Modelling regional-scale attenuation of seismic waves at ~1 Hz is challenging, especially when these waves propagate across both continental and oceanic crust. Recent developments in seismic imaging and modelling have provided us with the computational tools necessary to reconstruct these mixed settings using deterministic (coherent) and stochastic (coda) information. Here, we present new tomographic maps of coda-attenuation for both the Italian peninsula and the Tyrrhenian Sea. Kernel-based coda attenuation imaging in the diffusive approximation is tested in the oceanic environment, highlighting a non-diffusive behaviour across the Southern Tyrrhenian Sea. Joint deterministic and Radiative Transfer forward modelling of coherent and scattered waves (Radiative3D) is then performed for the portion of this area showing the lowest coda attenuation. The corresponding parametric study shows that coda attenuation is an efficient marker of variations of Moho depths and crustal reverberations, such as those we observe in a transitional area (characterized by continental crust and thicker Moho) between two oceanic basins (Vavilov and Marsili). Diffusive tomographic imaging informed by Radiative3D modelling reconstructs high-attenuation patterns along the Italian peninsula in agreement with the thick sediments cover across the Po Plain and the Adriatic coast and the magmatic systems in the Central Campanian province. A combined approach of coda-attenuation imaging and modelling can constrain Moho depth and spatial variations of seismic attenuation at regional scale and in mixed continental-oceanic settings.

模拟约 1 Hz 地震波的区域尺度衰减具有挑战性，尤其是当这些波在大陆和海洋地壳中传播时。地震成像和建模的最新发展为我们提供了使用确定性（相干）和随机（尾声）信息重建这些混合环境所需的计算工具。在这里，我们展示了意大利半岛和第勒尼安海的尾声衰减的新断层扫描图。在海洋环境中测试了扩散近似中基于核的尾声衰减成像，突出了整个南第勒尼安海的非扩散行为。然后对该区域显示最低尾波衰减的部分执行相干波和散射波 (Radiative3D) 的联合确定性和辐射传递正向建模。相应的参数研究表明，尾波衰减是莫霍面深度和地壳回响变化的有效标志，例如我们在两个大洋盆地（瓦维洛夫和马西里）之间的过渡区（以大陆地壳和较厚的莫霍面为特征）观察到的那些。由 Radiative3D 建模提供的漫射断层成像重建了意大利半岛沿线的高衰减模式，与波平原和亚得里亚海沿岸的厚沉积物覆盖以及中央坎帕尼亚省的岩浆系统一致。尾波衰减成像和建模的组合方法可以限制区域尺度和大陆-海洋混合环境中地震衰减的莫霍面深度和空间变化。