The Krafla volcano-geothermal area is located in Northeast Iceland, within the active Northern Volcanic Zone sector of the axial rift and has experienced two eruptions in historical times. The Krafla system displays NNE-SSW oriented fissure swarm, a central volcano and associated geothermal manifestations (i.e. steam and gas emissions, hydrothermal alterations). However, during its exploration and exploitation, several geophysical indications have suggested the occurrence of WNW-ESE trending structures, i.e. near orthogonal with respect to the faults delimiting the axial rift. This paper describes the results of a structural survey carried out in a wide area in the NE-sector of Iceland along the Húsavík-Flatey shear zone and in the Krafla area, measuring fractures and alignments of geothermal manifestations and fissure swarms. The dataset highlights the occurrence of structures oriented in two main trends, i.e. NNW-SSE to NNE-SSW and WNW-ESE. At their intersection, geothermal manifestations and silica sinter deposits commonly occur. Both of these trends have been documented in the Krafla geothermal area and compared with borehole and geophysical data. Our conclusions support that the location of the high-temperature Krafla geothermal area is mainly controlled by the enhanced permeability at the intersection between structures of the axial rift zone and incipient transform faults crossing the Krafla area.

克拉夫拉火山地热区位于冰岛东北部，在轴向裂谷活跃的北部火山区范围内，在历史上曾经历过两次喷发。Krafla系统显示NNE-SSW定向裂隙群，中央火山和相关的地热表现（即蒸汽和气体排放，热液蚀变）。但是，在勘探和开发过程中，一些地球物理指示表明存在WNW-ESE趋势结构，即相对于界定轴向裂谷的断层接近正交。本文介绍了在冰岛东北地区沿Húsavík-Flatey剪切带和Krafla地区进行的结构性调查的结果，该调查测量了地热表现形式和裂变群的裂缝和走向。数据集突出显示了面向两个主要趋势的结构的发生，即从NNW-SSE到NNE-SSW和WNW-ESE。在它们的交点处，通常会出现地热表现和二氧化硅烧结矿沉积物。这两种趋势在克拉夫拉地热地区都有记载，并与钻孔和地球物理数据进行了比较。我们的结论支持，高温克拉夫拉地热区的位置主要受轴向裂谷带结构与跨越克拉夫拉区的初始转换断层之间相交处渗透率提高的控制。这两种趋势在克拉夫拉地热地区都有记载，并与钻孔和地球物理数据进行了比较。我们的结论支持，高温克拉夫拉地热区的位置主要受轴向裂谷带结构与跨越克拉夫拉区的初始转换断层之间相交处渗透率提高的控制。这两种趋势在克拉夫拉地热地区都有记载，并与钻孔和地球物理数据进行了比较。我们的结论支持，高温克拉夫拉地热区的位置主要受轴向裂谷带结构与跨越克拉夫拉区的初始转换断层之间相交处渗透率提高的控制。