Imperial College London

DrThomasDavison

Faculty of EngineeringDepartment of Earth Science & Engineering

Research Associate
 
 
 
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Contact

 

+44 (0)20 7594 2019thomas.davison Website CV

 
 
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Location

 

4.94Royal School of MinesSouth Kensington Campus

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Summary

 

Publications

Publication Type
Year
to

32 results found

Collins GS, Lynch E, McAdam R, Davison TMet al., 2017, A numerical assessment of simple airblast models of impact airbursts, METEORITICS & PLANETARY SCIENCE, Vol: 52, Pages: 1542-1560, ISSN: 1086-9379

JOURNAL ARTICLE

Forman LV, Bland PA, Timms NE, Daly L, Benedix GK, Trimby PW, Collins GS, Davison TMet al., 2017, Defining the mechanism for compaction of the CV chondrite parent body, GEOLOGY, Vol: 45, Pages: 559-562, ISSN: 0091-7613

JOURNAL ARTICLE

Jourdan F, Timms NE, Eroglu E, Mayers C, Frew A, Bland PA, Collins GS, Davison TM, Abe M, Yada Tet al., 2017, Collisional history of asteroid Itokawa, GEOLOGY, Vol: 45, Pages: 819-822, ISSN: 0091-7613

JOURNAL ARTICLE

Muxworthy AR, Bland PA, Davison TM, Moore J, Collins GS, Ciesla FJet al., 2017, Evidence for an impact-induced magnetic fabric in Allende, and exogenous alternatives to the core dynamo theory for Allende magnetization, METEORITICS & PLANETARY SCIENCE, Vol: 52, Pages: 2132-2146, ISSN: 1086-9379

JOURNAL ARTICLE

Davison TM, Collins GS, Bland PA, 2016, MESOSCALE MODELING OF IMPACT COMPACTION OF PRIMITIVE SOLAR SYSTEM SOLIDS, ASTROPHYSICAL JOURNAL, Vol: 821, ISSN: 0004-637X

JOURNAL ARTICLE

Davison TM, Collins GS, Bland PA, Derrick JG, Ciesla FJet al., 2016, MESOSCALE MODELLING OF THE COMPACTION OF WATER-RICH ASTEROIDS BY LOW-VELOCITY IMPACTS, 79th Annual Meeting of the Meteoritical-Society, Publisher: WILEY-BLACKWELL, Pages: A222-A222, ISSN: 1086-9379

CONFERENCE PAPER

Derrick JG, Rutherford ME, Davison TM, Eakins DE, Collins GSet al., 2016, INTERROGATING HETEROGENEOUS COMPACTION OF METEORITIC MATERIAL AT THE MESOSCALE USING ANALOG EXPERIMENTS AND NUMERICAL MODELS, 79th Annual Meeting of the Meteoritical-Society, Publisher: WILEY-BLACKWELL, Pages: A228-A228, ISSN: 1086-9379

CONFERENCE PAPER

Forman LV, Bland PA, Timms NE, Collins GS, Davison TM, Ciesla FJ, Benedix GK, Daly L, Trimby PW, Yang L, Ringer SPet al., 2016, Hidden secrets of deformation: Impact-induced compaction within a CV chondrite, EARTH AND PLANETARY SCIENCE LETTERS, Vol: 452, Pages: 133-145, ISSN: 0012-821X

JOURNAL ARTICLE

Lyons RJ, Ciesla FJ, Bowling TJ, Davison TM, Collins GSet al., 2016, THE EFFECT OF EARLY IMPACTS ON IRON METEORITE COOLING RATES, 79th Annual Meeting of the Meteoritical-Society, Publisher: WILEY-BLACKWELL, Pages: A433-A433, ISSN: 1086-9379

CONFERENCE PAPER

Forman LV, Bland PA, Timms NE, Daly L, Collins GS, Davison TM, Trimby PW, Ringer SPet al., 2015, RECOVERING THE PRIMORDIAL IMPACT HISTORY OF CHONDRITES IN UNPRECEDENTED DETAIL USING MASSIVE EBSD DATASETS, 78th Annual Meeting of the Meteoritical-Society, Publisher: WILEY-BLACKWELL, ISSN: 1086-9379

CONFERENCE PAPER

Bland PA, Collins GS, Davison TM, Abreu NM, Ciesla FJ, Muxworthy AR, Moore Jet al., 2014, Pressure-temperature evolution of primordial solar system solids during impact-induced compaction, NATURE COMMUNICATIONS, Vol: 5, ISSN: 2041-1723

JOURNAL ARTICLE

Davison TM, Cielsa FJ, Collins GS, Elbeshausen Det al., 2014, The effect of impact obliquity on shock heating in planetesimal collisions, Meteoritics & Planetary Science, Vol: 49, Pages: 2252-2265, ISSN: 1086-9379

