Crustal imaging of western Michoacán and the Jalisco Block, Mexico, from Ambient Seismic Noise

Detailed crustal imaging of western Michoacán and the Jalisco Block is obtained from ambient noise tomography. Results show a deep and well-delineated volcanic system below the Colima volcano complex, rooting up to ~22km depth, with a shallow magmatic chamber constrained to the first ~7km. A shallow...

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Bibliographic Details
Published in:Journal of volcanology and geothermal research 2014-12, Vol.289, p.193-201
Main Authors: Spica, Zack, Cruz-Atienza, Víctor M., Reyes-Alfaro, Gabriel, Legrand, Denis, Iglesias, Arturo
Format: Article
Language:English
Subjects:
Ambient noise
Blocking
Colima volcano
Crystalline rocks
Earth sciences
Earth, ocean, space
Exact sciences and technology
Igneous and metamorphic rocks petrology, volcanic processes, magmas
Imaging
Magma reservoirs
Mantle
Marine
Noise
Rivera-Cocos plates
Strikes
Tomography
Volcanic activity
Volcanoes
Volcanology
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Summary:Detailed crustal imaging of western Michoacán and the Jalisco Block is obtained from ambient noise tomography. Results show a deep and well-delineated volcanic system below the Colima volcano complex, rooting up to ~22km depth, with a shallow magmatic chamber constrained to the first ~7km. A shallow low-velocity system to the south of the Chapala rift and west of the Michoacán-Guanajuato volcanic field merges, underneath the Colima rift, with the Colima volcano system at about 20km depth, honoring the geometry of the Trans-Mexican Volcanic Belt. For depths greater than ~30km, low-velocity features become parallel to the slab strike, right beneath the Mascota, Ayutla and Tapalpa volcanic fields, suggesting the presence of the mantle wedge above the Rivera plate. All mentioned low-velocity bodies are spatially correlated with the superficial volcanic activity suggesting their magmatic origin so that, the shallower these bodies, the younger are the associated volcanic deposits. Along the coast, different depths of the uppermost layer of the Rivera and the Cocos plates suggest that the latter plate subducts with an angle ~9° steeper than the former. •High-resolution imaging of the Colima volcano magmatic system.•Slab tear between the Rivera and Cocos plates.•Deep magma reservoirs correlated with superficial volcanism.
ISSN:0377-0273
1872-6097
DOI:10.1016/j.jvolgeores.2014.11.005