Geophysical Journal International, 197(3), 1763–1769. Large scale lithospheric detachment of the downgoing Cocos plate: The 8 September 2017 earthquake (M 8.2).
On September 7, 2017, the magnitude-8.2 Tehuantepec earthquake struck offshore, around 125 miles (200 kilometers) southeast of the Tuesday’s epicenter. Reports of a small tsunami have been confirmed and initial estimates show that the nearby coast was uplifted about 1.6 feet (0.5 meters). https://doi.org/10.1093/gji/ggu087Suárez, G., Santoyo, M. A., Hjorleifsdottir, V., Iglesias, A., Villafuerte, C., & Cruz-Atienza, V. M. (2019). Interaction of Cocos and Rivera plates with the upper-mantle transition zone underneath central México. Sismos en México México se encuentra sobre cinco placas tectónicas que interactuan entre sí y colocan al país en una zona de alta sismicidad. Reporte especial: Sismo del 23 de junio de 2020, costa de Oaxaca (M 7.5). On September 7, 2017, the magnitude-8.2 Tehuantepec earthquake struck offshore, around 125 miles (200 kilometers) southeast of the Tuesday’s epicenter.
Characteristic Tectonic Tremor Activity Observed Over Multiple Slow Slip Cycles in the Mexican Subduction Zone. 2017 Tehuantepec earthquake. https://doi.org/10.1016/j.epsl.2018.12.018SSN (2020). For example, permanent deformation created by movement along a fault can increase or decrease stresses on adjacent faults, affecting the likelihood of future earthquakes. In the state of Oaxaca, at least six people were killed by the earthquake. Seismologists are still trying to figure out whether these slow slip events could trigger large earthquakes.
In this region, the Cocos Plate subducts beneath the North American Plate, creating a seismic and volcanic belt along the Pacific coast of Mexico. Las manchas rojas son donde se han producido los principales terremotos costeros. Perez-Campos, X., & Clayton, R. W. (2014). This stress usually diminishes within two fault lengths of a rupture. Normal faults generally accommodate tensional force in Earth’s crust, rather than the compressional force expected when two tectonic plates are being pushed together in a subduction zone. Husker, A., Frank, W. B., Gonzalez, G., Avila, L., Kostoglodov, V., & Kazachkina, E. (2019). Near the epicenter of a large earthquake, the shaking can be very strong, generating significant damage, as was observed in La Crucecita and other cities closest to the epicenter. Preliminary analysis of the stress generated during the Tehuantepec earthquake shows an increase in the surrounding regions, including near the epicenter of the June 23 earthquake. Un ejemplo es el sismo mexicano del 1985, que causó más de 10,000 muertes en la Ciudad de México.
Tuesday’s earthquake triggered the early warning system in México City, over 500 km away from the epicenter.
However, the soft sediments that comprise the México City basin act to slow and amplify these incoming waves. Temblor México 27 noviembre 2017. This earthquake was felt strongly in México City but fortunately, did not result in significant damage. Preliminary estimates by the SSN and the United States Geological Survey show the earthquake occurred on a thrust fault oriented west-northwest, which is consistent with motion along this plate boundary interface. A pesar de que muchos mexicanos buscan en Internet The complexity of the Tehuantepec earthquake rupture is highlighted by the aftershock locations. On June 23, 2020 at about 10:30 am local time, a large magnitude-7.4 earthquake struck the Pacific coast of Oaxaca, México, as reported by the Servicio Sismológico Nacional (SSN), UNAM, the national seismic authority in México. Si bien este tipo de sismo no es el más común en México, de ninguna manera es extraordinario. Residents received an earthquake alert almost two minutes prior to the arrival of the seismic waves that shook buildings throughout the city.
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