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- W2161750215 abstract "Abstract Southwestern Mexico is a region of complex active tectonics with subduction of the young Rivera and Cocos plates to the south and widespread magmatism and rifting in the continental interior. Here we use receiver function analysis on data recorded by a 50 station temporary deployment of seismometers known as the MARS (MApping the Rivera Subduction zone) array to investigate crustal structure as well as the nature of the subduction interface near the coast. The array was deployed in the Mexican states of Jalisco, Colima, and Michoacan. Crustal thickness varies from 20 km near the coast to 42 km in the continental interior. The Rivera plate has steeper dip than the Cocos plate and is also deeper along the coast than previous estimates have shown. Inland, there is not a correlation between the thickness of the crust and topography indicating that the high topography in northern Jalisco and Michoacan is likely supported by buoyant mantle. High crustal V p / V s ratios (greater than 1.82) are found beneath the trenchward edge of magmatism including below the Central Jalisco Volcanic Lineament and the Michoacan‐Guanajuato Volcanic Field implying a new arc is forming closer to the trench than the Trans Mexican Volcanic Belt. Elsewhere in the region, crustal V p / V s ratios are normal. The subducting Rivera and Cocos plates are marked by a dipping shear wave low‐velocity layer. We estimate the thickness of the low‐velocity layer to be 3 to 4 km with an unusually high V p / V s ratio of 2.0 to 2.1 and a drop in S velocity of 25%. We postulate that the low‐velocity zone is the upper oceanic crust with high pore pressures. The low‐velocity zone ends from 45 to 50 km depth and likely marks the basalt to eclogite transition." @default.
- W2161750215 created "2016-06-24" @default.
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- W2161750215 date "2015-02-01" @default.
- W2161750215 modified "2023-10-09" @default.
- W2161750215 title "Crust and subduction zone structure of Southwestern Mexico" @default.
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- W2161750215 doi "https://doi.org/10.1002/2014jb011573" @default.
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