The Delhi Seismic Zone (DSZ) is a seismically highly active intraplate region that keeps experiencing recurrent seismicity of minor to moderate nature. The seismic activity in the DSZ in recent times has evoked concerns about the vulnerability of the region due to potential earthquakes. Although the spatial distribution of recorded earthquakes gives a fairly good idea about the zone of the seismicity, the information about the underlying crustal structure and seismogenic faults is largely missing. In the present work, we have revisited the MT data acquired at various locations across Haryana to understand whether there are any anomalous features in the crust that might correlate with the seismicity in the western part of the DSZ. The MT data recorded at six groups of sites yielded good impedance tensors in the period range of 0.001–1000 s. A significant result obtained by 2-D inversion of distortion corrected impedance tensors is the presence of a northward dipping electrical conductor (<10 Ωm) from the surface down to about 20–25 km depth. The surface location of this conductor is in the proximity of the northern edge of the inferred Delhi–Sargodha Ridge. The DSZ earthquakes, when projected onto the MT profile, coincide with the north dipping conductor. We infer that the conductor is possibly extending into the DSZ and has an important role in the occurrence of the seismicity, at least in the western part of the region and that the increased electrical conductivity is possibly due to the presence of crustal fluids.

德里地震区（DSZ）是地震活跃的板内区域，不断经历着中小度的反复地震活动。DSZ最近的地震活动引起了人们对该地区由于潜在地震而易受伤害的担忧。尽管记录的地震的空间分布对地震活动的区域有一个很好的了解，但有关底层地壳结构和地震成因的断层信息却很缺乏。在目前的工作中，我们重新研究了在哈里亚纳邦各地获取的MT数据，以了解地壳中是否存在任何异常特征，这些异常特征可能与DSZ西部地区的地震活动有关。在六组地点记录的MT数据在0.001-1000 s的时间范围内产生了良好的阻抗张量。通过对失真校正后的阻抗张量进行二维反转获得的显着结果是，存在一个从表面向下至约20-25 km深度的向北浸入的电导体（<10Ωm）。该导体的表面位置在推测的德里–Sargodha山脊的北边缘附近。当投影到MT剖面上时，DSZ地震与北倾导体重合。我们推断，导体可能延伸到DSZ中，并且至少在该区域的西部地区，在地震活动的发生中具有重要作用，并且电导率的提高可能是由于地壳流体的存在。10Ωm）从表面向下到约20–25 km的深度。该导体的表面位置在推测的德里–Sargodha山脊的北边缘附近。当投影到MT剖面上时，DSZ地震与北倾导体重合。我们推断，导体可能延伸到DSZ中，并且至少在该区域的西部地区，在地震活动的发生中具有重要作用，并且电导率的提高可能是由于地壳流体的存在。10Ωm）从表面向下到约20–25 km的深度。该导体的表面位置在推测的德里–Sargodha山脊的北边缘附近。当投影到MT剖面上时，DSZ地震与北倾导体重合。我们推断，导体可能延伸到DSZ中，并且至少在该区域的西部地区，在地震活动的发生中具有重要作用，并且电导率的提高可能是由于地壳流体的存在。