENING INVESTIGATIONS available data clearly demonstrate absence of potential hazard QUANTITAIVE EVALUATION Analysis Liquefaction Landslides

17 Seismic Hazard Zone Act State Mining & Geology Board Advisory Commitee Adopts Policies Provide Technical Assistance State Geologist CGS Evaluate Regional Seismic Hazard Designate Seismic Hazard Zones Provide Advisory Services Cities & Counties Require Site Investigations Update General Plans Approves Project Owners/ developers Determines Hazard at Site Mitigates Hazard

18 DATA REQUIREMENTS FOR SEISMIC ZONATION! PSHA Geology Geotehnical Terrain GW HAZARD ZONES

19 DATA REQUIREMENTS FOR SEISMIC ZONATION! PSHA Geology Geotehnical Terrain GW HAZARD ZONES Seismic Code Seismic Code 31/81, 49/82,29/83,20/88, 52/90) Seismic Map SFRJ, 1987 Seismic Intensities, for category II, EC8 PGA,ground type A 475 YRS 500 yr return period

20 DATA REQUIREMENTS FOR SEISMIC ZONATION! PSHA Geology Geotehnical Terrain GW HAZARD ZONES OGK 1 : bedrock surficial deposits, 3D-depth

21 DATA REQUIREMENTS FOR SEISMIC ZONATION! PSHA Geology Geotehnical Terrain GW HAZARD ZONES no geotehnical data base!

22 DATA REQUIREMENTS FOR SEISMIC ZONATION! PSHA Geology Geotehnical Terrain GW HAZARD ZONES topographic data exist; DTM 1 : data on groundwater levels for Zagreb are available Hydrogeological data base

23 1 st Workshop of M.E.E.T.I.N.G Project SEISMIC MICROZONATION Urban areas of: Rijeka 1974 Dubrovnik 1983 Zagreb 1988 Pravilnika o tehnikim normativima za izgradnju objekata visokogradnje u seizmikim podrujima (Službeni list SFRJ 31/81, 49/82, 29/83). Same methodology used Medvedev (1977) Ground motions Liquefaction Landslides G - - Dubrovnik, March 3rd-4th 2008

24 1 st Workshop of M.E.E.T.I.N.G Project Thank you for Your attention! Dubrovnik, March 3rd-4th 2008

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