Seismic Monitoring and Shallow Geoelectric Study to the Geodynamic Behavior of El Totumo Volcano
DOI:
https://doi.org/10.17981/ingecuc.16.1.2020.03Keywords:
salses, mud volcano, seismological monitoring, diapirism, sludge flow, electrical tomographies, microtremors, shear wavesAbstract
Introduction: A geoelectric and microsismological study was motivated by the increase of sismic activity as an energy source associated with volcanic muderuptions in Urabá (May 2017), Cartagena (June 2017) and in Canalete, Córdoba (December 2017). Thisseeks to evaluate the dynamics of the El Totumo volcano which is in the limits of the departments of Bolívar and Atlántico in the Caribbean region of Colombia.
Objective: The aim of this work is to present the results of a geophysical study to determine anomalies related to the dynamics of the volcano. The rising mudflows towards the surface are expected to be detected by analyzing thetomographies; this situation generate risks for tourism in the region.
Methodology: Two geophysical methods were applied here: Geoelectric Prospecting and Seismic Monitoring, with the aim of detecting the distribution of lithological materials in depth, as well as the most important structural features related to the distribution and mud ascent. All of the above was achieved through the analysis of tomographs that clearly reveal the danger generated by the ascending fine mud flows, plus the application of the SPAC (Spatial Autocorrelation) method that allowed the correlation of signal speeds with sedimentary strata, and clearly identify the alteration of the structural support of El Totumo volcano due to the pressure exerted by the surface rising mud. In both mentioned cases, a normal lithological distribution characteristic of the subsoil resistivities is observed by the Geophysical data processing.
Results: However, neither anomalies or structural changes in the electrical tomographs nor traces of seismic nor seismological activity that would have altered the profile of shear wave velocities are observed.
Conclusions: From the above can be drawn that there are no anomalies related to the dynamic behavior of the volcano in this period. The application of the same methodology for future studies of this type of phenomenon not only to the El Totumo volcano but also to any mud volcano is suggested for generating early alerts about the risks that its activity implies in of the people who live nearby.
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