Fluid composition and distribution, the key factors determining geoelectric structure in a seismically active region, are controlled by local and regional stresses and rheological contrasts. Two closely located magnetotelluric and seismic velocity profiles are jointly interpreted to recover more accurately the structural boundaries and fluid distribution within the crust in the central Zagros collision zone, one of the world’s most seismically active mountain belt. A multi-site and multi-frequency approach was used for the strike analysis of regional structure and decomposition of distortion effects on magnetotelluric data. Distortion corrected magnetotelluric data were then used for two-dimensional inversion modeling. The results indicate distinct conductive structures within the crust: (i) a thick conductive overburden in the southwest of the profile, (ii) high conductivities attributed to the fault zone conductors (FZCs) and (iii) an almost concave conductor extending from middle to lower crust in the central-eastern portion of the mountain belt, beneath the High Zagros (HZ). Comparison with the already available S-wave velocity structure, obtained by joint inversion of P-wave receiver functions and surface wave dispersion data shows that these main conductive features are spatially correlated with a low-velocity layer representative of the sedimentary cover overlying the Arabian platform and a velocity contrast bounded by the main Zagros thrust (MZT) fault, indicating the presence of fault zone fluids. The joint interpretation of magnetotelluric inverse modeling and seismicity data also shed light on fluid generation influencing rock deformation and seismicity in this region. It suggests that beneath the HZ, deep crustal fluids generated through metamorphism may promote aseismic deformations before high stresses are builtup and cause the north-eastern part of the Zagros Fold and Thrust Belt (ZFTB) to be seismically inactive compared to its southwestern part.

流体成分和分布是决定地震活跃区域中地电结构的关键因素，受局部和区域应力以及流变学对比的控制。联合解释了两个位置紧密的大地电磁和地震速度剖面，以更准确地恢复扎格罗斯中部碰撞带（世界上地震活动最活跃的山区之一）中地壳内的结构边界和流体分布。多站点和多频率方法用于区域结构的走向分析和对大地电磁数据的失真影响的分解。畸变校正的大地电磁数据随后用于二维反演建模。结果表明，地壳内有明显的导电结构：（i）剖面西南部的厚导电覆盖层，（ii）归因于断层带导体（FZCs）的高电导率，以及（iii）从中部到下部地壳在中部东部延伸的几乎呈凹形的导体高山带，位于高扎格罗斯（HZ）下。通过对P波接收器函数和表面波频散数据进行联合反演获得的S波速度结构的比较表明，这些主要的导电特征在空间上与代表阿拉伯平台上沉积覆盖层的低速层相关速度反差以主要Zagros推力（MZT）断层为界，表明存在断层带流体。大地电磁反演模型和地震数据的联合解释也为影响该地区岩石变形和地震活动的流体生成提供了启示。这表明，在HZ之下，通过变质作用生成的深层地壳流体可能在高应力形成之前促进了地震变形，并导致Zagros褶皱和冲断带（ZFTB）的东北部与其西南部相比没有地震活动。