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On the east, the Devils Mountain Fault connects with the south striking Darrington Fault (not shown) which runs to the OWL, and the Southern Whidbey Island Fault extends via the Rattlesnake Mountain Fault Zone (dashed line) to the OWL. South of the OWL a definite eastern boundary has not been found, with some indications it is indefinite.
This also initiated the oblique left-lateral Devils Mountain fault, including the section now known as the Leech River fault, and its right-lateral extension, the Darrington fault, that strikes southward from the town of Darrington to converge with the right-lateral strike-slip Straight Creek Fault at the OWL (see map). [20]
Location of SCF and related faults in the North Cascades.. The Straight Creek Fault (SCF) is the principal north-south strike-slip fault in the state of Washington, with a minimum of 90 kilometers (54 miles) of right-lateral offset, and a major geological structure in the North Cascade mountains, where it separates the pre-Cenozoic igneous and metamorphic rocks of the North Cascades on the ...
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Location of the Olympic-Wallowa Lineament Is the OWL an optical illusion?. The Olympic–Wallowa lineament (OWL) is a series of geologic structures oriented from northwest to southeast for 650 km (400 mi) across Washington and northeast Oregon in the United States, passing through the Seattle area and including notable features east of the Cascade Range such as the Yakima Fold Belt and Wallowa ...
A newly found fault line with a rare slanted angle shows why an earthquake rattled New York City in April harder than its epicenter in New Jersey — and may be a bigger seismic activity threat ...
A fault off the Pacific coast could devastate Washington, Oregon and Northern California with a major earthquake and tsunami. Researchers mapped it comprehensively for the first time.
The Swauk, Roslyn, Chumstick, and Manastash Formations (SW and MA) are on the east side of the Cascade Range and south of Mount Stuart (in the vicinity of Roslyn, Washington); the offset between these and the Chuckanut/Huntingdon is evidence of large-scale (about 110 km [3]) strike-slip motion on the Straight Creek Fault, starting at 48 Ma.