气候变化领域集成服务门户(CCPortal): Crustal and Upper-Mantle Structure Below Central and Southern Mexico

CCPortal

DOI	10.1029/2020JB020906
	Crustal and Upper-Mantle Structure Below Central and Southern Mexico
	Espindola-Carmona A.; Peter D.; Ortiz-Aleman C.
发表日期	2021
ISSN	21699313
卷号	126 期号:6
英文摘要	The Mexican subduction zone is a complex convergent margin characterized by a slab with an unusual morphology, an abnormal location of the volcanic arc, and the existence of slow earthquakes (slow slip events and tectonic tremors). The number of seismic imaging studies of the Mexican subduction zone has increased over the past decade. These studies have revealed the seismic wave velocity structure beneath Central and Southern Mexico. However, the existing tomographic models are either confined to specific areas or have coarse resolution. As a consequence, they do not capture the lateral and finer-scale variations in the mantle and the crust structure. Here, we fit frequency-dependent traveltime differences between observed and synthetic seismograms in a three-dimensional model of Central and Southern Mexico to constrain crustal and upper mantle seismic velocity structures jointly. We use ∼3,300 seismic records, filtered between 5 and 50 s, from 74 regional earthquakes. We perform point spread function tests to assess the resolution and trade-offs between model parameters. Our tomographic model reveals several seismic wave velocity features. These features include the geometry of the Cocos slab, the partial melting zone beneath the Trans-Mexican Volcanic Belt, and the Yucatan slab diving below Los Tuxtlas Volcanic Field that are consistent with previous studies. We also identify horizontal structures in the lower crust and the shallow upper mantle that were not previously identified. These structures include slow seismic wave velocity anomalies that may be correlated with ultraslow seismic velocity zones and high conductivity regions, where slow earthquakes have been identified. © 2021. American Geophysical Union. All Rights Reserved.
英文关键词	computational seismology; inverse theory; Mexico tomography; Middle American Trench; seismic tomography; Trans-Mexican Volcanic Belt
语种	英语
来源期刊	Journal of Geophysical Research: Solid Earth
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/187065
作者单位	King Abdullah University of Science and Technology (KAUST), Extreme Computing Research Center, Thuwal, Saudi Arabia; Centro Geo, Litoteca Nacional de Hidrocarburos, sede Yucatán, Parque Científico Tecnológico Yucatán (PCTY), Sierra Papacal, Mexico
推荐引用方式 GB/T 7714	Espindola-Carmona A.,Peter D.,Ortiz-Aleman C.. Crustal and Upper-Mantle Structure Below Central and Southern Mexico[J],2021,126(6).
APA	Espindola-Carmona A.,Peter D.,&Ortiz-Aleman C..(2021).Crustal and Upper-Mantle Structure Below Central and Southern Mexico.Journal of Geophysical Research: Solid Earth,126(6).
MLA	Espindola-Carmona A.,et al."Crustal and Upper-Mantle Structure Below Central and Southern Mexico".Journal of Geophysical Research: Solid Earth 126.6(2021).