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Las Vegas Valley is a basin located in the U.S. state of Nevada. The valley in the northwest section is a northwest-by-southeast〔Nevada Atlas & Gazetteer, DeLorme, c. 2010, p. 70, p. 66-67.〕 trending area, and trending parallel to Las Vegas Wash, lies at the northeast of the Spring Mountains massif. U.S. Route 95 leaves Las Vegas' northwest and goes northwesterly through the northwest valley section, with Las Vegas Wash about 〔Nevada Atlas & Gazetteer, p. 70.〕 northeast. U.S. 95 lies on the southwest perimeter of the valley bottomlands, and small alluvial fan areas from the northeast Spring Mountains border southwest. A "distorted surface",〔Nevada Atlas & Gazetteer, p. 70, p. 66-67.〕 a playa-like region, occurs at the farthest northwest area, for about , starting from Nevada Route 157. At Nevada Route 156, northwest, the distorted surface, bottom land turns north, a area in length and about wide. It lies at the south drainage section of the Three Lakes Valley, where a water divide separates Dog Bone Lake in the valley's center from the southwest washes that drain into the Las Vegas Valley (upland Las Vegas Wash). The Corn Creek Dunes lie about southwest of Route 156's intersection with U.S. 95, and they are slightly northeast of Las Vegas Wash. ==Las Vegas Valley== The Las Vegas Valley is an area about . All perimeters, except the northwest, are foothills or mountain ranges, with all highway routes entering the foothills; this includes the Interstate 15 to the southwest, as it climbs to Jean Pass (north), before traversing Ivanpah Valley. Only the U.S. Route 95 northwest follows an actual valley. The northwest section, thus describes the entire landform as a central, and large valley with an attached feeder valley northwest, and in this case the northwest source, and actual course of the Las Vegas Wash. The valley is a ''fault-bounded structural and hydrologic basin'' made of alluvial-fan deposits. There are several aquifers contained within the valley including the Las Vegas Aquifer. These heavily depleted water sources exist at about in depth.〔 As of 1986, estimate show that the valley floor in Downtown Las Vegas has subsided by about and about along The Strip as a result of pumping from these aquifers. The valley is an active earthquake zone crossed by multiple fault and thrust lines. These include the long Frenchman Mountain Fault capable of a magnitude 7 event, Whitney Mesa Fault, Cashman Fault, Valley View Fault, Decatur Fault, Eglington Fault and the West Charleston Fault. 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「Las Vegas Valley (landform)」の詳細全文を読む スポンサード リンク
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