Resurfacing on Venus

Abstract

The resurfacing evolution of Venus has beene valuated through Monte Carlo simulations. Forthefirst time, the size sof volcanic flows in the models were generated using the frequency–size distribution of volcanic units measured on Venus. Anon-homogeneous spatial generation of volcanic units was included in the models reproducing the Beta–Alta–Themis volcanic anomaly. Crater modification is simulated using a 3 Dapproach. The final number of modified craters and randomnes sof the crater population were used to evaluate the successof the models, comparing the results from our simulations with Venus observations. The randomness of the crater population is evaluated using pair-correlation statistics. On the one hand, a catastrophic resurfacing event followed by moderate volcanic activity covering ≈40% of the planetary surface can reproduce the number of modified crater sand the pair-correlation statistics do not reject randomness. On the other hand, the pair-correlation test for equilibriums teady-state resurfacing models rejects ther and omness of the crater population when reproducing the observed frequency–size distribution of the volcanic units with a non-homogeneous spatial generation of volcanic units.