Compilation of a harmonized point collection of the vertical deformation componentfrom the 7.6 Mw Limón Earthquake of 1991 in Costa Rica and a comparisonwith the current state of deformation
DOI:
https://doi.org/10.11606/issn.2316-9095.v26-239135Keywords:
Uplift, Earthquake, Co-seismic deformation, Post-seismic relaxation, Vertical componentAbstract
The Limón earthquake that occurred on April 22, 1991, was one of the largest disasters recorded in Costa Rica, resulting in significant uplift on the Caribbean coast. After the earthquake, there have been several investigations into the surface deformations caused by the main shock. However, there is just one instance where researchers tried to gather a homogeneous deformation dataset from the other studies. In our study, we carried out a deeper investigation into several historical sources that report deformations to fill the information gap. Also, we tested the possibility of using the Costa Rica height system to expand the area of coverage, especially at the epicenter and deeper inland. As a result, we gathered 113 observations from 7 different sources, which dated from the date of the 1991 event to 1999. Furthermore, deformation data at 16 benchmarks from the Costa Rican height network were gathered from different studies and new observations. Most of the benchmarks show a positive deformation for the vertical component even when deformation measurements were carried out 30 years after the earthquake.
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