Spatial variation of earthquake ground motion for application to soil-structure interaction
- Bechtel Civil, Inc., San Francisco, CA (United States)
The spatial variation of strong ground motion from fifteen earthquakes recorded by the Lotung LSST strong motion array is analyzed. The earthquakes range in magnitude from 3.7 to 7.8 and in source distance from 4 to 80 km. In all a total of 533 station pairs are used with station separations ranging from 60 to 85 meters. The spatial variation of ground motion is divided into two parts: variation in the fourier phase (coherence), and variation in the Fourier amplitude. Empirical functions describing the frequency and separation distance dependence of the coherency and amplitude variation appropriate for use in engineering analyses are derived. Taken together, the spatial variation functions given in this study provide a complete description of the statistical properties of the horizontal components of the seismic wavefield assuming plane wave propagation for the S-wave window. Since the S-waves generally cause the largest shaking, these spatial variation functions are appropriate for use in engineering analyses of large structures.
- Research Organization:
- Electric Power Research Inst., Palo Alto, CA (United States); Bechtel Civil, Inc., San Francisco, CA (United States); Woodward-Clyde Consultants, Pasadena, CA (United States)
- Sponsoring Organization:
- EPRI; Electric Power Research Inst., Palo Alto, CA (United States)
- OSTI ID:
- 5306777
- Report Number(s):
- EPRI-TR-100463-Tier1
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
EARTHQUAKES
GROUND MOTION
SPATIAL DISTRIBUTION
SEISMIC EVENTS
FORECASTING
AMPLITUDES
COMPILED DATA
FOURIER ANALYSIS
GEOLOGY
MATHEMATICAL MODELS
MONITORING
REGRESSION ANALYSIS
SEISMIC S WAVES
SOIL-STRUCTURE INTERACTIONS
TAIWAN
ASIA
DATA
DISTRIBUTION
INFORMATION
ISLANDS
MATHEMATICS
MOTION
NUMERICAL DATA
SEISMIC WAVES
STATISTICS
580000* - Geosciences