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Friday, April 24, 2020 | History

3 edition of Impact cratering calculations found in the catalog.

Impact cratering calculations

T. J. Ahrens

Impact cratering calculations

annual performance report, 10/1/96-9/30/97, NASA/Goddard grant NAG5-4206

by T. J. Ahrens

  • 6 Want to read
  • 19 Currently reading

Published by National Aeronautics and Space Administration, National Technical Information Service, distributor in [Washington, DC, Springfield, Va .
Written in English

  • Impact damage.,
  • Cratering.,
  • Planetary surfaces.,
  • Collisions.,
  • Meteorites.,
  • Comets.,
  • Computation.

  • Edition Notes

    Statementprincipal investigator, Thomas J. Ahrens.
    Series[NASA contractor report] -- NASA-CR-204985., NASA contractor report -- NASA CR-204985.
    ContributionsUnited States. National Aeronautics and Space Administration.
    The Physical Object
    Pagination1 v.
    ID Numbers
    Open LibraryOL15487016M

    @article{osti_, title = {Computer simulation of nuclear weapons effects}, author = {Margolin, L.G. and Burton, D.E. and Crowley, W.P. and Trent, B.C.}, abstractNote = {Computer simulation programs have allowed us to model and understand the results of nuclear explosives tests underground and in the atmosphere. Most current research on modeling weapons effects has concentrated in two.   Over at Mars, the Mars Reconnaissance Orbiter has found fresh impact cratering that has excavated water ice just beneath the surface of Mars. To complement these stories, we have a couple of cratering activities to recommend for grades 5 - All of these activities meet standards in Earth and Space Science, and Mathematics.

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Impact cratering calculations by T. J. Ahrens Download PDF EPUB FB2

This is the book often referred to in the Lunar and Planetary Institute's handbook on cratering, Traces of a Catastrophe, which condenses the material from Melosh's book.

Impact Cratering looks at all aspects of cratering mechanics, ejecta deposits, modification, simple and complex craters, atmospheric interaction, and includes formulas, many Cited by: Understanding the Impact Cratering Process: a Simple Approach At some time in their life nearly every girl, boy (and adult) has thrown pebbles or cobbles into mud and watched nice round form.

The force of the impacts create circular structures with raised rimmed wall; spatters of mud and smaller circular secondary craters may be seen (Fig. Only following World War I did scientists recognize the similarity between impact craters and explosion craters, but, sadly, Gilbert did not live to see his impact hypothesis widely accepted.

The Cratering Process. Let’s consider how an impact at these high speeds produces a crater. these calculations indicate that a crater 1 kilometer in. This book Impact cratering calculations book the gold standard for describing basic impact cratering processes for scientists.

Highly useful as both a teaching tool and later references. Some of the information is beginning to show its age, but it is still 'required' reading for anyone interested in the science of impacts and the craters they form.5/5.

An impact crater is an approximately circular depression in the surface of a planet, moon, or other solid body in the Solar System or elsewhere, formed by the hypervelocity impact of a smaller body. In contrast to volcanic craters, which result from explosion or internal collapse, impact craters typically have raised rims and floors that are lower in elevation than the surrounding terrain.

Larger impact structures are shallow, they have overall flat interiors with several characteristic morphological elements, such as central peaks or rings. In addition to observations the cratering process is investigated by impact and explosion experiments and by Cited by: 4.

Shaping the Planets: Impact Cratering. Impact cratering is the excavation of a planet's surface when it is struck by a meteoroid. Impacts are instantaneous events.

They leave very characteristic features. What are craters. Craters are roughly circular, excavated holes made by impact events.

The circular shape is due to material flying out in. Jean-Pierre Williams, in Dynamic Mars, Abstract. Impact cratering is a pervasive geologic process that continually modifies the martian surface. Meters to tens-of-meters scale craters have been observed to form during the lifetimes of the Mars Global Surveyor and Mars Reconnaissance Orbiter missions providing Impact cratering calculations book observations of the present-day martian impact rate on a decadal timescale.

This major study of crater morphology examines the physics of impact cratering, the geologic processes associated with it, and its role in planetary evolution. Melosh outlines landmark events in the history of impact cratering and places modern developments in historical perspective.

Since important impact structures exist on our planet as well as on bodies in the solar system, this valuable 5/5(1). Based on the original science of. Robert Marcus, H. Jay Melosh Impact cratering calculations book Gareth Collins.

