Imaging silicic systems using geophysics is challenging because many interrelated factors (e.g., temperature, melt fraction, melt composition, geometry) can contribute to the measured geophysical anomaly. Joint interpretation of models from multiple geophysical methods can better constrain interpretations of the subsurface structure. Previously published resistivity and shear wave velocity (Vs) models, derived separately from magnetotelluric (MT) and surface wave seismic data, respectively, have been used to model the restless Laguna del Maule Volcanic Field, central Chile. The Vs model contains a 450 km³ low‐velocity zone (LVZ) interpreted as a region with an average melt fraction of 5–6%. The resistivity model contains a conductor (C3) interpreted as a region with a melt fraction >35%. The spatial extents of the LVZ and C3 overlap, but the geometries and interpretations of these features are different. To resolve these discrepancies, this study investigates the resolution of the MT data using hypothesis testing and constrained MT inversions. It is shown that the MT data are best fit with discrete conductors embedded within the larger LVZ. The differences between the MT and seismic models reflect resolution differences between the two data sets as well as varying sensitivities to physical properties. The MT data are sensitive to smaller volumes of extractable mush that contain well‐connected crystal‐poor melt (C3). The seismic data have lower spatial resolution but image the full extent of the poorly connected crystal‐rich magma storage system. The combined images suggest that the LdMVF magma plumbing system is thermally heterogeneous with coexisting zones of warm and cold storage.

中文翻译：

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整合硅质岩浆系统的大地电磁和地震图像：以智利中部拉古纳德尔莫勒火山场为例

使用地球物理学对硅质系统进行成像具有挑战性，因为许多相互关联的因素（例如温度，熔体分数，熔体成分，几何形状）可能会导致所测得的地球物理异常。来自多种地球物理方法的模型的联合解释可以更好地约束对地下结构的解释。分别从大地电磁（MT）和表面波地震数据分别导出的先前发布的电阻率和剪切波速度（Vs）模型已用于对智利中部不安定的Laguna del Maule火山场进行建模。Vs模型包含450 km ³低速区（LVZ）解释为平均熔体分数为5–6％的区域。电阻率模型包含导体（C3），该导体被解释为熔体分数> 35％的区域。LVZ和C3的空间范围重叠，但是这些特征的几何形状和解释不同。为了解决这些差异，本研究使用假设检验和受约束的MT反演来研究MT数据的分辨率。结果表明，MT数据最适合嵌入较大LVZ中的离散导体。MT和地震模型之间的差异反映了两个数据集之间的分辨率差异以及对物理属性的敏感性变化。MT数据对包含结晶度较差的熔体（C3）的少量可提取糊状物敏感。地震数据具有较低的空间分辨率，但可以成像连接不良的富含晶体的岩浆存储系统的整个范围。合并的图像表明，LdMVF岩浆管道系统在热学和热库的共存区域是热非均质的。