Preliminary map showing recently active breaks along the Maacama Fault zone between Hopland and Laytonville, Mendocino County, California
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Abstract
The southernmost 15 km of this map is a product of a study that began in 1975 as part of a study of recency of faulting in coastal California (Ziony and others, 1974; Buchanan-Banks and others, 1978; Pampeyan , 1979). In February 1975, after being shown evidence of recent faulting in the vicinity of Ukiah by E. C. Winterhalder, Principal Engineering Geologist for Harding - Lawson Associates, Pampeyan extended the study area northward to the vicinity of Willits . After the Willits earthquake of November 22, 1977 (Simon and others, 1978; Warren and others, 1979), field investigations in the epicentral area revealed a series of distressed pavements, curbs, and sidewalks all showing right-lateral offset (Harsh and others, 1978; 1981). These features traverse the city of Willits and define a line coincident with a photolineament extending southeastward from Willits. Subsequently, additional sites of distressed pavements discovered both east and north of Ukiah alone; other lineaments of the photogeologic study verified the existence of tectonic creep in the Maacama fault zone.
Suggested Citation
Pampeyan, E., Harsh, P., Coakley, J., 1981, Preliminary map showing recently active breaks along the Maacama Fault zone between Hopland and Laytonville, Mendocino County, California: U.S. Geological Survey Miscellaneous Field Studies Map 1217, 3 Sheets: 58.01 x 42.00 inches or smaller, https://doi.org/10.3133/mf1217.
Study Area
| Publication type | Report |
|---|---|
| Publication Subtype | USGS Numbered Series |
| Title | Preliminary map showing recently active breaks along the Maacama Fault zone between Hopland and Laytonville, Mendocino County, California |
| Series title | Miscellaneous Field Studies Map |
| Series number | 1217 |
| DOI | 10.3133/mf1217 |
| Year Published | 1981 |
| Language | English |
| Publisher | U.S. Geological Survey |
| Description | 3 Sheets: 58.01 x 42.00 inches or smaller |
| Country | United States |
| State | California |
| County | Mendcino County |
| Scale | 24000 |