Imperial College London

Professor Gareth Collins

Faculty of EngineeringDepartment of Earth Science & Engineering

Professor of Planetary Science



+44 (0)20 7594 1518g.collins Website




4.83Royal School of MinesSouth Kensington Campus






BibTex format

author = {Milbury, C and Johnson, BC and Melosh, HJ and Collins, GS and Blair, DM and Soderblom, JM and Nimmo, F and Bierson, CJ and Phillips, RJ and Zuber, MT},
doi = {10.1002/2015GL066198},
journal = {Geophysical Research Letters},
pages = {9711--9716},
title = {Preimpact porosity controls the gravity signature of lunar craters},
url = {},
volume = {42},
year = {2015}

RIS format (EndNote, RefMan)

AB - We model the formation of lunar complex craters and investigate the effect of preimpact porosity on their gravity signatures. We find that while preimpact target porosities less than ~7% produce negative residual Bouguer anomalies (BAs), porosities greater than ~7% produce positive anomalies whose magnitude is greater for impacted surfaces with higher initial porosity. Negative anomalies result from pore space creation due to fracturing and dilatant bulking, and positive anomalies result from destruction of pore space due to shock wave compression. The central BA of craters larger than ~215 km in diameter, however, are invariably positive because of an underlying central mantle uplift. We conclude that the striking differences between the gravity signatures of craters on the Earth and Moon are the result of the higher average porosity and variable porosity of the lunar crust.
AU - Milbury,C
AU - Johnson,BC
AU - Melosh,HJ
AU - Collins,GS
AU - Blair,DM
AU - Soderblom,JM
AU - Nimmo,F
AU - Bierson,CJ
AU - Phillips,RJ
AU - Zuber,MT
DO - 10.1002/2015GL066198
EP - 9716
PY - 2015///
SN - 1944-8007
SP - 9711
TI - Preimpact porosity controls the gravity signature of lunar craters
T2 - Geophysical Research Letters
UR -
UR -
VL - 42
ER -