دورية أكاديمية
Structural Characterization of the Taltal Segment in Northern Chile Between 22°S and 26°S Using Local Earthquake Tomography
| العنوان: | Structural Characterization of the Taltal Segment in Northern Chile Between 22°S and 26°S Using Local Earthquake Tomography |
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| المؤلفون: | Sergio Leon‐Rios, Valentina Reyes‐Wagner, Daniela Calle‐Gardella, Andreas Rietbrock, Steven Roecker, Andrei Maksymowicz, Diana Comte |
| المصدر: | Geochemistry, Geophysics, Geosystems, Vol 25, Iss 5, Pp n/a-n/a (2024) |
| بيانات النشر: | Wiley, 2024. |
| سنة النشر: | 2024 |
| المجموعة: | LCC:Geophysics. Cosmic physics LCC:Geology |
| مصطلحات موضوعية: | northern Chile, 3D velocity models, tectonic processes, local earthquake tomography, seismic catalog, continental forearc, Geophysics. Cosmic physics, QC801-809, Geology, QE1-996.5 |
| الوصف: | Abstract Recordings of earthquakes by a temporary deployment of 84 short period seismometers in northern Chile were used to derive regional 3D seismic velocity models for the Taltal segment. We used the Regressive ESTimator (REST) package for event detection and automatic onset estimation of P‐ and S‐wave arrival times to create an earthquake catalog with 23,985 hypocenters. We followed standard acceptability criteria (i.e., azimuthal gap and residual cutoff) to create a high‐quality data set and inverted for 3D Vp, Vs and Vp/Vs models using local earthquake tomography. Plots of hypocenters from the catalog, comprising 16,349 earthquakes, reveal active structures in the upper crust, dip changes along the slab and fracturing within the oceanic crust. Moreover, the wavespeed models illuminate anomalies in both the Nazca and South American plates that correlate with the observed seismicity distribution, including variations from low (1.75) to high (>1.80) Vp/Vs near the Atacama fault system on the coastline and the Domeyko Fault System in the forearc. The seismic velocity models also provide evidence for fluid circulation caused by the subducting Taltal ridge on the coast and partial melting feeding a volcanic complex close to the Andes. Finally, the observed low Vp/Vs ratios (∼1.75) are associated with copper mining operations in the area, suggesting that this kind of imaging can be used to characterize the distribution of potential ore deposits in the area. |
| نوع الوثيقة: | article |
| وصف الملف: | electronic resource |
| اللغة: | English |
| تدمد: | 1525-2027 |
| Relation: | https://doaj.org/toc/1525-2027 |
| DOI: | 10.1029/2023GC011197 |
| URL الوصول: | https://doaj.org/article/ae202891dd244ff981699f95ac05e2ad |
| رقم الأكسشن: | edsdoj.202891dd244ff981699f95ac05e2ad |
| قاعدة البيانات: | Directory of Open Access Journals |
Full Text Finder | تدمد: | 15252027 |
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| DOI: | 10.1029/2023GC011197 |