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.
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 |
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