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Stratigraphic evidence of relative sea level changes produced by megathrust earthquakes in the Jalisco subduction zone, Mexico. The signature of the 1995 Colima-Jalisco earthquake (Mw 8) as a modern analogue by Bustamante Fernandez, Emmanuel (author);Woodroffe, Sarah (author);Lloyd, Jeremy M. (author);Shennan, Ian (author) is a Earth and Planetary Sciences article available to read on EtoBox.

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Geological evidence of megathrust earthquakes along the Mexican Pacific coast relies predominantly on tsunami deposits. Records of coseismic relative sea-level changes are scarce even though such evidence can complement and constrain tsunami records, providing information to reconstruct past earthquake rupture dimensions to improve the earthquake hazard assessment of the region. This paper provides the first diatom-based quantitative reconstruction of coastal subsidence along the Mexican subduction zone through the analysis of coastal wetland sediments. We use the stratigraphic signature of the 1995 Colima-Jalisco earthquake (M w 8.0) as this earthquake is instrumentally well-constrained, allowing us to evaluate our findings and establish approaches to investigate earlier earthquakes. Deposits beneath the wetland Estero Potrero Grande reveal a stratigraphic sequence, 1 km of the wetland. Using 14 C ages and 137 Cs chronohorizons to build an age-depth model, we estimate the age range (1985( -2003 CE) CE) and mean age (1995 CE) of this abrupt stratigraphic contact, coincident with the year of the earthquake. Three elemental logratios (S/Zn, Br/Zn and Ca/Zn) indicate an abrupt increa

Who reads Stratigraphic evidence of relative sea level changes produced by megathrust earthquakes in the Jalisco subduction zone, Mexico. The signature of the 1995 Colima-Jalisco earthquake (Mw 8) as a modern analogue?

Author

Bustamante Fernandez, Emmanuel (author);Woodroffe, Sarah (author);Lloyd, Jeremy M. (author);Shennan, Ian (author)

Publisher

Elsevier BV

Published

2023

Language

EN

Field

Earth and Planetary Sciences (Physical Sciences)