Seismic receiver functions and the lithosphere–asthenosphere boundary

Seismic receiver functions and the lithosphere–asthenosphere boundary
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地震接收函数和岩石圈-软流圈边界

DOI:
10.1016/j.tecto.2012.03.005
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发表时间:
2012
期刊:
影响因子:
2.9
通讯作者:
--
中科院分区:
地球科学2区
文献类型:
--
作者:

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岩石圈板块的下边界一直是地震学家的一个谜,因为它是相对较差的地震手段观察。传统上有一个广泛的共识,即软流层是一个低速区,可观察到的地震面波。利用短周期P-S或S-P转换体波的地震技术,现在已发展到足以成功地以较高的分辨率观测这样的低速带。这种技术(所谓的接收函数技术)的原理是,从下面入射到台站下面的任何地震不连续面上的强地震母相(例如P、S、PP或SKS)产生转换相(Ps或Sp),该转换相指示其深度和性质。我们将讨论这项技术的细节。已经有足够数量的这样的观测结果表明,低速区的顶部是一个全球可观察到的不连续性,它比以前认为的更尖锐。一个有趣的观察结果是,在一些克拉通中,新的地震数据表明低速区已经存在于比从表面波获得的深度更浅的深度处。这证实了早先从受控源观测中得出的结果(Thybo和Perchuc,1997年)。我们讨论了可能的解释,这浅低速区在超声波区域。
The lower boundary of the lithospheric plates has remained as an enigmatic boundary for seismologists, since it is relatively poorly observed by seismic means. There is traditionally a broad consensus that the asthenosphere is observable as a low velocity zone by seismic surface waves. Seismic techniques which use shorter period P-to-S or S-to-P converted body waves are now far enough developed to be successful in observing such a low velocity zone with a higher resolution. The principle of this technique (the so-called receiver function technique) is that a strong teleseismic mother phase (e.g. P, S, PP or SKS) incident from below on any seismic discontinuity beneath a station produces a converted phase (Ps or Sp) which indicates its depth and properties. We discuss details of this technique. A sufficient number of such observations exist already to indicate that the top of the low velocity zone is a globally observable discontinuity and it is sharper than previously thought. An intriguing observation is that in some cratons the new seismic data indicate that the low velocity zone exists already at shallower depths than obtained from surface waves. This confirms earlier results from controlled source observations (Thybo and Perchuc, 1997). We discuss possible interpretations of this shallow low velocity zone in cratonic regions.
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发表时间: 2007
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