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GVDSA
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Seismicity Recorded at GVDSA 7/89 - 8/98
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Magnitude
N
km
1 2 3 4 5
0
50
Fig. 5.7. Location of Garner Valley (redtriangle), recorded seismicity(circles),
shaded relief,and faults (black lines)
todecomposed granitefrom18to25m.Decomposed graniteconsistingofgravellysand
existsbetween25and88m.At88mthecontactwithhardcompetentbedrockisreached.
The bedrock is granodiorite of the Southern California Peninsular Ranges batholith. The
watertablefluctuatesattheGarnerValleysitedependingontheseasonandrainfalltotals.
Inthewetteryearsthewatertableisat,orjustbelowthesurfaceinthewinterandspring
months. In the summer and fall months, or the entire dry years, the water table drops to
1 to3mbelow the surface.
2.2.3. Garner Valley SFSI structure
The Garner Valley Soil-Foundation-Structure Interaction (SFSI) test facility is com-
posedofamedium-scalereconfigurablesteel-framestructurefoundedonarigidmassive
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