Understanding the relationship between crustal faults and volcanic activity in transpressional environments is a main goal in geosciences and could help to understand geothermal resources and evaluate geological hazards. In the Andean Southern Volcanic Zone (SVZ), Chile, recorded seismicity is scarce, and few studies have evaluated the relationship between volcanic activity and crustal faults from seismic observations. Thus, in this study, we deployed a seismic network for almost 1 year to understand the brittle deformation of the upper crust within the Puyuhuapi area, located at ~44°S in the SVZ. We analyzed the location and kinematics of seismicity together with previously published field structural geological data. Considering these results, we developed an integrative tectonic model for the area and discussed which faults facilitate magma transport through the crust. Our results indicate the existence of two NNE‐oriented seismogenic dextral to dextral‐reverse regional faults that generate a duplex in a continental‐scale fault setting. Inside the duplex, we observed normal to strike‐slip normal focal mechanisms which recurrently have NE trending nodal planes. At a regional scale, a strike‐slip tectonic environment has a N60°E/18° shortening direction and a N151°E/03° extension direction. We conclude that stratovolcanoes are located inside the duplex in a local transtensional environment where NE oriented normal faulting may occur. These faults facilitate magma transport since they represent the preferential orientation for dilatational fractures. Conversely, in local transpressional environments such as the Puyuhuapi fault (NNE oriented dextral to dextral‐reverse kinematics), only minor eruptive centers of small volume are emplaced, suggesting a less productive magma transportation process.

中文翻译：

---

压转火山弧中的地震活动：智利安第斯山脉南部Puyuhuapi地区的Liquiñe-Ofqui断层系统（44°S）

理解地压环境中地壳断层与火山活动之间的关系是地球科学的主要目标，可以帮助理解地热资源和评估地质灾害。在智利的安第斯南部火山带（SVZ​​）中，记录的地震活动很稀少，并且很少有研究通过地震观测评估火山活动与地壳断层之间的关系。因此，在这项研究中，我们部署了将近1年的地震网络，以了解位于SVZ附近〜44°S的Puyuhuapi地区上地壳的脆性变形。我们分析了地震活动的位置和运动学，以及先前发表的野外构造地质数据。考虑到这些结果，我们开发了该地区的整体构造模型，并讨论了哪些断层有利于岩浆穿过地壳的运输。我们的结果表明，存在两个沿NNE定向的地震成因右旋向右旋反向区域性断裂，这些断裂在大陆性断裂环境中产生双相。在双体中，我们观察到法线到走滑法线聚焦机制，这些机制经常具有NE趋势的节点平面。在区域尺度上，走滑构造环境的收缩方向为N60°E / 18°，延伸方向为N151°E / 03°。我们得出的结论是，平流层火山位于局部超张性环境中的双相体内部，在该环境中可能会发生NE定向的正常断裂。这些断层有利于岩浆运移，因为它们代表了扩张性骨折的优先方向。反过来，