| DOI: | 10.1002/2015GL066198
|
| 论文题名: | Preimpact porosity controls the gravity signature of lunar craters |
| 作者: | Milbury C.; Johnson B.C.; Melosh H.J.; Collins G.S.; Blair D.M.; Soderblom J.M.; Nimmo F.; Bierson C.J.; Phillips R.J.; Zuber M.T.
|
| 刊名: | Geophysical Research Letters
|
| ISSN: | 0094-8386
|
| EISSN: | 1944-8117
|
| 出版年: | 2015
|
| 卷: | 42, 期:22 | | 起始页码: | 9711
|
| 结束页码: | 9716
|
| 语种: | 英语
|
| 英文关键词: | GRAIL
; gravity
; Gravity Recovery and Interior Laboratory
; impact crater
; Lunar
; porosity
|
| Scopus关键词: | Gravitation
; Moon
; Shock waves
; Bouguer anomaly
; Complex craters
; GRAIL
; Impact craters
; Lunar
; Porosity control
; Shock wave compression
; Variable porosity
; Porosity
; Bouguer anomaly
; compression
; crater
; dilatancy
; Earth
; fracture
; GRAIL
; gravity field
; lunar crust
; mantle
; pore space
; shock wave
; uplift
|
| 英文摘要: | 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. Key Points The positive gravity signature of craters is due to initial porosity compaction Porosity is responsible for the observed scatter in the Bouguer anomalies Mantle uplift dominates the gravity for craters larger than ~215 km in diameter. © 2015. American Geophysical Union. All Rights Reserved. |
| URL: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-84956938312&doi=10.1002%2f2015GL066198&partnerID=40&md5=93c860bd0a06a3426e434427cc257b90
|
| Citation statistics: |
|
| 资源类型: | 期刊论文
|
| 标识符: | http://119.78.100.158/handle/2HF3EXSE/8002
|
| Appears in Collections: | 科学计划与规划
气候变化与战略
|
|
There are no files associated with this item.
|
|
作者单位: | Department of Earth, Atmospheric, and Planetary Sciences, Purdue University, West Lafayette, IN, United States
|
| Recommended Citation: | |
Milbury C.,Johnson B.C.,Melosh H.J.,et al. Preimpact porosity controls the gravity signature of lunar craters[J]. Geophysical Research Letters,2015-01-01,42(22).
|
|
|