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Keweenaw Fault : ウィキペディア英語版 | Keweenaw Fault
The Keweenaw Fault is a reverse fault that bisects the Keweenaw Peninsula of the Upper Peninsula of Michigan. The fault is the boundary between the Midcontinent Rift System and adjacent Precambrian terrain. The peninsula, itself, is the southeastern side of a large syncline beneath Lake Superior. The northwestern side forms Isle Royale. The fault is more than long and traces a northwesterly path. The fault is most likely younger than the Jacobsville Formation and the Devonian Period. An seismic event in 1906 claimed to be an earthquake has been attributed to a rock burst, as the area has been significantly mined. ==The Natural Wall== One significant feature along the Keweenaw Fault is known as the ''Natural Wall''. The ''Wall'' is a near-vertical slope of sandstone at a maximum inclination of 85°.
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Keweenaw Fault」の詳細全文を読む
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