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Recent CSMIP/Caltrans Downhole Array Data and their Application in Site Specific Analysis

Recent CSMIP/Caltrans Downhole Array Data and their Application in Site Specific Analysis H. Haddadi 1 , V. Graizer 1 , A. Shakal 1 , P. Hipley 2 1 – California Geological Survey, Office of Strong Motion Studies

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Recent CSMIP/Caltrans Downhole Array Data and their Application in Site Specific Analysis

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  1. Recent CSMIP/Caltrans Downhole Array Data and their Application in Site Specific Analysis H. Haddadi1, V. Graizer1, A. Shakal1, P. Hipley2 1 – California Geological Survey, Office of Strong Motion Studies 2 – California Department of Transportation (Caltrans), Office of Earthquake Engineering

  2. California Strong Motion Instrumentation Program(CSMIP) operates 13 geotechnical arrays throughout the state of California, 8 of them instrumented with the support of Caltrans.

  3. More than 60 low amplitude recordings from earthquakes with 2.4<M<7.1 were recorded. • The strongest acceleration of about 0.5g was recorded at the Los Angeles La Cienega array during the M4.2 earthquake of Sep. 9, 2001 (Epicentral Distance: 2.7 km, Depth: 8 km).

  4. Los Angeles - La Cienega Geotech Array M4.2 Earthquake of Sep 9, 2001 (D= 2.7 km) Acceleration (g) South East Up

  5. M4.2 Earthquake of Sep. 9, 2001 (South Comp) and S- wave velocity profile Los Angeles - La Cienega Geotech Array S_wave Velocity (m/s)

  6. Comparison of Ground Motion and One Dimensional Model M4.2 Earthquake of Sep. 9, 2001 (South Comp) Los Angeles - La Cienega Geotech Array

  7. Comparison of Ground Motion and Shake91 Model at the Surface M4.2 Earthquake of Sep. 9, 2001 (South Comp) Los Angeles - La Cienega Geotech Array

  8. Eureka Geotech Array P_ and S_ Wave Velocity Profile

  9. M5.1 Earthquake of June 17, 2002 (D= 37 km) Eureka Geotech Array Acceleration (g) South East Up

  10. Close View of Acceleration Time Histories M5.1 Earthquake of June 17, 2002 (South Comp) Eureka Geotech Array Max Acc: 0.03 (g) Surface -19 m 0.015 -33 m 0.012 -56 m 0.012 -136 m 0.007

  11. Correlation Analysis M5.1 Earthquake of June 17, 2002 (South Comp) Eureka Geotech Array Surface -19 m -33 m -56 m -136 m

  12. M7.1 Hector Mine Earthquake of Oct 16, 1999, East Comp (D= 203 km)Los Angeles - La Cienega Geotech Array Acceleration (g) Velocity (cm/sec) Displacement (cm)

  13. Particle Motion of Hector Mine Earthquake (Oct. 16, 1999) at the Surface Los Angeles - La Cienega Geotech Array Horizontal Plane Vertical Plane Up T R R

  14. Particle Motion of Hector Mine Earthquake (Oct. 16, 1999) at the Surface Vincent Thomas Geotech Array HorizontalPlane Vertical Plane T Up R R

  15. Summary • CSMIP operates 13 geotechnical arrays in California. More than 60 low amplitude recordings from earthquakes with 2.4<M<7.1 are recorded. • Processed data of Geotechnical arrays are available at: ftp://ftp.consrv.ca.gov/pub/dmg/csmip/GeotechnicalArrayData • Dynamic properties of soil (such as wave velocity and amplification) are studied using the records of Geotech arrays. • Shake91 model worked well for simple source and vertical wave propagation cases. • Basin Effect is observed in surface wave records of Geotech Arrays in Los Angeles area during the Hector Mine Earthquake.

  16. Maximum Amplitude and Arrival Time of Displacement M7.1 Hector Mine Earthquake of Oct 16, 1999 Los Angeles – La Cienega Geotech Array

  17. Maximum Amplitude of Displacement and Arrival Time at different Directions M7.1 Hector Mine Earthquake of Oct 16, 1999 Vincent Thomas Geotech Array

  18. La Cienega Geotech Array Spectral Ratio Of Hector Mine Earthquake

  19. Eureka Geotech Array M5.1 Earthquake of June 17, 2002 Correlation Analysis of Vertical Component Surface -19 m -33 m -56 m -136 m

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