Tule Pond Paleoseismology Photo Gallery, September - October 2001

Digging a paleoseismic trench at Tule Pond on the Hayward fault

September 28, 2001

On September 28, 2001, paleoseismologists from the U.S. Geological Survey opened a trench on the southern Hayward fault at a site called Tule Pond, also known as Tyson's Lagoon, just south of the Fremont BART (Bay Area Rapid Transit) station in Fremont, California.

Digging the trench. Digging the trench. Digging the trench. Digging the trench.

Taking a peel from the wall of the trench

October 2, 2001

On Tuesday October 2, 2001 Japanese scientists from the Geological Survey of Japan and Hiroshima University, along with USGS scientists, generated a peel of the southern trench wall at Tule Pond. By using a rubberized epoxy material, scientists removed a section of the south wall of the trench.

Taking a peel from the trench wall. Taking a peel from the trench wall. Taking a peel from the trench wall. Taking a peel from the trench wall. Taking a peel from the trench wall. Taking a peel from the trench wall.

Using the Geoslicer

October 3, 2001

Then, on Wednesday, October 3, again at the Tule Pond location, Japanese and American scientists demonstrated the Geoslicer, a large, crane-operated device. The Geoslicer was placed in the bottom of the existing 10-foot-deep trench, where it cut an additional 12-foot-deep section of geologic deposits, and brought it, intact, to the surface for examination by the scientists.

Using the Geoslicer. Using the Geoslicer. Using the Geoslicer. Using the Geoslicer. Using the Geoslicer. Using the Geoslicer. Using the Geoslicer. Using the Geoslicer. Using the Geoslicer. Using the Geoslicer. Using the Geoslicer. Using the Geoslicer. Using the Geoslicer. Using the Geoslicer. Using the Geoslicer. Using the Geoslicer.