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首页> 外文期刊>Research in Geophysics >Complex structure of the lithospheric slab beneath the Banda arc, eastern Indonesia depicted by a seismic tomographic model
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Complex structure of the lithospheric slab beneath the Banda arc, eastern Indonesia depicted by a seismic tomographic model

机译：地震层析成像模型描绘的印度尼西亚东部班达弧以下岩石圈平板的复杂结构

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Seismic tomography with a non-linear approach has been successfully applied to image the P-wave velocity structure beneath the Banda arc in detail. Nearly one million compressional phases including the surfacereflected depth phases pP and pwP from events within the Indonesian region have been used. The depth phases have been incorporated in order to improve the sampling of the uppermantle structure, particularly below the Banda Sea in the back-arc regions. For the model parameterization, we have combined a highresolution regional inversion with a low-resolution global inversion to allow detailed images of slab structures within the study region and to minimize the mapping of distant aspherical mantle structure into the volume under study. In this paper, we focus our discussion on the upper mantle and transition zone structure beneath the curved Banda arc. The tomographic images confirm previous observations of the twisting of the slab in the upper mantle, forming a spoon-shaped structure beneath the Banda arc. A slab lying flat on the 660 km discontinuity beneath the Banda Sea is also well imaged. Further interpretations of the resulting tomograms and seismicity data support the scenario of the Banda arc subduction rollback.
机译：采用非线性方法的地震层析成像已成功地应用于对Banda弧下方的P波速度结构进行详细成像。已经使用了近一百万个压缩相，包括来自印尼地区内部事件的表面反射深度相pP和pwP。为了改善对上地幔结构的采样，特别是在后弧区域的班达海以下，已经纳入了深度阶段。对于模型参数化，我们将高分辨率的区域反演与低分辨率的整体反演相结合，以使研究区域内的板状结构具有详细的图像，并使远距离非球面地幔结构映射到正在研究的体积中。在本文中，我们将讨论重点放在弯曲的Banda弧下方的上地幔和过渡带结构上。断层图像证实了先前观察到的上地幔板的扭曲，在班达弧线下方形成了勺形结构。在班达海下方660公里不连续处的一块平板也被很好地成像。对生成的层析X射线照片和地震活动性数据的进一步解释支持Banda弧俯冲回滚的情况。

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