Sites of Impact - Meteorite craters around the world. It's a large coffee-table sized book (33 by 26 cm) with black-&-white photographs of the major impact craters on Earth: Barringer crater, Beaverhead, Gosses Bluff, Henbury, Roter Kamm, Tswaing, Upheaval dome, Wolfe Creek, etc Cited by: 1.

onstrated that impact cratering has been, and still is, a major process in the origin and evolution of all the solid bodies of the solar system, from Mercury to the moons of Neptune (for summaries and references, see Taylor,Chapter 3;Chapter 4).

The abundant craters on the surface ofFile Size: 2MB. Introduction. This is an application that allows you to determine the crater size, shape and other features, for both explosion and impact craters for terrestrial and solar-system cratering, and for a very wide range of conditions: from lab-sized to 's of kilometer basins.

There are now about identified impact craters on the Earth, and this number is growing, ever since the well known discovery of Meteor Crater in s. Currently, multi-interdisciplinary research studies of impact structures are getting conducted in fields like mineralogy, petrology, environmental geology, and marine biology.

The course objectives are to introduce basic principles of impact. Figure Impact ejecta of the Ries impact structure, Germany.

(a) Schematic cross - section across the Ries impact structure indicating the nature and location of various impactites.

Get this from a library. Impact cratering calculations: annual performance report, 10/1//30/97, NASA/Goddard grant NAG [T J Ahrens; United States. National Aeronautics and. On Earth, the diameter of complex impact craters is larger to about 2 to 4 km (Grieve, ); complex craters start to form on the Moon for diameters around km (e.g., Howard, ).

The central uplift is composed of rocks that originated below the crater floor. Attention is given to the application of high explosion cratering data to planetary problems, cratering mechanisms observed in laboratory-scale high-explosive experiments, nuclear cratering experiments, complex craters in alluvium, terrestrial impact structures, the Ries impact crater, buried impact craters in the Williston basin and the.

Impact melt is, thus, generated and will be, as a consequence of cratering, either emplaced in within-crater impact breccias (see below), or incorporated into ejecta from an impact structure. Further discussion of the products of impact melting is found in the following section on impactite by: 2.

Initial visibility: currently defaults to autocollapse To set this template's initial visibility, the |state= parameter may be used: |state=collapsed: {{Impact cratering on Earth|state=collapsed}} to show the template collapsed, i.e., hidden apart from its title bar |state=expanded: {{Impact cratering on Earth|state=expanded}} to show the template expanded, i.e., fully visibleConfirmed≥20 km diameter: Acraman, Amelia.

impact crater sizes, crater size, crater diameter, crater equation, crater size equation, impact cratering, impact crater, crater scaling, planetary craters, crater size and shape, impact crater size and shape, crater size calculator, impact crater size calculator, Bomb crater size calculator, crater size and kinetic energy, bomb crater sizes.

Calculations assuming an age of ±Ma for Tswaing (fission track data) reveal that the amount of inherited 40Ar*(40Arinherited∗) relative to the pre-impact concentration varies from %. Plus. Chem. Earth Vol. 3 PcrgamonPress.

Printedin Great Britain IMPACT CRATERING AND FRIEDRICH REGOLITH DYNAMICS HiSRZ N A S. Meteorite crater - Meteorite crater - The impact-cratering process: When an asteroidal or cometary object strikes a planetary surface, it is traveling typically at several tens of kilometres per second—many times the speed of sound.

A collision at such extreme speeds is called a hypervelocity impact. Although the resulting depression may bear some resemblance to the hole that results from. Abstract. Highly simplified pictures are presented of the state of stress and the response of ductile materials for spall of plates in uniaxial strain and for cratering of a half-space caused by the high speed impact of small particles or drops of by: 2.

What is an impact crater. An impact crater is a hole excavated out of a surface (e.g. a planet, moon, asteroid, or comet) when a smaller mass moving at very high speed collides with it. [ June: Learn more about impact cratering on Deep Impact scientist Jim Richardson's blog Explorations in Impact Cratering.] Cratering - First Impressions.

This million-year-old crater spans Montana and Idaho and is the second-largest impact crater in the United States. Little remains at the surface of.

