Waveform inversion of the S reflector west of Spain: Fine structure of a detachment fault
Waveform inversion of the S reflector west of Spain: Fine structure of a detachment fault
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西班牙西部S反射层波形反演：滑脱断层的精细结构
DOI：
10.1029/2005gl024026
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发表时间：
2005
影响因子：
5.2
通讯作者：
T. Minshull
中科院分区：
文献类型：
--
作者：
T. Leythaeuser;T. Reston;T. Minshull
伊比利亚以西的 S 反射被解释为将地壳断块与部分蛇纹化地幔分开的低角度滑脱断层。我们应用全波形反演来研究 S 的精细结构。我们的结果证实，S 很大程度上是速度（和密度）的逐步增加，可能是从地壳岩石到部分蛇纹化的地幔橄榄岩。 S上方约50 m厚的低速带可能代表主断层带，由高度蛇纹石化的橄榄岩或主断层带上方的水力压裂和蚀变地壳岩石组成。两种解释都意味着流体沿着 S 方向集中流动，从而提高了局部瞬态高流体压力的发展有助于沿着 S 方向低角度运动的可能性。
The S reflection west of Iberia has been interpreted as a low‐angle detachment fault separating crustal fault blocks from partially serpentinized mantle. We apply full waveform inversion to investigate the fine structure of S. Our results confirm that S is largely a step increase in velocity (and density), probably from crustal rocks to partially serpentinized mantle peridotites. A ∼50 m thick low velocity zone above S might represent a main fault zone of highly serpentinized peridotites or hydrofractured and altered crustal rocks above the main fault zone. Both interpretations imply focused fluid flow along S, raising the possibility that low‐angle movement along S was aided by the development of local, transient high fluid pressures.