Dynamics of Comets and Asteroids and Their Role in Earth by Andrew Glikson (auth.), Shin Yabushita, Jacques Henrard

By Andrew Glikson (auth.), Shin Yabushita, Jacques Henrard (eds.)

The final decade of this century has visible a renewed curiosity within the dynamics and physics of the small our bodies of the sunlight approach, Asteroids, Comets and Meteors. New observational evidences similar to the invention of the Edgeworth-Kuiper belt, subtle numerical instruments similar to the symplectic integrators, analytical instruments reminiscent of semi-numerical perturbation algorithms and typically a greater realizing of the dynamics of Hamiltonian platforms, a lot of these components have converged to make attainable and worthy the examine, over long time spans, of those "minor" gadgets. additionally the general public, the media or even a few political assell}blies became conscious that those "minor" items of our planetary environnement may perhaps turn into lethal guns. it sounds as if they did have a task in Earth background and a task extra ominous than "predicting" defeat (or victory, why not?) to batches of credulous rulers. Remembering what could have occurred to the dinosaurs yet maintaining all of the discretion essential to stay away from developing irrational scares, it could actually no longer be unwise or inappropriate to enhance our wisdom of the physics and dynamics of those gadgets and to review specifically their interactions with our planet.

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By Andrew Glikson (auth.), Shin Yabushita, Jacques Henrard (eds.)

The final decade of this century has visible a renewed curiosity within the dynamics and physics of the small our bodies of the sunlight approach, Asteroids, Comets and Meteors. New observational evidences similar to the invention of the Edgeworth-Kuiper belt, subtle numerical instruments similar to the symplectic integrators, analytical instruments reminiscent of semi-numerical perturbation algorithms and typically a greater realizing of the dynamics of Hamiltonian platforms, a lot of these components have converged to make attainable and worthy the examine, over long time spans, of those "minor" gadgets. additionally the general public, the media or even a few political assell}blies became conscious that those "minor" items of our planetary environnement may perhaps turn into lethal guns. it sounds as if they did have a task in Earth background and a task extra ominous than "predicting" defeat (or victory, why not?) to batches of credulous rulers. Remembering what could have occurred to the dinosaurs yet maintaining all of the discretion essential to stay away from developing irrational scares, it could actually no longer be unwise or inappropriate to enhance our wisdom of the physics and dynamics of those gadgets and to review specifically their interactions with our planet.

Show description

Read or Download Dynamics of Comets and Asteroids and Their Role in Earth History: Proceedings of a Workshop held at the Dynic Astropark ‘Ten-Kyu-Kan’, August 14–18, 1997 PDF

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Extra info for Dynamics of Comets and Asteroids and Their Role in Earth History: Proceedings of a Workshop held at the Dynic Astropark ‘Ten-Kyu-Kan’, August 14–18, 1997

Example text

In 1996-1997, one of the authors (FP) conducted further work on SIS within the framework of the re-mapping of the Earaheedy Basin and the Nabberu 1:250,000 sheet by the Geological Survey of Western Australia (GSWA). A geological map of the Nabberu 1:100,000 map sheet within which SIS is contained, with accompanying Explanatory Notes, is to be published by the GSWA. The second author (AYG) has processed Landsat-5 Thematic Mapper image data and airborne magnetic and Bouguer anomaly image data for the SIS.

This will therefore be removed from the dataset. As to the peaks in the extinction rate of marine fauna, data provided by Rampino & Caldeira (1992) will be adopted. These are given in Table I together with the craters such that their ages agree with the extinction peaks. Recently identified 34 S. YABUSHffA TABLE I Mass extinction peaks and probably related crater ages. Data taken from Rampino & Caldeira (1992) and from Grieve (1993). 6 No. 2 95 28 25 180 24 25 39 22 100 Popigai Chesapeake Bay* Mistastin Kamensk Chicxulub Boltysh Steen River Carswell Gosses Bluff Morokweng* 186 ± 8 212±2 219 ± 32 220± 10 249±5 23 100 40 80 40 Rochechouart Manicouagan Saint Martin Puchezh-Katunki Araguainha Dome • These recently identified craters are not included in the present statistical testing for the sake of consistency with earlier data, but a discussion of them will be given in the final section.

H. Watt (GSWA). EUGENE SHOEMAKER 29 (TMI) map of the Nabberu 1:250,000 sheet (AGSO dataset; Liu, 1997 and Mackay and Franklin, 1996). Two circular patterns are shown- an outer 28 km-wide magnetic ring is characterised by low TMI, whereas an inner ring is outlined by high TMI along the eastern and south eastern rim, probably reflecting the steeply upturned collar. Recent geological mapping reveals km-scale radial fractures in the Archaean basement 5 to 10 km southwest of the structure, and in the Earaheedy Group north of the structure (Fig.

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