EXTENDED TERRAIN CORRECTION TABLES FOR GRAVITY REDUCTIONS

Geophysics ◽  
1972 ◽  
Vol 37 (2) ◽  
pp. 377-379
Author(s):  
Jesse K. Douglas ◽  
Sidney R. Prahl
Keyword(s):  
Computer Program ◽  
Rocky Mountain ◽  
Terrain Correction ◽  
Western Montana ◽  
Inclined Plane ◽  
Plane Model ◽  
Mountain Area ◽  
Terrain Corrections

This note extends the gravity terrain corrections for elevation differences beyond the tables originally published by Hammer (1939). Experience in the Rocky Mountain area has demonstrated to us the need for such an extension. The frustration encountered by the authors led to a computer program to calculate the terrain correction tables presented in this article. The mountain topography in western Montana is typical of an area not sufficiently regular to allow use of the less tedious inclined‐plane model presented by Sandberg (1958). The inclined‐plane and the cylinder models are designed for calculating the effects of local terrain and do not include a correctional factor for earth curvature. Large regional surveys require the Hayford‐ Bowie terrain correction zones. However, local surveys can be easily incorporated into these larger studies by Hammer to Hayford‐Bowie transition tables (Sandberg, 1959),

scholarly journals Necessity of Terrain Correction in Magnetotelluric Data Recorded from Garhwal Himalayan Region, India

Geosciences ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 482
Author(s):  
Dharmendra Kumar ◽  
Arun Singh ◽  
Mohammad Israil
Keyword(s):  
Real Data ◽  
Terrain Correction ◽  
Himalayan Region ◽  
General Character ◽  
Period Range ◽  
Magnetotelluric Data ◽  
Heterogeneous Models ◽  
Corrected Data ◽  
Terrain Corrections ◽  
And Inversion

The magnetotelluric (MT) method is one of the useful geophysical techniques to investigate deep crustal structures. However, in hilly terrains, e.g., the Garhwal Himalayan region, due to the highly undulating topography, MT responses are distorted. Such responses, if not corrected, may lead to the incorrect interpretation of geoelectric structures. In the present paper, we implemented terrain corrections in MT data recorded from the Garhwal Himalayan Corridor (GHC). We used AP3DMT, a 3D MT data modeling and inversion code written in the MATLAB environment. Terrain corrections in the MT impedance responses for 39 sites along the Roorkee–Gangotri profile in the period range of 0.01 s to 1000 s were first estimated using a synthetic model by recording the topography and locations of MT sites. Based on this study, we established the general character of the terrain and established where terrain corrections were necessary. The distortion introduced by topography was computed for each site using homogenous and heterogeneous models with actual topographic variations. Period-dependent, galvanic and inductive distortions were observed at different sites. We further applied terrain corrections to the real data recorded from the GHC. The corrected data were inverted, and the inverted model was compared with the corresponding inverted model obtained with uncorrected data. The modification in electrical resistivity features in the model obtained from the terrain-corrected response suggests the necessity of terrain correction in MT data recorded from the Himalayan region.

New Partnership Between Universities and State Departments of Transportation in the Rocky Mountain Area: The TEL8 System

1997 ◽  
Vol 1580 (1) ◽  
pp. 11-15
Author(s):  
Eugene M. Wilson ◽  
Khaled Ksaibati
Keyword(s):  
Rocky Mountain ◽  
Lessons Learned ◽  
Graduate Course ◽  
Open Communication ◽  
Mountain Area ◽  
Course Work ◽  
Regional Universities ◽  
The Many ◽  
Satellite Transmission ◽  
Departments Of Transportation

In 1995, the Mountain-Plains Consortium in the Rocky Mountain area initiated TEL8. TEL8 is a satellite-based telecommunications system serving 10 sites in FHWA’s Region 8. Each site consists of in-room audio and video equipment that receives and transmits live sound and picture, coding/decoding compression equipment, and a satellite transmission system. Each site is capable of sending and receiving signals from other sites in several modes of conferencing ranging from broadcast to multipoint two-way conferencing. The goals of TEL8, its development, and lessons learned are presented along with cost data for this cutting-edge technology. The many applications, including formal graduate course work, informally scheduled learning opportunities, and open communication forums, are also discussed. The system provides a network for interaction among the six departments of transportation and four regional universities. A user assessment of this form of distance learning is compared with more traditional forms using results of several client-based surveys.

Soil detachment capacity of shallow overland flow in Earth-Rocky Mountain Area of Southwest China

Geoderma ◽  
2020 ◽  
Vol 361 ◽  
pp. 114021
Author(s):  
Xiaoli Zhu ◽  
Suhua Fu ◽  
Quanyuan Wu ◽  
Aijuan Wang
Keyword(s):  
Southwest China ◽  
Overland Flow ◽  
Rocky Mountain ◽  
Mountain Area

Contrasting water sources of evergreen and deciduous tree species in rocky mountain area of Beijing, China

CATENA ◽  
2017 ◽  
Vol 150 ◽  
pp. 108-115 ◽  
Author(s):  
Ziqiang Liu ◽  
Xinxiao Yu ◽  
Guodong Jia ◽  
Jianbo Jia ◽  
Yuanhai Lou ◽  
...  
Keyword(s):  
Tree Species ◽  
Rocky Mountain ◽  
Water Sources ◽  
Deciduous Tree ◽  
Mountain Area ◽  
Beijing China

scholarly journals The 19th Rocky Mountain Virology Association Meeting

Viruses ◽  
2020 ◽  
Vol 12 (1) ◽  
pp. 85
Author(s):  
Joel Rovnak ◽  
Laura A. St. Clair ◽  
Elena Lian ◽  
Carley McAlister ◽  
Rushika Perera ◽  
...  
Keyword(s):  
New York ◽  
Rocky Mountain ◽  
State University ◽  
Mountain Area ◽  
Colorado State University ◽  
Keynote Presentation ◽  
Virus Transcription ◽  
Depth Analysis ◽  
Protein Research ◽  
Areas Of Interest

This autumn, 95 scientists and students from the Rocky Mountain area, along with invited speakers from Colorado, California, Montana, Florida, Louisiana, New York, Maryland, and India, attended the 19th annual meeting of the Rocky Mountain Virology Association that was held at the Colorado State University Mountain Campus located in the Rocky Mountains. The two-day gathering featured 30 talks and 13 posters—all of which focused on specific areas of current virology and prion protein research. The keynote presentation reviewed new tools for microbial discovery and diagnostics. This timely discussion described the opportunities new investigators have to expand the field of microbiology into chronic and acute diseases, the pitfalls of sensitive molecular methods for pathogen discovery, and ways in which microbiology help us understand disruptions in the social fabric that pose pandemic threats at least as real as Ebola or influenza. Other areas of interest included host factors that influence virus replication, in-depth analysis of virus transcription and its effect on host gene expression, and multiple discussions of virus pathology, epidemiology as well as new avenues of diagnosis and treatment. The meeting was held at the peak of fall Aspen colors, surrounded by five mountains >11,000 ft (3.3 km), where the secluded campus provided the ideal setting for extended discussions, outdoor exercise and stargazing. On behalf of the Rocky Mountain Virology Association, this report summarizes 43 selected presentations.

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