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首页> 外文期刊>Journal of Volcanology and Geothermal Research >Conductivity distribution beneath Lascar volcano (Northern Chile) and the Puna,inferred from magnetotelluric data
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Conductivity distribution beneath Lascar volcano (Northern Chile) and the Puna,inferred from magnetotelluric data

机译：根据大地电磁数据推断，拉斯卡尔火山（智利北部）和普纳火山下的电导率分布

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摘要

During two field campaigns in 2007 and 2010, long-period and broadband magnetotelluric measurements were conducted in the Central Andes of northern Chile and northwestern Argentina at a latitude of 23.7°S. The study area spans from the Precordillera over the active volcanic arc of the Western Cordillera until the western part of the Puna. A special focus was on Lascar, a subduction related stratovolcano with an historical activity characterized by fumarolic emissions and occasional sub-plinian eruptions, like the one occurred on 1993. The broadband instruments, covering a period range between T = 0.005 s and 1000 s, were installed in the proximities of Lascar volcano, while the long-period devices (T= 10 s-10,000 s) were installed on a profile slightly south of Lascar, crossing the Salar de Atacama basin, the volcanic arc and reaching the western border of the Puna. Remote reference and robust techniques were used for data processing. Induction vectors, phase tensor ellipses and strike direction of the conductivity distribution were calculated, showing some 3-D behavior for the Lascar sites at shallower depths, with induction vectors close to the edifice influenced partially by the topography. 3-D modeling and inversion revealed conductive anomalies beneath Lascar volcano, but also beneath the Puntas Negras volcanic chain. For the long-period transect, the behavior is closer to a 2-D case, with more stable strike direction coherent with induction vectors and phase tensor ellipses. The major result of 2-D inversion is a vast high-conductivity zone in the backarc crust, which seems to be the southern extension of a large highly conductive anomaly observed in prior studies beneath the Altiplano.
机译：在2007年和2010年的两次野战中，在智利北部安第斯中部和阿根廷西北部纬度23.7°进行了长期和宽带大地电磁测量。研究范围从西部山脉的活跃火山弧上的Precordillera到Puna的西部。特别关注的是Lascar，这是一种俯冲相关的平流火山，其历史活动具有富马尾气排放和偶发的次普林山喷发的特征，就像1993年发生的那样。宽带仪器的时间范围在T = 0.005 s和1000 s之间，安装在Lascar火山附近，而长周期装置（T = 10 s-10,000 s）安装在Lascar稍微偏南的剖面上，穿过Salar de Atacama盆地，火山弧并到达拉萨火山的西边界普那远程参考和健壮的技术被用于数据处理。计算了感应矢量，相位张量椭圆和电导率分布的走向，显示了在较浅深度的Lascar站点的某些3-D行为，靠近建筑物的感应矢量部分受到了地形的影响。 3-D建模和反演揭示了Lascar火山下方以及蓬塔斯内格拉斯火山链下方的导电异常。对于长周期样线，其行为更接近于2D情况，其打击方向与感应矢量和相量张量椭圆相一致，具有更稳定的走向。二维反演的主要结果是在后弧地壳中形成了一个巨大的高电导带，这似乎是先前在Altiplano下进行的一项研究中观察到的一个大型高电导异常的南延。

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