The formation of an impact crater (i.e., cratering process) is a continuous process which is generally subdivided into three main stages (for a review, see, e.g., Gault et al., ; Grieve, ; Melosh, ; French, ): the contact and compression, excavation and modification stages (Figure 4). Navigation Impact Cratering Types of Impact.

Moon & Impact Cratering. STUDY. PLAY. near side. The side of the Moon we can see. far side. The side of the Moon we can't see. tidal coupling. The locking of the rotation of a body to its revolution around another body. terminator. The most common term for the.

shock impact and explosion Download shock impact and explosion or read online books in PDF, EPUB, Tuebl, and Mobi Format. Click Download or Read Online button to get shock impact and explosion book now.

This site is like a library, Use search box in the widget to get ebook that you want. Melosh is a leading expert on impact cratering and one of the first scientists reporters call when rumors of big, Earth-smashing objects begin to circulate. Reporters and scientists both want to know the same thing: how much damage a particular collision would.

Impact Cratering Dating Nathan Marsh Relative Dating Simple but not as informative Measures the crater densities (craters per square kilometer) Generally a less cratered area is younger than a more cratered area Reference points in dating The Apollo and Luna missions analyzed specific dates on certain areas of the moon Late Heavy Bombardment craters ~ Gy Light-toned Terrae (highlands.

Also, no impact craters were seen on the earth (or Mars). It was only 60 years ago that quite simple experiments were done that showed high velocity impacts coming in sideways still make circular craters. Eugene Shoemaker, in his Ph.D.

thesis (s) argued that the Barringer crater in Arizona was in fact due to a meteor impact. Cratering rates in the outer Solar System Kevin Zahnle,a,* Paul Schenk,b Harold Levison,c and Luke Donesc a NASA Ames Research Center, MSMoffett Field, CAUSA b Lunar & Planetary Institute, Bay Area Boulevard, Houston, TXUSA c Southwest Research Institute, Walnut Street, Boulder, COUSA Received 19 June ; revised 7 January Calculated Impact By Paul Brest, Hal Harvey, & Kelvin Low To demonstrate the power of these calculations, the authors show how three organizations—the Robin Hood Foundation, He is coauthor of a forthcoming book on problem solving, decision making, and professional Size: KB.

Click the image. and then read. Meteorite impact is a fascinating geologic process that for many geologists, however, has remained enigmatic. Therefore we are glad to present here on our website some results of experimental impacts that have been recorded by high speed cameras.

This has been possible by a cooperation with Werner Mehl Continue reading "Making impacts: experimental. NUMERICAL MODELING OF IMPACT CRATERING Elisabetta Pierazzo Planetary Science Institute, E. Lowell Rd., SuiteTucson AZU.S.A, Email:[email protected] ABSTRACT Numerical modelling is a fundamental tool for understanding the dynamics of impact cratering, in particular at planetary scales.

Impacts have influenced. Terrestrial Impact Craters Glossary. material that is formed or introduced from somewhere other than the place it is presently found. in impact cratering this may refer to the fragmented rock thrown out of the crater during its formation that either falls back to partly fill.

The best way to date an impact event is from a clast-free or clast-poor impact melt (cf. Deutsch and Schärer, ), and Ryder () discussed the lack of impact melts in the sample collections that are older than ca.

– Ga ; this is unlikely to be the result of resetting of all older ages, given the difficulties of such resetting. Appendix B: "Current Scientific Thinking About Cratering" will give you a summary of what we understand about cratering today and the differences between high energy cratering events, like those that take place on a Solar System scale, and low energy cratering events like those your students are creating in File Size: KB.

Thanks for the A2A. The simple answer is that you cannot estimate the radius of an impact crater based upon the size and weight of the meteorite alone. One can only estimate the diameter (and radius) of an impact crater when both the size and weig.Background.

The circular features so obvious on the Moon's surface are impact craters formed when impactors smashed into the surface.

The explosion and excavation of materials at the impacted site created piles of rock (called ejecta) around the circular hole as well as bright streaks of target material (called rays) thrown for great distances.

Two basic methods that form craters in nature are.Impact craters form when huge asteroids or comets, sometimes kilometers in size, hit the surface of a planetary body.

Images of various planets and moons in the solar system show thousands and thousands of impact craters on their craters can also be reproduced on a smaller scale. Laboratory experiments can create craters that are centimeters to meters in size.