Active 650-km Long Fault System and Xolapa Sliver in Southern Mexico
| Autor: | Krzysztof Gaidzik, Vladimir Kostoglodov, N. Cotte, A. Walpersdorf, María Teresa Ramírez-Herrera, Allen Husker, Ekaterina Kazachkina, José Antonio Santiago |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
geography
geography.geographical_feature_category 010504 meteorology & atmospheric sciences Volcanic belt GPS oblique subduction Terrain sliver motion Fault (geology) fault system 010502 geochemistry & geophysics 01 natural sciences Tectonics earthquake slip Sinistral and dextral Trench General Earth and Planetary Sciences tectonics lcsh:Q Shear zone lcsh:Science Forearc Geology Seismology 0105 earth and related environmental sciences |
| Zdroj: | Frontiers in Earth Science, Vol 8 (2020) |
| ISSN: | 2296-6463 |
| DOI: | 10.3389/feart.2020.00155/full |
| Popis: | New estimates of long-term velocities of permanent GPS stations in Southern Mexico reveal that the geologically discernible ∼650-km long shear zone, which strikes parallel to the Middle America trench, is active. This left-lateral strike-slip, La Venta–Chacalapa (LVC) fault system, is apparently associated with a motion of the Xolapa terrain and at the present time is the northern boundary of a ∼110–160-km wide forearc sliver with a sinistral motion of 3–6 mm/year with respect to the North America plate. This sliver is the major tectonic feature in the Guerrero and Oaxaca regions, which accommodates most of the oblique component of the convergence between the Cocos and North America plates. Previous studies based purely on the moment tensor coseismic slips exceedingly overestimated the sliver inland extent and allocated its northern margin on or to the north of the Trans-Mexican Volcanic Belt. While the LVC fault system probably slips slowly over geologic scale time and there is not any historic evidence of large earthquakes on the fault so far, its seismic potential could be very high, assuming a feasible order of ∼10³ years recurrence cycle. A detailed analysis of long-term position time series of permanent GPS stations in the Guerrero and Oaxaca states, Southern Mexico discards previous models and provides clear evidence of an active LVC fault zone bounding the Xolapa forearc sliver. The southeastward motion of this sliver may have persisted for the last ∼8–10 Million year and played an important role in the tectonic evolution of the region. |
| Databáze: | OpenAIRE |
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