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[3] viXra:2110.0110 [pdf] submitted on 2021-10-19 11:34:46
Authors: Abdelmajid Ben Hadj Salem, Jean Commiot
Comments: 216 Pages. In French. Comments welcome.
This monograph presents a course of mathematical cartography for engineers including essentially the following elements:
- the definitions of characteristic terms,
- the types of plane cartographic representations or "projections",
- some known examples,
- and a set of problems and exercises for the reader.
Category: Geophysics
[2] viXra:2110.0042 [pdf] replaced on 2023-04-14 11:23:12
Authors: Harry K. Hahn
Comments: 27 pages, 132 images, 5 diagrams, 1 table
This is a summary of the geophysical evidence for the Ø1270x950 km Permian-Triassic (PT)-Impact-Crater which I have discovered and described in my hypothesis Part 1-6.A topographic map and a satellite image of the Arctic Ocean area, Alaska and Siberia provided the first indication for the PT-Impact Crater and —impact event. The similarities of structures visible on the topographic map to the structures calculated by a computer-simulation of a shallow (oblique) impact with an impact angle of 5°, provide strong evidence for the existence of the Ø1270x950 km PT-Impact-Crater on the Arctic-Ocean-floor. A probability-assessment indicates a Probability >99,99997% for the existence of the PT-Crater!!Especially the elliptical deep-sea-basin in the Arctic Ocean, the bow-shaped Brooks-Range in Alaska and the northern-edge of the Central-Siberian-Plateau (Siberian Traps), which has the same bow-wave-structure like the calculated structure, are strong indicators that the PT-Impact Crater was caused by a shallow impact of an asteroid or comet.Further strong indication for the PT-Impact-Crater comes from a gravity-anomaly map and from a magnetic-anomaly map of the Arctic Ocean area and Alaska. The gravity anomaly map clearly shows sections of the elliptical crater-wall of the PT-Impact Crater (positive anomalies). The Brooks-Range in Alaska, which originally was part of the elliptical crater-wall-structure, is also indicated by a positive anomaly on the map. This section drifted away from the PT-Crater, caused by forces of the massive amounts of ejecta-material that was ejected from the crater, which probably was in the range of 100.000.000 to 200.000.000 km^3 of ejecta-material !The magnetic anomaly map of the Arctic Ocean area shows a triangular-shaped positive anomaly (red), which originates from the crater center. This indicates ejecta that was coming from an iron-rich impactor.The big distance between the elliptical impact basin and the described bow-wave-shaped structure in Siberia, which originally was located directly at the front-end of the PT-Crater, is the result of a divergent tectonic motion and expansion tectonics process that was triggered by the shallow PT-Impact. The leading edges (front-edges) of the two gigantic ejecta wings which were caused by the PT-Impact, cut through Earth’s crust and large amounts of impactor material (e.g. iron) and ejecta material descended into Earth’s mantle and caused the Pacific-LLSVP and the African-LLSVP. All volcanos of the Pacific Fire Ring and volcanism on Earth can be explained solely by the PT-Impact !
Category: Geophysics
[1] viXra:2110.0038 [pdf] submitted on 2021-10-08 06:21:48
Authors: Abdelmajid Ben Hadj Salem, Chedly Fezzani
Comments: 93 Pages. In French.
In this booklet, we give elements of the theory of Errors and notions of the Least Squares method for technicians working in the field of topography, geodesy and geomatics.
Category: Geophysics
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