Evidence of recent ruptures in the central faults of the Acambay Graben (central Mexico)
| Autor: | Pierre Lacan, Ramón Zúñiga, Petra Štěpančíková, Gerardo J. Aguirre-Díaz, María Ortuño, María Teresa Ramírez-Herrera, Héctor Perea, Ona Corominas, Pilar Villamor |
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| Přispěvatelé: | Universidad Nacional Autónoma de México, Consejo Nacional de Ciencia y Tecnología (México), Czech Science Foundation, Ministry of Business, Innovation, and Employment (New Zealand) |
| Rok vydání: | 2019 |
| Předmět: |
010504 meteorology & atmospheric sciences
Paleoseismology Tepuxtepec fault system Slip (materials science) 010502 geochemistry & geophysics Fault scarp 01 natural sciences Echelon formation Mèxic Mexico Seismology 0105 earth and related environmental sciences Earth-Surface Processes geography geography.geographical_feature_category Temascalcingo fault system Volcanic belt Graben Fault complexity Falles (Geologia) Volcano Faults (Geology) Quaternary Sismologia Geology |
| Zdroj: | Dipòsit Digital de la UB Universidad de Barcelona Digital.CSIC. Repositorio Institucional del CSIC instname |
| Popis: | Special issue Palaeoseismology and Active Faults.-- 21 pages, 14 figures, 4 tables, supplementary data https://doi.org/10.1016/j.geomorph.2018.07.010 The Acambay Graben, within the central part of the Trans-Mexican Volcanic Belt, is one of the major sources of continental earthquakes in Mexico. To date, the activity and paleoseismological history of the axial faults of the graben are not well constrained. We provide morphological, structural and sedimentological evidence of the seismogenic nature of two of the axial structures, the Temascalcingo and the Tepuxtepec fault systems. Faults consist of multiple parallel scarps with en echelon and horse-splay patterns. Fault systems extend for 60 km and displace Quaternary to Upper Miocene volcanic edifices and volcano-sedimentary materials. Surface lengths of individual fault traces range between 3 and 25 km, and observed throws reach a minimum of 150–200 m. The long-term and short-term slip rate of the Temascalcingo fault system in the studied section presents similar values, ranging from 0.06 ± 0.02 (minimum long term) to 0.12 ± 0.02 mm y (maximum value of average short-term). Only the long-term slip rate of the Tepuxtepec system could be constrained in 0.01–0.02 mm/y, being a minimum estimate. The Holocene fault rupture history at two sites provided evidence of six ruptures since 12,500–11,195 BCE, among which three ruptures should have occurred between 11,847 ± 652 BCE and 11,425 ± 465 BCE Variable single event displacements (SEDs, between 6 and 77) are interpreted as the result of fault interdependences and/or the interaction with the latest volcanic activity. Also, small displacements triggered by activity on other faults probably contributed to slip variability, i.e., faults display primary and secondary behavior This study was supported by the Universidad Nacional Autonoma de Mexico (PAPIIT grants IA101615, IA102317, IN-104615 and IN112110) and by Consejo Nacional de Ciencia y Tecnología (CONACyT, Mexico) grant CB-2009-01-129010. Petra Štěpančíková was supported by the Czech Science Foundation Project Number 205/08/P521 and P210/12/0573 and the long-term conceptual development research organization RVO: 67985891. Pilar Villamor was support by New Zealand Ministry of Business, Innovation and Employment (Strategic Science Investment Fund) |
| Databáze: | OpenAIRE |
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