ML21272A009
| ML21272A009 | |
| Person / Time | |
|---|---|
| Issue date: | 01/29/2020 |
| From: | Scott Stovall Office of Nuclear Regulatory Research |
| To: | |
| S. Stovall | |
| Shared Package | |
| ML21272A001 | List: |
| References | |
| Download: ML21272A009 (13) | |
Text
Garner Valley Downhole Array (GVDA)
By Scott Stovall USNRC 1
Garner Valley Downhole Array
Geotechnical Data
- Near-surface stratigraphy consists of 18-25 m of lake-bed sediments consisting of alternating layers of sand, silty sand, clayey sand, and silty gravel.
- Decomposed granite classified as gravely sand exists between 25m and 88 m until granite bedrock is reached From Steller 1996
Shear Modulus and Damping From Stokoe and Darendeli 1998
Downhole Array From Steidl et al. 2010
Borehole Velocity Measurements 0
10 20 30 40 50 60 70 80 90 100 0
500 1000 1500 2000 Depth (m)
Shear Wave Velocity (m/sec)
Downhole, Gibbs 1989 0
10 20 30 40 50 60 70 80 90 100 0
500 1000 1500 2000 Depth (m)
Shear Wave Velocity (m/sec)
PS Logging, Steller 1996
SASW 0
5 10 15 20 25 30 0
200 400 600 800 Depth (m)
Shear Wave Velocity (m/sec)
SASW, Stokoe et al. 2004 Line 1 Line 2 Lines 3, 4 and 5
Velocity Profiles 0
10 20 30 40 50 60 70 80 90 100 0
500 1000 1500 2000 Depth (m)
Shear Wave Velocity (m/sec)
SASW Line 1 SASW Line 2 SASW Lines 3, 4 and 5 PS Logging Downhole
MASW and MAM Arrays From Teague et al. 2018
Microtremor Array Measurement From Teague et al. 2018
Inverted Profiles From Teague et al. 2018
R < 25 km R < 50 Km R < 100 km R < 200 km 1.5-2.5 2.5 -3.5 3.5 - 4.5 4.5 - 5.5 5.5 -6.5 7877 180 10 1
0 8729 518 48 5
0 8729 750 167 9
0 8729 750 231 45 2
Events Magnitude R < 25 km R < 50 Km R < 100 km R < 200 km Recorded Strong Ground Motions
References J.F. Gibbs, "Near-surface P-and S-wave velocities from borehole measurements near Lake Hemet, California," U.S. Geological Survey Open File Report; 1989 Steller, R (1996). New Borehole Geophysical Results at GVDA Steidl, J.H, Seal S.W, and Civilini F (2010) Observations and Analysis of Ground Motion and Pore Pressure at the NEES Instrumented Geotechnical Field Sites, Poster, http://nees.ucsb.edu/facilities/GVDA Stokoe, K. H., and M. B. Darendeli (1998). Laboratory evaluation of the dynamic properties of intact soil specimens, Garner Valley, California, Institute for Crustal Studies Internal Report Stokoe KH, Kutulus A, Menq FY. SASW measurements at the NEES Garner Valley test site, California. University of Texas at Austin, College of Engineering Data Report; 2004.
David P. Teaguea, Brady R. Cox, Ellen M. Rathje (2018), Measured vs. predicted site response at the Garner Valley Downhole Array considering shear wave velocity uncertainty from borehole and surface wave methods, Soil Dynamics and Earthquake Engineering, 113 p 339-355