We present an electrical resistivity model obtained from a 2D Magnetotelluric survey across a large sector of the Southern Apennine in the High Agri Valley (HAV), a NW-SE trending intra-mountain basin, with a high seismogenic potential. The intensive hydrocarbon exploitation (Val d'Agri oilfield) makes this area also affected by induced seismicity. In this HAV sector, the injection of salt-water in an unproductive disposal well (Costa Molina 2) causes localized swarms of microearthquakes; a second cluster of continuous induced seismicity is also observed SW of the Pertusillo Lake and it is associated to the seasonal fluctuations of the reservoir's water level.

The major insight inferred from this study concerns a better understanding of the geological and tectonic framework in the HAV. The electrical resistivity model images the subsurface as conductive sedimentary sequences (Allochthonous Units) upon the carbonate Apulian Platform Unit characterized by higher resistivity values. Both these units appear composed of thrust-and-fold system deepening with larger wavelength anticlines N-E toward. Most of the structures identified in the magnetotelluric model are rather superficial and confined within the Allochthonous Units. A sudden break of the Apulian platform under the central part of the MT profile defines a conductive zone possibly associated to a major SW-dipping reverse fault or to several branches, as closely spaced thrust-sheets cutting eastern flanks of the Agri Valley.

Additional information on the HAV deep structures comes from the joint interpretation of the resistivity model and a 3D seismic tomographic model obtained from the inversion of passive seismic data collected in the period 2002–2018. The availability of this elastic representation of the subsurface allowed us to perform a cluster analysis on the electrical resistivity and seismic P-wave velocity distribution within the subsoil. This joint quantitative interpretation unveiled new insights, otherwise hidden by individual models, on the subsurface structure distinguishing some rheological zones in terms of barriers and asperities.

我们提供了一个电阻率模型，该模型是通过2个大地电磁测量获得的，该测量跨越了高农业谷地（HAV）的南亚平宁山脉的大部分区域，该地区是西北向东南趋势的山内盆地，具有高地震成因。密集的碳氢化合物开采（Val d'Agri油田）使该地区也受到诱发地震活动的影响。在这种甲肝病毒领域，在非生产性处置井（Costa Molina 2）中注入盐水会引起局部微地震。在Pertusillo湖的西南偏南还观察到了第二类连续诱发地震活动，这与水库水位的季节性波动有关。

从这项研究中得出的主要见解涉及对HAV中的地质和构造框架有更好的理解。电阻率模型将碳酸盐阿普利安平台单元上的地下成像为导电沉积序列（异源单元），其特征在于电阻率值更高。这两个单元似乎都由推力和褶皱系统组成，并向更大的波长背斜线NE方向加深。大地电磁模型中识别出的大多数结构都相当肤浅，并局限在异源单元内。MT剖面中央部分下方的阿普利亚平台突然断裂，形成了一个导电带，可能与一个主要的西南俯冲逆断层或几个分支相关，这是由于紧密间隔的冲断层切割了阿格里河谷的东侧。

有关HAV深层结构的其他信息来自电阻率模型和3D地震层析成像模型的联合解释，该模型是从2002-2018年期间收集的被动地震数据反演获得的。地下这种弹性表示的可用性使我们能够对地下土壤中的电阻率和地震P波速度分布进行聚类分析。这种联合的定量解释揭示了新的见解，这些见解被单独的模型所掩盖，在地下结构上以障碍和凹凸不平区分了一些流变区。