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Published October 1991 | public
Book Section - Chapter

In-situ calibration of USGS piezometer installations


Among the few potentially liquefiable sites around the world that have been permanently instrumented with pore-pressure transducers and accelerometers, only the Wildlife Site in the Imperial Valley, California has liquefied during an earthquake. Acceleration and pore pressure. data were recorded at the Wildlife Site during the magnitude 6. 6 Imperial Valley earthquake of 24 November 1987 which resulted in liquefaction of the site. Some unusual aspects were observed in the data, including long rise times of the pore pressures and a time lag between the strong ground shaking and maximum pore pressure development.

Additional Information

© 1991 American Society of Civil Engineers. This investigation was performed by The Earth Technology Corporation and California Institute of Technology and supported by Grant No. 14-08-0001-G1711 from the United States Geological Survey (USGS). We wish to thank Mr. Ronald Porcella of the USGS, for his critical assistance in the testing program at Wildlife Site. Special thanks are also due to Dr. Dennis Ostrom and Mr. Gene Hawkins from the Southern California Edison Company for their contribution in performing the popper tests. We would also like to specially thank Dr. Tom Holzer from the USGS and Professor Leslie Youd from Brigham Young University for their interest and support in completing this work.

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August 20, 2023
October 18, 2023