Abstract Popocatepetl volcano located in central Mexico has been erupting since December 1994 and since then many studies have been carried out in order to understand its eruptive behavior and assess the volcanic hazard since more than 25 million people are at risk. Nevertheless, few geophysical studies have been conducted in order to image the structure of the volcano. For this reason, we carried out magnetotelluric and gravity surveys on the northern flank of the volcano and also modeled magnetic data for the area. In this paper we provide new insight into the structure of the northern part of this complex volcanic structure, which is made up of several volcanoes that had been camouflaged by later pyroclastic deposits from recent eruptions. Results show major northwest-and northeast trending faults in the area that displaced blocks toward the south. These scarps are related to sector collapses. The oldest part of the complex, the Tlamacas volcano was identified by the discontinuities inferred from gravity, magnetic and magnetotelluric data. Electrical resistivity distribution also shows the existence of a lack of continuity in a conductive horizon on the eastern side of the prospected area, which coincides with the location of the hypocenter of the May 6, 2013 earthquake. This feature also corresponds to the position of Tlamacas Volcano and its late dome, that is also faulted, confirming that the NE-SW trending fault is still active. Faulting inferred from geophysical data and confirmed by the occurrence of earthquakes and vent alignment suggests the structural control on magma ascent and the weakness of the southeastern flank of the volcano.

中文翻译：

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解开波波卡特佩特火山（墨西哥中部）的复杂结构：从地球物理数据推断的坍塌特征和活动断层的新证据

摘要 位于墨西哥中部的波波卡特佩特火山自 1994 年 12 月以来一直喷发，从那时起，由于超过 2500 万人处于危险之中，为了了解其喷发行为和评估火山危害，进行了许多研究。然而，很少进行地球物理研究来对火山结构进行成像。出于这个原因，我们在火山的北翼进行了大地电磁和重力调查，并对该地区的磁数据进行了建模。在本文中，我们提供了对该复杂火山结构北部结构的新见解，该结构由几座火山组成，这些火山被最近爆发的火山碎屑沉积物所掩盖。结果显示该地区主要的西北和东北向断层使地块向南移动。这些悬崖与行业崩溃有关。特拉马卡斯火山是该综合体最古老的部分，通过重力、磁力和大地电磁数据推断出的不连续性来确定。电阻率分布还表明，勘探区域东侧的导电层缺乏连续性，这与 2013 年 5 月 6 日地震的震源位置重合。这一特征也对应于特拉马卡斯火山及其晚穹窿的位置，也发生断层，证实NE-SW向断层仍然活动。