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The Mendocino Fracture Zone is a fracture zone and transform boundary over 4000 km (2500 miles) long, starting off the coast of Cape Mendocino in far northern California. It runs westward from a triple junction with the San Andreas Fault and the Cascadia subduction zone to the southern end of the Gorda Ridge .
The Mendocino Fracture Zone extends for over 4,000 km off the coast of California and separates the Pacific Plate and Gorda Plate. The bathymetric depths on the north side of the fracture zone are 800 to 1,200 m shallower than to the south, suggesting the seafloor north of the ridge to be younger.
The plates that host the fractures are Nazca, Pacific, Antarctic, Juan de Fuca and Cocos among others. Fracture zones being subducted under Southern and Central America are generally southwest-northeast oriented reflecting the relative motion of Cocos, Nazca and the Antarctic Plates.
Mendocino Triple Junction. Coordinates: 40°22′N 124°36′W. The Mendocino Triple Junction is located at the eastern end of the Mendocino Fracture Zone where it approaches Cape Mendocino. The Mendocino Triple Junction (MTJ) is the point where the Gorda plate, the North American plate, and the Pacific plate meet, in the Pacific Ocean near ...
The Mendocino Fracture Zone marks the transform boundary between the Gorda and Pacific plates. [5] This tectonic boundary has been the cause of many earthquakes in the region, including the megathrust 1700 Cascadia earthquake, and the 1992 Cape Mendocino earthquakes, the latter of which measured 7.2. [6]
The 1992 Cape Mendocino earthquakes (or 1992 Petrolia earthquakes) occurred along the Lost Coast of Northern California on April 25 and 26. The three largest events were the M7.2 thrust mainshock that struck near the unincorporated community of Petrolia midday on April 25 and two primary strike-slip aftershocks measuring 6.5 and 6.6 that followed early the next morning.
The Middle America Trench is a major subduction zone, an oceanic trench in the eastern Pacific Ocean off the southwestern coast of Middle America, stretching from central Mexico to Costa Rica. The trench is 1,700 miles (2,750 km) long and is 21,880 feet (6,669 m) at its deepest point. The trench is the boundary between the Rivera, Cocos, and ...
Santa Ynez Fault. Serra Fault. Shoreline Fault. Sierra Madre Fault Zone. Sierra Nevada Fault. Sierra Nevada–Great Valley Block. Silver Creek Fault. Smartville Block.