Development of characterization technology for fault zone hydrology
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Abstract
Several deep trenches were cut, and a number of geophysical surveys were conducted across the Wildcat Fault in the hills east of Berkeley, California. The Wildcat Fault is believed to be a strike-slip fault and a member of the Hayward Fault System, with over 10 km of displacement. So far, three boreholes of ∼ 150m deep have been core-drilled and borehole geophysical logs were conducted. The rocks are extensively sheared and fractured; gouges were observed at several depths and a thick cataclasitic zone was also observed. While confirming some earlier, published conclusions from shallow observations about Wildcat, some unexpected findings were encountered. Preliminary analysis indicates that Wildcat near the field site consists of multiple faults. The hydraulic test data suggest the dual properties of the hydrologic structure of the fault zone. A fourth borehole is planned to penetrate the main fault believed to lie in-between the holes. The main philosophy behind our approach for the hydrologic characterization of such a complex fractured system is to let the system take its own average and monitor a long term behavior instead of collecting a multitude of data at small length and time scales, or at a discrete fracture scale and to “up-scale,” which is extremely tenuous.
Study Area
| Publication type | Conference Paper |
|---|---|
| Publication Subtype | Conference Paper |
| Title | Development of characterization technology for fault zone hydrology |
| DOI | 10.1115/ICEM2010-40121 |
| Year Published | 2010 |
| Language | English |
| Publisher | American Society of Mechanical Engineers |
| Description | ICEM2010-40121, 7 p. |
| Larger Work Type | Book |
| Larger Work Subtype | Conference publication |
| Larger Work Title | Conference proceedings: International Conference on Environmental Remediation and Radioactive Waste Management |
| First page | 297 |
| Last page | 303 |
| Conference Title | 13th International Conference on Environmental Remediation and Radioactive Waste Management |
| Conference Location | Tsukuba, Japan |
| Conference Date | October 3-7, 2010 |
| Country | United States |
| State | California |
| Other Geospatial | Berkeley Hills, Wildcat Fault |
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