Study of the lithospheric and upper-mantle discontinuities beneath eastern Asia by SS precursors
Study of the lithospheric and upper-mantle discontinuities beneath eastern Asia by SS precursors
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SS前兆对东亚地区岩石圈和上地幔不连续面的研究
DOI：
10.1111/j.1365-246x.2010.04714.x
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发表时间：
2010
影响因子：
2.8
通讯作者：
J. Gossler
中科院分区：
文献类型：
--
作者：
X. Yuan;M. Bianchi;R. Kind;J. Gossler
本文分析了欧洲几个台网记录的主要震源在西太平洋的宽带SS波形资料，研究了东亚和西北太平洋岩石圈和上地幔中的地震SS波的底面反射，SS反射点采样了从阿留申、堪察加和日本俯冲带经华北造山带和中亚造山带到青藏高原的一条走廊。该走廊穿过不同的构造单元，如俯冲带、旧大陆盾、褶皱带和高原。我们研究了沿着剖面不同大地构造单元下岩石圈和地幔过渡带的地震结构，并推断了不同深度地球动力学过程的相关性。我们利用SS波形资料中的短周期频率成分，采用时差校正和共中心点叠加技术，获得了壳幔过渡带高横向和深度分辨率的剖面。410和660 km不连续面的清晰前兆显示了西北太平洋俯冲带下俯冲洋壳岩石圈与地幔过渡带相互作用的影响。在410公里的不连续面之下还发现了一个低速层，可沿着整个剖面追踪。由于本文提出的方法提高了分辨率，我们已经能够用SS前兆研究莫霍面和岩石圈-软流圈边界等较浅的结构。沿着这条走廊可以清楚地看到大陆莫霍面。深度变化与早期的接收函数结果一致。我们还看到负反射层沿着剖面在不同的深度，这可以解释为岩石圈-软流圈边界。
We analyse broad-bandSSwaveform data recorded by several networks in Europe with sources mainly in the west Pacific to study the underside reflections of teleseismicSSwaves in the lithosphere and the upper mantle beneath eastern Asia and the NW Pacific ocean.SSbounce points sample a corridor from the Aleutian, Kamchatka and Japan subduction zones through the North China Craton and Central Asian Orogenic Belt to the Tibetan plateau. The corridor passes through different tectonic units such as subduction zones, an old continental shield, a fold belt and a high plateau. We investigate the seismic structure of the lithosphere and the mantle transition zone beneath the different geotectonic units along the profile and infer the correlation of geodynamic processes at different depths. We explore the short period frequency content in theSSwaveform data and use moveout correction and common midpoint stack to acquire profiles with high lateral and depth resolution from the crust to the mantle transition zone. ClearSSprecursors of the 410 and 660 km discontinuities show the effects of the interaction between the subducted oceanic lithosphere and the mantle transition zone beneath the NW Pacific subduction zones. A low-velocity layer has also been detected beneath the 410 km discontinuity and can be traced along the entire profile. Due to the improved resolution acquired by the method presented here we have been able to study the shallower structures such as the Moho and the lithosphere–asthenosphere boundary bySSprecursors. The continental Moho can be clearly seen along this corridor. The depth variation agrees well with earlier receiver function results. We also see negative reflectors along the profile at varying depths, which can be interpreted as the lithosphere–asthenosphere boundary.
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DOI：
10.1186/bf03351801
发表时间：
2004-12
期刊：
Earth, Planets and Space
影响因子：
--
作者：
T. Tonegawa;K. Hirahara;T. Shibutani
通讯作者：
T. Tonegawa;K. Hirahara;T. Shibutani
影响因子：
2.3
作者：
Dapeng Zhao
通讯作者：
Dapeng Zhao
影响因子：
5.3
作者：
J. Gossler;R. Kind
通讯作者：
R. Kind
影响因子：
2.8
作者：
C. Rychert;P. Shearer
通讯作者：
C. Rychert;P. Shearer
来自底面反射数据的上地幔不连续地形的粗略误差
影响因子：
2.8
作者：
F. Neele;Han de Regt;John Van Decar
通讯作者：
John Van Decar