Generating High-Fidelity Reflection Images Directly From Full-Waveform Inversion: Hikurangi Subduction Zone Case Study
Generating High-Fidelity Reflection Images Directly From Full-Waveform Inversion: Hikurangi Subduction Zone Case Study
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直接从全波形反演生成高保真反射图像：Hikurangi 俯冲带案例研究
DOI：
10.1029/2021gl094981
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发表时间：
2021
影响因子：
5.2
通讯作者：
Davy R
中科院分区：
文献类型：
--
作者：
Davy R
全波形反演（FWI）可以将地下物理特性解析到高分辨率，但高性能计算资源直到最近才使高频反演变得实用。高频FWI的一个好处是可以在空间中区分恢复的速度模型，以生成与传统反射图像分辨率相当的高质量深度图像（FWI图像）。在这里，我们演示了直接从FWI过程生成高保真反射图像。我们应用FWI高达38赫兹的地震数据在希库朗吉俯冲边缘。由此产生的速度模型和FWI图像揭示了一个复杂的断层系统，沉积物变形，和底部模拟反射浅加积棱镜。我们的FWI图像与常规反射图像一致，并且更好地解决了Pāpaku逆冲断层周围的层位。因此，FWI成像有可能取代传统的反射成像，同时也提供物理属性模型，协助地质解释。
Full‐waveform inversion (FWI) can resolve subsurface physical properties to high resolutions, yet high‐performance computing resources have only recently made it practical to invert for high frequencies. A benefit of high‐frequency FWI is that recovered velocity models can be differentiated in space to produce high‐quality depth images (FWI images) of a comparable resolution to conventional reflection images.Here, we demonstrate the generation of high‐fidelity reflection images directly from the FWI process. We applied FWI up to 38 Hz to seismic data across the Hikurangi subduction margin. The resulting velocity models and FWI images reveal a complex faulting system, sediment deformation, and bottom‐simulating reflectors within the shallow accretionary prism. Our FWI images agree with conventional reflection images and better resolve horizons around the Pāpaku thrust fault. Thus, FWI imaging has the potential to replace conventional reflection imaging whilst also providing physical property models that assist geological interpretations.