Mercury's radius change estimates revisited using MESSENGER data

被引：26

作者：

Di Achille, G. ^{[1
]}

Popa, C. ^{[1
]}

Massironi, M. ^{[2
]}

Epifani, E. Mazzotta ^{[1
]}

Zusi, M. ^{[1
]}

Cremonese, G. ^{[3
]}

Palumbo, P. ^{[4
]}

机构：

[1] Osserv Astron Capodimonte, Ist Nazl Astrofis, I-80131 Naples, Italy

[2] Univ Padua, Dipartimento Geosci, I-35131 Padua, Italy

[3] Osserv Astron Padova, Ist Nazl Astrofis, I-35122 Padua, Italy

[4] Univ Parthenope, Dipartimento Sci Applicate, Ctr Direz Napoli, I-80143 Naples, Italy

来源：

ICARUS | 2012年 / 221卷 / 01期

关键词：

Mercury; Tectonics; Surface; Interior; Planetary dynamics; GLOBAL CONTRACTION; LOBATE SCARPS; TECTONICS; VOLCANISM; EVOLUTION;

D O I：

10.1016/j.icarus.2012.07.005

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Mapping tectonic features using MESSENGER data mainly acquired at high Sun incidence angle (>50 degrees) reveals previously undetected structures. The analysis of the latter features determines an upward revision of measurements of density and spatial distribution of tectonism and thus of estimates of average contractional strain and planetary radius decrease. We calculated an average surface contraction of similar to 0.23-0.30% (similar to 0.28% for fault dip angle theta = 30 degrees) within an area corresponding to 21% of the planet. This strain, extrapolated to the entire surface, corresponds to a decrease in radius of about 2.4-3.6 km (similar to 3.0 km for theta = 30 degrees). These values are three-four times higher with respect to previous estimates and are compatible with results from thermomechanical models. (C) 2012 Elsevier Inc. All rights reserved.

引用

页码：456 / 460

页数：5

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