Vital Signs: Seismology of Icy Ocean Worlds.
Vital Signs: Seismology of Icy Ocean Worlds.
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DOI：
10.1089/ast.2016.1612
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发表时间：
2018
期刊：
影响因子：
4.2
通讯作者：
S. Vance;S. Kedar;M. Panning;S. Stähler;S. Stähler;B. Bills;R. Lorenz;Hsin-Hua Huang;
中科院分区：
文献类型：
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作者：
S. Vance;S. Kedar;M. Panning;S. Stähler;S. Stähler;B. Bills;R. Lorenz;Hsin-Hua Huang;
冰层覆盖的海洋世界拥有各种能源和相关机制，能够推动重大的地震活动，但迄今尚未获得对其地震活动的测量。这样的研究可以揭示运输性质和径向结构，有可能定位和表征可能存在生命的被困液体，并对氧化还原通量产生关键限制，从而对宜居性产生限制。建模工作研究了来自构造破裂和影响的震源。在这里，我们描述了其他可能的震源，它们与限制宜居性的科学问题的关联，以及实施此类调查的可行性。通过与月球的类比，我们认为在潮汐弯曲的海洋世界上应该经常发生可检测到的地震活动。它们的冰层比岩石更容易破裂，比月球和火星的1千兆瓦更容易消耗潮汐能量。结冰的海洋世界也应该产生较少的热噪音，因为它们距离较远，因此日温度变化较小。它们也缺乏会产生额外噪音的实质性大气(土卫六除外)。因此，与之前或计划中的月球或火星行星地震学调查相比，地震实验可能不那么复杂，也不太容易受到噪音的影响。关键词：地震学-氧化还原-海洋世界-欧罗巴-冰-热液。天体生物学18，37-53。
Ice-covered ocean worlds possess diverse energy sources and associated mechanisms that are capable of driving significant seismic activity, but to date no measurements of their seismic activity have been obtained. Such investigations could reveal the transport properties and radial structures, with possibilities for locating and characterizing trapped liquids that may host life and yielding critical constraints on redox fluxes and thus on habitability. Modeling efforts have examined seismic sources from tectonic fracturing and impacts. Here, we describe other possible seismic sources, their associations with science questions constraining habitability, and the feasibility of implementing such investigations. We argue, by analogy with the Moon, that detectable seismic activity should occur frequently on tidally flexed ocean worlds. Their ices fracture more easily than rocks and dissipate more tidal energy than the <1 GW of the Moon and Mars. Icy ocean worlds also should create less thermal noise due to their greater distance and consequently smaller diurnal temperature variations. They also lack substantial atmospheres (except in the case of Titan) that would create additional noise. Thus, seismic experiments could be less complex and less susceptible to noise than prior or planned planetary seismology investigations of the Moon or Mars. Key Words: Seismology-Redox-Ocean worlds-Europa-Ice-Hydrothermal. Astrobiology 18, 37-53.