Imaging the Moho and Subducted Oceanic Crust at the Isthmus of Tehuantepec, Mexico, from Receiver Functions
Imaging the Moho and Subducted Oceanic Crust at the Isthmus of Tehuantepec, Mexico, from Receiver Functions
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从接收器函数对墨西哥特万特佩克地峡的莫霍面和俯冲洋壳进行成像
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发表时间：
2011
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通讯作者：
X. Pérez‐Campos
中科院分区：
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作者：
D. Melgar;X. Pérez‐Campos
利用沿横跨墨西哥南部特万特佩克地峡的46个宽带台站的横断面(我们称之为VEOX(Veracruz-Oaxaca地震线))记录的远震数据，我们获得了接收函数，并将其叠加以研究莫霍面地形，并将它们反投影到地峡下的俯冲板块几何图形。我们观察到横跨断面的莫霍面厚度与方位角有关，特别是在洛斯塔斯特拉斯火山场下方。此外，我们还观察到科科斯板块在距离海沟140至310公里之间以26°的角度俯冲。与区域地震活动的对比表明，它发生在洋壳以下。
Using teleseismic data recorded along a transect, which we call VEOX (for Veracruz-Oaxaca seismic line), of 46 broadband stations installed across the Isthmus of Tehuantepec in southern Mexico, we obtained receiver functions and stacked them to study the Moho topography and back projected them to visualize the subducted slab geometry beneath the isthmus. We observed a back-azimuth dependent Moho thickness across the transect, particularly beneath the Los Tuxtlas Volcanic Field. Also, we observed the Cocos plate which subducts with an angle of 26° between 140 and 310 km from the trench. Comparison with regional seismicity indicates that it occurs below the oceanic crust.