Digital aeromagnetic datasets for the conterminous United States and Hawaii; a companion to the North American magnetic anomaly map

2002 ◽  
Author(s):  
Keyword(s):  
United States ◽  
Magnetic Anomaly ◽  
North American ◽  
The North ◽  
Anomaly Map

U.S. National Magnetic Anomaly Survey Specifications Workshop Report

Geophysics ◽  
1979 ◽  
Vol 44 (5) ◽  
pp. 991-992
Author(s):  
William J. Hinze
Keyword(s):  
Magnetic Anomaly ◽  
North American ◽  
Executive Committee ◽  
Ad Hoc ◽  
Magnetic Data ◽  
Aeromagnetic Data ◽  
Workshop Report ◽  
The North ◽  
Anomaly Map ◽  
The U.S

The National Magnetic Anomaly Map (NMAM) Committee, which was formed as an ad hoc committee in 1975 by the SEG Executive Committee, has recommended a multistage program for improving the aeromagnetic data of the U.S. On behalf of the geoscience community, the committee and the U.S. Geological Survey are currently engaged in the preparation of a photo‐composite map of the U.S. derived from publicly available data plus regional magnetic data contributed from the private sector. This map is at present being compiled and is to be pulished by the U.S.G.S. at a scale of [Formula: see text]. Eventually, utilizing this map, the committee plans to assist in the preparation of a North American magnetic anomaly map to supplement the North American tectonic map and the proposed continental gravity anomaly map.

North American Gravity and Magnetic Anomaly Workshops

Geophysics ◽  
1981 ◽  
Vol 46 (11) ◽  
pp. 1611-1617
Author(s):  
W. J. Hinze ◽  
N. W. O’Hara ◽  
M. S. Reford ◽  
J. G. Tanner
Keyword(s):  
Gravity Anomaly ◽  
Magnetic Anomaly ◽  
North American ◽  
North American Continent ◽  
The North ◽  
Terrain Effects ◽  
Gravity And Magnetic ◽  
Anomaly Map ◽  
Map Series ◽  
Gravity And Magnetic Anomaly

The North American Gravity and Magnetic Anomaly Map Workshops, realizing the importance of regional gravity and magnetic anomalies to investigating the structure and composition of the earth, enthusiastically support the preparation of North American gravity and magnetic anomaly maps. Sufficient magnetic and gravity anomaly data are available over the North American continent, the Caribbean, and adjacent marine areas to produce geologically meaningful maps. These maps will be published within the decade at a scale of 1:5 million on the same map base being used by a variety of organizations to produce other geologic/geochemical/geophysical maps in cooperation with the Geological Society of America’s Centennial Map Series. The anomaly maps will be published in color with transparent overlays also available. The gravity anomaly map will be contoured at a 10 mgal interval using Bouguer anomalies onshore corrected wherever possible and necessary for terrain effects and free‐air anomalies offshore. Existing or soon to be completed magnetic and gravity anomaly maps of Canada, the U.S., and Mexico will provide the nuclei for preparing the North American maps. Programs for producing these maps in a timely manner are organized based upon a series of committees and the cooperation of agencies of the involved North American nations.

Limitations of the long‐wavelength components of the North American magnetic anomaly map

Geophysics ◽  
1990 ◽  
Vol 55 (12) ◽  
pp. 1577-1588 ◽  
Author(s):  
J. Arkani‐Hamed ◽  
W. J. Hinze
Keyword(s):  
Magnetic Anomaly ◽  
North American ◽  
Data Set ◽  
Long Wavelength ◽  
Related Data ◽  
The North ◽  
North American Data ◽  
Crustal Magnetization ◽  
Anomaly Map ◽  
Lateral Variations

The magnetic anomaly map of North America and its related data set provide the opportunity not only to view the obvious short‐wavelength anomalies (<300 km) in a continental context, but to isolate and analyze the longer wavelength anomalies. However, care must be used in analyzing the longer wavelengths because of the effects of noncrustal sources on these anomalies. Inversion of the anomalies into lateral variations of crustal magnetization suggests that the long‐wavelength anomalies (>2600 km) are strongly affected by core field components that have not been completely removed from the North American data set. Furthermore, the piecewise matching of the magnetic anomalies of adjacent survey areas in the map compilation has contaminated the intermediate wavelength anomalies (300–2600 km).

scholarly journals “The Future of Archaeology Is Antiracist”: Archaeology in the Time of Black Lives Matter

2021 ◽  
pp. 1-20
Author(s):  
Ayana Omilade Flewellen ◽  
Justin P. Dunnavant ◽  
Alicia Odewale ◽  
Alexandra Jones ◽  
Tsione Wolde-Michael ◽  
...  
Keyword(s):  
United States ◽  
North American ◽  
The United States ◽  
Heritage Preservation ◽  
Social Unrest ◽  
Black Lives Matter ◽  
The North ◽  
Road Map ◽  
The Social ◽  
The Future

This forum builds on the discussion stimulated during an online salon in which the authors participated on June 25, 2020, entitled “Archaeology in the Time of Black Lives Matter,” and which was cosponsored by the Society of Black Archaeologists (SBA), the North American Theoretical Archaeology Group (TAG), and the Columbia Center for Archaeology. The online salon reflected on the social unrest that gripped the United States in the spring of 2020, gauged the history and conditions leading up to it, and considered its rippling throughout the disciplines of archaeology and heritage preservation. Within the forum, the authors go beyond reporting the generative conversation that took place in June by presenting a road map for an antiracist archaeology in which antiblackness is dismantled.

The North American Species in Group VII of Ips De Geer (Coleoptera: Scolytidae)

1965 ◽  
Vol 97 (2) ◽  
pp. 193-198 ◽  
Author(s):  
G. R. Hopping
Keyword(s):  
United States ◽  
New Species ◽  
North American ◽  
North American Species ◽  
The North ◽  
Northern United States

AbstractGroup VII of North American Ips contains I. thomasi, new species, I. borealis Swaine and I. swainei R. Hopping. They are less than 4.0 mm. long and females have the front of the head or at least the vertex smooth and shining, impunctate, or with very fine sparse punctures; males are more coarsely granulate-punctate on the frons. The species are described and a key is given. All breed in Picea in Canada and northern United States.

A SYNOPSIS OF THE NORTH AMERICAN SPECIES OF SYNDIPNUS (HYMEN., ICHNEUMONIDAE)

1940 ◽  
Vol 72 (7) ◽  
pp. 135-145 ◽  
Author(s):  
G. Stuart Walley
Keyword(s):  
United States ◽  
North American ◽  
The United States ◽  
North American Species ◽  
National Museum ◽  
United States National Museum ◽  
The North

As noted below the two North American species described in Syndipnus by workers appear to belong in other genrra. In Europe the gunus is represented by nearly a score of species and has been reviewed in recent years by two writers (1, 2). North American collections contain very few representatives of the genus; after combining the material in the National Collection with that from the United States National Museum, the latter kindly loaned to me by Mr. R. A. Cushman, only thirty-seven specimens are available for study.

Sign in / Sign up

Export Citation Format

Share Document