Rupture mechanics on the Hayward Fault
Article first published online: 3 JUN 2011
©1969. American Geophysical Union. All Rights Reserved.
Eos, Transactions American Geophysical Union
Volume 50, Issue 5, page 382, May 1969
How to Cite
1969), Rupture mechanics on the Hayward Fault, Eos Trans. AGU, 50(5), 382–382, doi:10.1029/EO050i005p00382-01., and (
- Issue published online: 3 JUN 2011
- Article first published online: 3 JUN 2011
- Cited By
The Hayward fault is a right-lateral, strikeslip fracture in the crust to the east of San Francisco Bay. Its earthquake history shows activity for the last 130 years; in 1836 and 1868, large damaging earthquakes were accompanied by surface rupture along the fault. At Berkeley, an intensive special study of the mechanics of the fault is possible. A mining adit exposes the gouge clay of the shear zone. Differential displacement of a culvert across the fault, measured continuously since 1965, shows a slippage rate of 2.5 mm per year over all with a definite pattern of seasonal fluctuations. The monitoring of small local earthquakes shows an average of 3 to 5 per year (2<M<3) within 10 km of Berkeley; focal depths are quite shallow with a few as great as 10 km.