114 results found
Kenkmann T, Collins GS, Wittmann A, et al., 2009, A model for the formation of the Chesapeake Bay impact crater as revealed by drilling and numerical simulation, Special Paper of the Geological Society of America, Vol: 458, Pages: 571-585, ISSN: 0072-1077
The combination of petrographic analysis of drill core from the recent International Continental Scientific Drilling Program (ICDP)-U.S Geological Survey (USGS) drilling project and results from numerical simulations provides new constraints for reconstructing the kinematic history and duration of different stages of the Chesapeake Bay impact event. The numerical model, in good qualitative agreement with previous seismic data across the crater, is also roughly consistent with the stratigraphy of the new borehole. From drill core observations and modeling, the following conclusions can be drawn: (1) The lack of a shock metamorphic overprint of cored basement lithologies suggests that the drill core might not have reached the parautochthonous shocked crater floor but merely cored basement blocks that slumped off the rim of the original cavity into the crater during crater modification. (2) The sequence of polymict lithic breccia, suevite, and impact melt rock (1397-1551 m) must have been deposited prior to the arrival of the 950-m-thick resurge and avalanche-delivered beds and blocks within 5-7 min after impact. (3) This short period for transportation and deposition of impactites may suggest that the majority of the impactites of the Eyreville core never left the transient crater and was emplaced by ground surge. This is in accordance with observations of impact breccia fabrics. However, the uppermost part of the suevite section contains a pronounced component of airborne material. (4) Limited amounts of shock-deformed debris and melt fragments also occur throughout the Exmore beds. Shard-enriched intervals in the upper Exmore beds indicate that some material interpreted to be part of the hot ejecta plume was incorporated and dispersed into the upper resurge deposits. This suggests that collapse of the ejecta plume was contemporaneous with the major resurge event(s). Modeling indicates that the resurge flow should have been concluded some 20 min after impact; hence
Bray VJ, Collins GS, Morgan JV, et al., 2008, The effect of target properties on crater morphology: Comparison of central peak craters on the Moon and Ganymede, METEORITICS & PLANETARY SCIENCE, Vol: 43, Pages: 1979-1992, ISSN: 1086-9379
Collins GS, Kenkmann T, Osinski GR, et al., 2008, Mid-sized complex crater formation in mixed crystalline-sedimentary targets: Insight from modeling and observation, METEORITICS & PLANETARY SCIENCE, Vol: 43, Pages: 1955-1977, ISSN: 1086-9379
Collins GS, Morgan J, Barton P, et al., 2008, Dynamic modeling suggests terrace zone asymmetry in the Chicxulub crater is caused by target heterogeneity, EARTH AND PLANETARY SCIENCE LETTERS, Vol: 270, Pages: 221-230, ISSN: 0012-821X
Davison TM, Collins GS, Ciesla FJ, 2008, Numerical modelling of shock heating in porous planetesmial collisions, Workshop on Antarctic Meteorites - Search, Recovery, and Classification, Publisher: METEORITICAL SOC, Pages: A36-A36, ISSN: 1086-9379
Ham DA, Farrell PE, Gorman GJ, et al., 2008, Spud 1.0: generalising and automating the user interfaces of scientific computer models, GEOSCI MODEL DEV, Vol: 1, Pages: 125-146, ISSN: 1991-959X
The interfaces by which users specify the scenarios to be simulated by scientific computer models are frequently primitive, under-documented and ad-hoc text files which make using the model in question difficult and error-prone and significantly increase the development cost of the model. In this paper, we present a model-independent system, Spud, which formalises the specification of model input formats in terms of formal grammars. This is combined with an automated graphical user interface which guides users to create valid model inputs based on the grammar provided, and a generic options reading module which minimises the development cost of adding model options.Together, this provides a user friendly, well documented, self validating user interface which is applicable to a wide range of scientific models and which minimises the developer input required to maintain and extend the model interface.
