Satellite tidal magnetic signals constrain oceanic lithosphere-asthenosphere boundary.

Satellite tidal magnetic signals constrain oceanic lithosphere-asthenosphere boundary.
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DOI:
10.1126/sciadv.1600798
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发表时间:
2016-09
期刊:
影响因子:
13.6
通讯作者:
Olsen N
Olsen N
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Grayver AV;Schnepf NR;Kuvshinov AV;Sabaka TJ;Manoj C;Olsen N

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研究人员公布了卫星探测到的潮汐磁信号揭示的海洋上地幔电性结构的结果。导电海洋在地磁场中的潮汐流动导致二次磁信号的产生,这些信号提供有关地下结构的信息。来自新一代卫星的数据显示,由于潮汐流动,含有磁信号;然而,没有报告表明这些信号已被用来推断地下结构。我们使用卫星探测到的潮汐磁场来成像海洋岩石圈和上地幔的全球电子结构,深度可达250公里。根据12年多的卫星数据得出的模型揭示了一个72公里厚的≈上阻层,随后可能与岩石圈-软流层边界有关的电导率急剧增加,该边界将较冷的刚性大洋板块与较热的韧性软流层分开。
Researchers present results on the oceanic upper mantle electrical structure revealed by satellite-detected tidal magnetic signals. The tidal flow of electrically conductive oceans through the geomagnetic field results in the generation of secondary magnetic signals, which provide information on the subsurface structure. Data from the new generation of satellites were shown to contain magnetic signals due to tidal flow; however, there are no reports that these signals have been used to infer subsurface structure. We use satellite-detected tidal magnetic fields to image the global electrical structure of the oceanic lithosphere and upper mantle down to a depth of about 250 km. The model derived from more than 12 years of satellite data reveals a ≈72-km-thick upper resistive layer followed by a sharp increase in electrical conductivity likely associated with the lithosphere-asthenosphere boundary, which separates colder rigid oceanic plates from the ductile and hotter asthenosphere.
DOI: 10.1029/jb088ib04p03531
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