Please use this identifier to cite or link to this item: http://hdl.handle.net/2445/168581
Title: Sand deposits reveal great earthquakes and tsunamis at Mexican Pacific Coast
Author: Ramírez-Herrera, M.T.
Corona, N.
Cerny, J.
Castillo-Aja, R.
Melgar, D.
Lagos, M.
Goguitchaichrili, A.
Machain, M.L.
Vázquez-Caamal, M.L.
Ortuño Candela, María
Caballero, M.
Solano-Hernandez, E.A.
Ruíz-Fernández, A-C.
Keywords: Sorra
Terratrèmols
Tsunamis
Geomorfologia
Sand
Earthquakes
Tsunamis
Geomorphology
Issue Date: 13-Jul-2020
Publisher: Nature Publishing Group
Abstract: Globally, instrumentally based assessments of tsunamigenic potential of subduction zones have underestimated the magnitude and frequency of great events because of their short time record. Historical and sediment records of large earthquakes and tsunamis have expanded the temporal data and estimated size of these events. Instrumental records suggests that the Mexican Subduction earthquakes produce relatively small tsunamis, however historical records and now geologic evidence suggest that great earthquakes and tsunamis have whipped the Pacific coast of Mexico in the past. The sediment marks of centuries old-tsunamis validate historical records and indicate that large tsunamigenic earthquakes have shaken the Guerrero-Oaxaca region in southern Mexico and had an impact on a bigger stretch of the coast than previously suspected. We present the first geologic evidence of great tsunamis near the trench of a subduction zone previously underestimated as potential source for great earthquakes and tsunamis. Two sandy tsunami deposits extend over 1.5 km inland of the coast. The youngest tsunami deposit is associated with the 1787 great earthquake, M 8.6, producing a giant tsunami that poured over the coast flooding 500 km alongshore the Mexican Pacific coast and up to 6 km inland. The oldest event from a less historically documented event occurred in 1537. The 1787 earthquake, and tsunami and a probable predecessor in 1537, suggest a plausible recurrence interval of 250 years. We prove that the common believe that great tsunamis do not occur on the Mexican Pacific coast cannot be sustained.
Note: Reproducció del document publicat a: https://doi.org/10.1038/s41598-020-68237-2
It is part of: Scientific Reports, 2020, vol. 10, num. 11452
URI: http://hdl.handle.net/2445/168581
Related resource: https://doi.org/10.1038/s41598-020-68237-2
ISSN: 2045-2322
Appears in Collections:Articles publicats en revistes (Dinàmica de la Terra i l'Oceà)

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