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Geologic map of Morrill County, Nebraska Geologic map of Morrill County, Nebraska
No abstract available.
Maps of upper Mississippi embayment Paleozoic and Precambrian rocks Maps of upper Mississippi embayment Paleozoic and Precambrian rocks
The Mississippi Embayment regional seismic hazard (Fuller, 1912; Nuttli, 1973, 1982, 1983), associated with the New Madrid seismic zone (NMSZ) is attributed to displacement on seismogenic structures primarily within the failed Reelfoot rift (Burke and Dewey, 1973; Ervin and McGinnis, 1975; Hildenbrand, 1977; Johnston and Shedlock, 1992). Hildenbrand and others (1977) and Hildenbrand...
Maps showing gas-hydrate distribution off the east coast of the United States Maps showing gas-hydrate distribution off the east coast of the United States
These maps present the inferred distribution of natural-gas hydrate within the sediments of the eastern United States continental margin (Exclusive Economic Zone) in the offshore region from Georgia to New Jersey (fig. 1). The maps, which were created on the basis of seismic interpretations, represent the first attempt to map volume estimates for gas hydrate. Gas hydrate forms a large...
Geologic map and structure sections of the Clear Lake Volcanics, Northern California Geologic map and structure sections of the Clear Lake Volcanics, Northern California
The Clear Lake Volcanics are located in the California Coast Ranges about 150 km north of San Francisco. This Quaternary volcanic field has erupted intermittently since 2.1 million years ago. This volcanic field is considered a high-threat volcanic system (Ewert and others, 2005) The adjacent Geysers geothermal field, largest power-producing geothermal field in the world, is powered by...
Geologic map of Newberry Volcano, Deschutes, Klamath, and Lake counties, Oregon Geologic map of Newberry Volcano, Deschutes, Klamath, and Lake counties, Oregon
Newberry volcano, one of the largest Quaternary volcanoes in the conterminous United States, is a broad shieldlike landform with a summit caldera 7 km across. It comprises the products of thousands of eruptions, at least 25 of which occurred during the last 10,000 years (Holocene Epoch). Eruptions have occurred as recently as 1,300 years ago, but isotopic ages indicate that the volcano...
Geologic map of the Mount Adams volcanic field, Cascade Range of southern Washington Geologic map of the Mount Adams volcanic field, Cascade Range of southern Washington
One of the dominating peaks of the Pacific Northwest, Mount Adams, stands astride the Cascade crest, towering 3 km above the surrounding valleys. The icecapped 3742-m (12,276') stratovolcano has for centuries been called Pah-to by the region's indigenous people, who hold the mountain sacred as a symbol of continuity and a source of prosperity and inspiration. Comparable reverence helped...