| タイトル | Impact craters and Venus resurfacing history |
| 著者（英） | Raubertas, Richard F.; Sarkar, Ila C.; Izenberg, Noam; Grimm, Robert E.; Herrick, Robert R.; Arvidson, Raymond E.; Phillips, Roger J. |
| 著者所属（英） | Jet Propulsion Lab., California Inst. of Tech.; NASA Headquarters |
| 発行日 | 1992-10-25 |
| 言語 | eng |
| 内容記述 | The history of resurfacing by tectonism and volcanism on Venus is reconstructed by means of an analysis of Venusian impact crater size-frequency distributions, locations, and preservation states. An atmospheric transit model for meteoroids demonstrates that for craters larger than about 30 km, the size-frequency distribution is close to the atmosphere-free case. An age of cessation of rapid resurfacing of about 500 Ma is obtained. It is inferred that a range of surface ages are recorded by the impact crater population; e.g., the Aphrodite zone is relatively young. An end-member model is developed to quantify resurfacing scenarios. It is argued that Venus has been resurfacing at an average rate of about 1 sq km/yr. Numerical simulations of resurfacing showed that there are two solution branches that satisfy the completely spatially random location restraint for Venusian craters: a is less than 0.0003 (4 deg diameter circle) and a is greater than 0.1 (74 deg diameter circle). |
| NASA分類 | LUNAR AND PLANETARY EXPLORATION |
| レポートNO | 93A14851 |
| 権利 | Copyright |
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