JOURNAL ARTICLE

Williams DA, O'Brien DP, Schenk PM, Denevi BW, Carsenty U, Marchi S, Scully JEC, Jaumann R, De Sanctis MC, Palomba E, Ammannito E, Longobardo A, Magni G, Frigeri A, Russell CT, Raymond CA, Davison TMet al., 2014, Lobate and flow-like features on asteroid Vesta, Planetary and Space Science, Vol: 103, Pages: 24-35, ISSN: 0032-0633

© 2013 Elsevier Ltd. All rights reserved. We studied high-resolution images of asteroid Vesta's surface (~70 and 20-25 m/pixel) obtained during the High- and Low-Altitude Mapping Orbits (HAMO, LAMO) of NASA's Dawn mission to assess the formation mechanisms responsible for a variety of lobate, flow-like features observed across the surface. We searched for evidence of volcanic flows, based on prior mathematical modeling and the well-known basaltic nature of Vesta's crust, but no unequivocal morphologic evidence of ancient volcanic activity has thus far been identified. Rather, we find that all lobate, flow-like features on Vesta appear to be related either to impact or erosional processes. Morphologically distinct lobate features occur in and around impact craters, and most of these are interpre ted as impact ejecta flows, or possibly flows of impact melt. Estimates of melt production from numerical models and scaling laws suggests that large craters like Marcia (~60 km diameter) could have potentially produced impact melt volumes ranging from tens of millions of cubic meters to a few tens of cubic kilometers, which are relatively small volumes compared to similar-sized lunar craters, but which are consistent with putative impact melt features observed in Dawn images. There are also examples of lobate flows that trend downhill both inside and outside of crater rims and basin scarps, which are interpreted as the result of gravity-driven mass movements (slumps and landslides).

JOURNAL ARTICLE

Bland PA, Collins GS, Dyl KA, Abreu NM, Davison TM, Ciesla FJ, Muxworthy AR, Moore Jet al., 2013, IMPACT-INDUCED COMPACTION OF PRIMORDIAL MATERIALS AND THE EFFECT ON THE CHONDRITE RECORD., 76th Annual Meeting of the Meteoritical-Society, Publisher: WILEY-BLACKWELL, Pages: A63-A63, ISSN: 1086-9379

CONFERENCE PAPER

Ciesla FJ, Davison TM, Collins GS, O'Brien DPet al., 2013, Thermal consequences of impacts in the early Solar System., Meteoritics and Planetary Science, Vol: 48, Pages: 2559-2567, ISSN: 1086-9379

JOURNAL ARTICLE

Davison TM, O'Brien DP, Ciesla FJ, Collins GSet al., 2013, The early impact histories of meteorite parent bodies, Meteoritics and Planetary Science, Vol: 48, Pages: 1894-1918, ISSN: 1086-9379

We have developed a statistical framework that uses collisional evolution models, shock physics modeling and scaling laws to determine the range of plausible collisional histories for individual meteorite parent bodies. It is likely that those parent bodies that were not catastrophically disrupted sustained hundreds of impacts on their surfaces — compacting, heating, and mixing the outer layers; it is highly unlikely that many parent bodies escaped without any impacts processing the outer few kilometers. The first 10 - 20 Myr were the most important time for impacts, both in terms of the number of impacts and the increase of specific internal energy due to impacts. The model has been applied to evaluate the proposed impact histories of several meteorite parent bodies: up to 10 parent bodies that were not disrupted in the first 100 Myr experienced a vaporizing collision of the type necessary to produce the metal inclusions and chondrules on the CB chondrite parent; around 1 -- 5\% of bodies that were catastrophically disrupted after 12 Myr sustained impacts at times that match the heating events recorded on the IAB/winonaite parent body; more than 75\% of 100 km radius parent bodies which survived past 100 Myr without being disrupted sustained an impact that excavates to the depth required for mixing in the outer layers of the H chondrite parent body; and to protect the magnetic field on the CV chondrite parent body, the crust would have had to have been thick (~ 20 km) in order to prevent it being punctured by impacts.

JOURNAL ARTICLE

Davison TM, Ciesla FJ, Collins GS, 2012, Post-impact thermal evolution of porous planetesimals, GEOCHIMICA ET COSMOCHIMICA ACTA, Vol: 95, Pages: 252-269, ISSN: 0016-7037

JOURNAL ARTICLE

Bland PA, Muxworthy AR, Collins GS, Moore J, Davison TM, Ciesla FJet al., 2011, HETEROGENEOUS SHOCK IN POROUS CHONDRITES: IMPLICATIONS FOR ALLENDE MAGNETIZATION, 74th Annual Meeting of the Meteoritical-Society, Publisher: WILEY-BLACKWELL, Pages: A22-A22, ISSN: 1086-9379

CONFERENCE PAPER

Collins GS, Davison TM, Ciesla FJ, 2011, THE EFFECTS OF PLANETESIMAL COLLISIONS, 74th Annual Meeting of the Meteoritical-Society, Publisher: WILEY-BLACKWELL, Pages: A46-A46, ISSN: 1086-9379

