| viXra.org > Geophysics > 2012 |
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| viXra.org > Geophysics > 2012 |
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[8] viXra:2012.0210 [pdf] replaced on 2022-03-01 13:59:05
Authors: Harry K. Hahn
Comments: 31 pages, 135 figures, 1 table
There is evidence for an enormous elliptical Impact Crater with the dimensions of 1270x950 km on the ocean floor of the Arctic Ocean. This elliptical impact crater and the dynamic effects of the ejected material have formed the deep sea basin area below -3000 m in the Arctic Ocean and triggered an expansion tectonics process. This impact crater seems to be responsible for the Permian-Triassic boundary ~253 million years ago, which has caused the biggest mass extinction in Earth’s history. The Permian-Triassic (PT)-Impact Crater was formed by an oblique impact. This means that the impactor, an asteroid or comet in the diameter range of probably 60 to 200 km, collided with our planet at a very shallow angle, of probably less than 8°, with a relative low impact velocity of around 8 km/s and a resulting impact pressure of probably <5 GPa for most (> 90%) of the excavated and ejected material, which makes it difficult to provide mineralogical evidence (shock metamorphism) to proof this global impact scenario. A computer simulation shows a close correlation between the topography of the assumed P/T-Impact Crater and the topography of a simulated elliptical impact crater that was created under similar conditions. The PT-Impact Event caused a gigantic butter-fly-shaped ejecta blanket which covered the majority of the northern- and southern hemisphere. Within the boundaries of this ejecta blanket many large secondary impact craters were formed by the ejecta, with crater diameters of up to 450 km. Please also read Part 2 & 3 of my hypothesis, where I describe many of the secondary impact-craters and -structures in more detail, which were caused by the PT-Impact Event. I have found mineralogical proof for six real PT-secondary-craters. In Europe up to 20 large secondary craters were caused. In India a secondary impactor produced a 450x380km elliptical crater which formed the Bay of Bengal. Similar large secondary craters were caused along the NE-coast and on the NW-coast of Australia and in South-America. And in Africa four extensive impact crater chains were caused. The impulse of the PT-impact and the impulses of the PT-ejecta and -secondary-crater-impacts, caused a global fracture pattern on Earth’s crust that was the trigger for a global expansion-tectonic-process which is still going on today. The ocean-floor age map and the ocean-floor topographic map provide evidence for this expansion tectonic process.
Category: Geophysics
[7] viXra:2012.0206 [pdf] submitted on 2020-12-28 07:06:06
Authors: Abdelmajid Ben Hadj Salem
Comments: 14 Pages. In French.
In this paper, we give the different definition of heights and the corrected terms to take in consideration. An example is presented on how to correct a line of the spirit levelling by introducing gravity observations.
Category: Geophysics
[6] viXra:2012.0148 [pdf] submitted on 2020-12-20 06:31:20
Authors: Abdelmajid Ben Hadj Salem
Comments: 5 Pages. In French.
The purpose of this note is to give proposals for the methodology for using the new coordinates obtained following the completion of the calculations of the compensation for the new Tunisian terrestrial geodetic network called the Tunisian Terrestrial Primordial Geodetic Network (RGPTT).
Category: Geophysics
[5] viXra:2012.0060 [pdf] submitted on 2020-12-09 10:20:53
Authors: Abdelmajid Ben Hadj Salem
Comments: 42 Pages. In French.
This paper concerns the study of systematic errors in the combination of Doppler data and classical terrestrial observations in the adjustment of geodetic networks. This study is taken from the thesis presented in October 1986 for obtaining the Civil Geographic Engineer diploma from the National School of Geographic Sciences (ENSG / IGN France).
Category: Geophysics
[4] viXra:2012.0055 [pdf] submitted on 2020-12-08 13:57:44
Authors: Abdelmajid Ben Hadj Salem
Comments: 8 Pages. In French.
In this note, we present the technical procedures for the execution of co-owned subdivisions in Tunisia. We give all the details concerning the work in the office as well as those in the field.
Category: Geophysics
[3] viXra:2012.0049 [pdf] submitted on 2020-12-08 08:07:44
Authors: Ana B. Ruescas, Gonzalo Mateo-García, Gustau Camps-Valls, Martin Hieronymi
Comments: 8 Pages.
Water quality parameters are derived applying several machine learning regression methods on the Case2eXtreme dataset (C2X). The used data are based on Hydrolight in-water radiative transfer simulations at Sentinel-3 OLCI wavebands, and the application is done exclusively for absorbing waters with high concentrations of coloured dissolved organic matter (CDOM). The regression approaches are: regularized linear, random forest, Kernel ridge, Gaussian process and support vector regressors. The validation is made with and an independent simulation dataset. A comparison with the OLCI Neural Network Swarm (ONSS) is made as well. The best approached is applied to a sample scene and compared with the standard OLCI product delivered by EUMETSAT/ESA.
Category: Geophysics
[2] viXra:2012.0010 [pdf] submitted on 2020-12-03 05:33:12
Authors: Abdelmajid Ben Hadj Salem
Comments: 4 Pages. In French.
In this paper, we give the formula of the curvature of the curve image, in the case of a conformal map projection, of geodesic curves of the ellipsoid as the model of the Earth. As an example, we consider the UTM map projection and we give the expression of the formula of the curvature.
Category: Geophysics
[1] viXra:2012.0009 [pdf] submitted on 2020-12-03 09:23:13
Authors: Abdelmajid Ben Hadj Salem
Comments: 4 Pages. In French.
The purpose of this note is to give the different characteristics of ellipsoids of revolution used as models of the Earth for the definition of geodetic systems in countries or on a global scale.
Category: Geophysics
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