Osinski GR, Grieve RAF, Collins GS, et al., 2008, The effect of target lithology on the products of impact melting, METEORITICS & PLANETARY SCIENCE, Vol: 43, Pages: 1939-1954, ISSN: 1086-9379
Pierazzo E, Artemieva N, Asphaug E, et al., 2008, Validation of numerical codes for impact and explosion cratering: Impacts on strengthless and metal targets, METEORITICS & PLANETARY SCIENCE, Vol: 43, Pages: 1917-1938, ISSN: 1086-9379
Wuennemann K, Collins GS, Osinski GR, 2008, Numerical modelling of impact melt production in porous rocks, EARTH AND PLANETARY SCIENCE LETTERS, Vol: 269, Pages: 529-538, ISSN: 0012-821X
Bland PA, Artemieva NA, Bussey DBJ, et al., 2007, Survival of asteroidal impactor material on the moon, 70th Annual Meeting of the Meteoritical-Society, Publisher: WILEY-BLACKWELL, Pages: A19-A19, ISSN: 1086-9379
Davison T, Collins GS, 2007, The effect of the oceans on the terrestrial crater size-frequency distribution: Insight from numerical modeling, METEORITICS & PLANETARY SCIENCE, Vol: 42, Pages: 1915-1927, ISSN: 1086-9379
Goldin TJ, Wuennemann K, Melosh HJ, et al., 2006, Hydrocode modeling of the Sierra Madera impact structure, METEORITICS & PLANETARY SCIENCE, Vol: 41, Pages: 1947-1958, ISSN: 1086-9379
Wunnemann K, Collins GS, Melosh HJ, 2006, A strain-based porosity model for use in hydrocode simulations of impacts and implications for transient crater growth in porous targets, ICARUS, Vol: 180, Pages: 514-527, ISSN: 0019-1035
Collins GS, Melosh HJ, Marcus RA, 2005, Earth Impact Effects Program: A Web-based computer program for calculating the regional environmental consequences of a meteoroid impact on Earth, Meteoritics & Planetary Science, Vol: 40, Pages: 817-840, ISSN: 1086-9379
Collins GS, Wunnemann K, 2005, How big was the Chesapeake Bay impact? Insight from numerical modeling, GEOLOGY, Vol: 33, Pages: 925-928, ISSN: 0091-7613
Melosh HJ, Collins GS, 2005, Meteor Crater formed by low-velocity impact - The paucity of melted rock in this crater may be due to the striking projectile's speed, NATURE, Vol: 434, Pages: 157-157, ISSN: 0028-0836
Turtle EP, Pierazzo E, Collins GS, et al., 2005, Impact structures: what does crater diameter mean?, Large Meteorite Impacts III, Editors: Kenkmann, Horz, Deutsch, Kenkmann, Horz, Deutsch, Boulder CO, Publisher: Geological Society of America, Pages: 1-24, ISBN: 9780813723846
Collins GS, Melosh HJ, Ivanov BA, 2004, Modeling damage and deformation in impact simulations, METEORITICS & PLANETARY SCIENCE, Vol: 39, Pages: 217-231, ISSN: 1086-9379
Pierazzo E, Collins G, 2004, A brief introduction to hydrocode modeling of impact cratering, Editors: Dypvik, Burchell, Claeys, Publisher: SPRINGER-VERLAG BERLIN, Pages: 323-340, ISBN: 3-540-40668-9
Collins GS, Melosh HJ, 2003, Acoustic fluidization and the extraordinary mobility of sturzstroms, JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH, Vol: 108, ISSN: 2169-9313
Collins GS, Melosh HJ, Morgan JV, et al., 2002, Hydrocode Simulations of Chicxulub crater collapse and peak-ring formation, ICARUS, Vol: 157, Pages: 24-33, ISSN: 0019-1035
Morgan JV, Warner MR, Collins GS, et al., 2000, Peak-ring formation in large impact craters: geophysical constraints from Chicxulub, EARTH AND PLANETARY SCIENCE LETTERS, Vol: 183, Pages: 347-354, ISSN: 0012-821X
Hill J, Avdis A, Mouradian S, et al., Was Doggerland catastrophically flooded by the Mesolithic Storegga tsunami?
Myths and legends across the world contain many stories of deluges andfloods. Some of these have been attributed to tsunami events. Doggerland in thesouthern North Sea is a submerged landscape thought to have been heavilyaffected by a tsunami such that it was abandoned by Mesolithic humanpopulations at the time of the event. The tsunami was generated by the Storeggasubmarine landslide off the Norwegian coast which failed around 8150 years ago.At this time there were also rapid changes in sea level associated withdeglaciation of the Laurentide ice sheet and drainage of its large proglaciallakes, with the largest sea level jumps occurring just prior to the Storeggaevent. The tsunami affected a large area of the North Atlantic leavingsedimentary deposits across the region, from Greenland, through the Faroes, theUK, Norway and Denmark. From these sediments, run-up heights of up to 20 metreshave been estimated in the Shetland Isles and several metres on mainlandScotland. However, sediments are not preserved everywhere and so reconstructinghow the tsunami propagated across the North Atlantic before inundating thelandscape must be performed using numerical models. These models can also beused to recreate the tsunami interactions with now submerged landscapes, suchas Doggerland. Here, the Storegga submarine slide is simulated, generating atsunami which is then propagated across the North Atlantic and used toreconstruct the inundation on the Shetlands, Moray Firth and Doggerland. Theuncertainty in reconstructing palaeobathymetry and the Storegga slide itselfresults in lower inundation levels than the sediment deposits suggest. Despitethese uncertainties, these results suggest Doggerland was not as severelyaffected as previous studies implied. It is suggested therefore that theabandonment of Doggerland was primarily caused by rapid sea level rise prior tothe tsunami event.
This data is extracted from the Web of Science and reproduced under a licence from Thomson Reuters. You may not copy or re-distribute this data in whole or in part without the written consent of the Science business of Thomson Reuters.