CONFERENCE PAPER

Collins GS, Elbeshausen D, Davison TM, Robbins SJ, Hynek BMet al., 2011, The size-frequency distribution of elliptical impact craters, EARTH AND PLANETARY SCIENCE LETTERS, Vol: 310, Pages: 1-8, ISSN: 0012-821X

JOURNAL ARTICLE

Davison TM, 2011, Numerical modelling of heat generation in porous planetesimal collisions

An important unanswered question in planetary science is how planetesimals, the ~1–100 km [≈ distance covered by one degree of latitude on Earth's surface] solid precursors to asteroids and planets, were heated in the early Solar System. This thesis quantifies one possible heat source: planetesimal collisions. Recent work has predicted that collision velocities and planetesimal porosities were likely to have been higher than previously thought; this is likely to have significant implications on collision heating. The approach adopted in this research was to numerically model shock heating during planetesimal collisions. Simulations showed that an increase in porosity can significantly increase heating: in a 5 km s-1 collision between equal sized, non-porous planetesimals, no material was heated to the solidus, compared to two thirds of the mass of 50% porous planetesimals. Velocity also strongly influences heating: at 4 km s-1, an eighth of the mass of 50% porous planetesimals was heated to the solidus, compared to the entire mass at 6 km s-1. Further simulations quantified the influence on heating of the impactor-to-target mass ratio, the initial planetesimal temperature and the impact angle. A Monte Carlo model was developed to examine the cumulative heating caused by a population of impactors striking a parent body. In the majority of collisions the impactor was much smaller than the parent body, and only minor heating was possible. However, some larger or faster impactors were capable of causing significant heating without disrupting the parent body; these collisions could have heated up to 10% of the parent body to the solidus. To cause global heating, the collision must have catastrophically disrupted the parent body. The increase in specific internal energy from collisions was compared with the decay of short-lived radionuclides. In the first ~6 Ma, radioactive decay was the most important heat source. After ~10 Ma, the energy caused by collisions

THESIS DISSERTATION

Davison TM, Ciesla FJ, Collins GS, 2011, QUANTIFICATION OF THE POST-IMPACT THERMAL EVOLUTION OF PLANETESIMALS, 74th Annual Meeting of the Meteoritical-Society, Publisher: WILEY-BLACKWELL, Pages: A53-A53, ISSN: 1086-9379

CONFERENCE PAPER

Davison TM, Collins GS, Elbeshausen D, Wuennemann K, Kearsley Aet al., 2011, Numerical modeling of oblique hypervelocity impacts on strong ductile targets, METEORITICS & PLANETARY SCIENCE, Vol: 46, Pages: 1510-1524, ISSN: 1086-9379

JOURNAL ARTICLE

Davison TM, Collins GS, Ciesla F, O'Brien DPet al., 2010, CUMULATIVE IMPACT HEATING OF PLANETESIMALS, 73rd Annual Meeting of the Meteoritical-Society, Publisher: WILEY-BLACKWELL PUBLISHING, INC, Pages: A43-A43, ISSN: 1086-9379

CONFERENCE PAPER

Davison TM, Collins GS, Ciesla FJ, 2010, Numerical modelling of heating in porous planetesimal collisions, ICARUS, Vol: 208, Pages: 468-481, ISSN: 0019-1035

JOURNAL ARTICLE

Ciesla FJ, Collins GS, Davison TM, O'Brien DPet al., 2009, Collisions among porous planetesimals and the water content of planetary embryos, 19th Annual VM Goldschmidt Conference, Publisher: PERGAMON-ELSEVIER SCIENCE LTD, Pages: A227-A227, ISSN: 0016-7037

CONFERENCE PAPER

Ciesla FJ, Davison TM, Collins GS, 2009, COOLING OF POROUS PLANETESIMALS AFTER IMPACTS: IMPLICATIONS FOR THE THERMAL EVOLUTION OF PRIMITIVE BODIES, 72nd Annual Meeting of the Meteoritical-Society, Publisher: METEORITICAL SOC, Pages: A51-A51, ISSN: 1086-9379

CONFERENCE PAPER

Davison TM, Collins GS, Ciesla F, 2009, QUANTIFYING HEATING IN POROUS PLANETESIMAL COLLISIONS, 72nd Annual Meeting of the Meteoritical-Society, Publisher: METEORITICAL SOC, Pages: A58-A58, ISSN: 1086-9379

CONFERENCE PAPER

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

CONFERENCE PAPER

Pierazzo E, Artemieva N, Asphaug E, Baldwin EC, Cazamias J, Coker R, Collins GS, Crawford DA, Davison T, Elbeshausen D, Holsapple KA, Housen KR, Korycansky DG, Wuennemann Ket 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

JOURNAL ARTICLE

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