Earthquake Information
Fault Name Index
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Arroyo Parida Fault System
TYPE OF FAULTING: left-lateral with varied vertical slip
LENGTH: about 70 km
NEARBY COMMUNITIES: Santa Barbara, Goleta
MOST RECENT RUPTURE: 30,000 years ago
SLIP RATE: about 0.37 mm/yr (?)
INTERVAL BETWEEN MAJOR RUPTURES: 8000 years (?)
PROBABLE MAGNITUDES: MW6.5 - 7.3
OTHER NOTES: The Mission Ridge, Arroyo Parida, and Santa Ana faults make up an essentially continuous fault system running west to east from Goleta to Ojai, on the southern flank of the Santa Ynez Mountains. It has most likely ruptured in Holocene times, though the youngest dated surface rupture is roughly 30,000 years old. Prior to that, the fault ruptured about 38,000 years before present. Between these two rupture times there is about 3 meters of offset. Between the last measured rupture and the present, there has been about 11 meters of offset, so an average time between quakes of about 8,000 years, with an average slip of about 3 meters per major quake, seems quite possible.
This fault is featured on the following map:
Northwest Fault Map
