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Comprehensive Overview of Seismic Hazards and HAZUS Methodology by URS Corporation

This document by Ivan Wong from URS Corporation outlines the key seismic hazards considered in HAZUS, including ground motion, liquefaction, and tsunami effects. It details sources for ground motion input—ranging from scenario earthquakes to probabilistic hazard maps—and explains the calculation methods for estimating ground motions. Additionally, it introduces the NEHRP site categories and discusses the importance of region-specific hazard mapping for improving HAZUS results by integrating local source and site effects.

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Comprehensive Overview of Seismic Hazards and HAZUS Methodology by URS Corporation

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  1. EARTH SCIENCE ASPECTS OF HAZUS Ivan WongSeismic Hazards Group URS CorporationOakland, CA

  2. HAZARDS CONSIDERED IN HAZUS • Ground Motion • Ground Failure • Liquefaction (Settlement and Lateral Spreading) • Landslide • Surface Fault Rupture • Tsunami / Seiche

  3. SOURCES OF GROUND MOTION INPUT IN HAZUS • Deterministic Analysis (Scenario Earthquakes) • User specifies location and earthquake magnitude • WUS fault, historical epicenter, or arbitrary epicenter • USGS National Probabilistic Hazard Maps(500 and 2500 yr maps) • User-Supplied Deterministic or Probabilistic Hazard Maps

  4. CALCULATION OF SCENARIO GROUND MOTIONS IN HAZUS • Select scenario earthquake • Use rock attenuation relationships • Standard shape of response spectra (pga, pgv, 0.3 and 1.0 sec SA) • Amplify rock ground motions using 1997 NEHRP Provisions

  5. WESTERN U.S. ATTENUATION RELATIONSHIPS IN HAZUS • Boore et al. (1993; 1994) • Sadigh et al. (1993) • Campbell and Bozorgnia (1994) • Munson and Thurber (1997) - Hawaii • Youngs et al. (1997) - Subduction Zones

  6. 1997 NEHRP SITE CATEGORIES A Hard Rock (> 1500 m/sec) B Rock (760 - 1500 m/sec) C Very Dense Soil and Soft Rock (360 - 760 m/sec) D Stiff Soils (180 - 360 m/sec) E Soft Soils (< 180 m/sec) F Soils Requiring Site-Specific Evaluations

  7. SOIL AMPLIFICATION FACTORS

  8. HOW CAN HAZUS RESULTS BE IMPROVED? Answer: Develop hazard maps at a fine special resolution which incorporate region- and local-specific source, path, and site effects

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