A ~100-m deep borehole seismometer was installed approx. 25 m east of the Factor building in the UCLA Botanical Gardens (map). Instrumentation consists of a three-component Kinemetrics shallow borehole Episensor at the bottom of the hole, a three-component Episensor at the wellhead, and a Quanterra 4128 digitizer located in a garden toolshed a few meters from the borehole. Ground motions are being recorded on the digitizer that is connected to the UCLA intranet. The data are being stored as part of the building array database and can be viewed via the Real-time Waveform Viewer. The purpose of the borehole waveform data is to understand the relationship between free-field incident waves and the building response to strong ground shaking. The soil amplification effects can be separated out of the near-surface ground motion. This in turn will allow the input ground motion to be separated from the building response.

See Drilling the Borehole for photos and data associated with the borehole drilling in July, 2004.
Click here for Soil Sampling Data.