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Journal of Seismology

, Volume 22, Issue 4, pp 883–896 | Cite as

Seismotectonics of south-west Dominican Republic using recent data

  • Javier Rodriguez
  • Jens Havskov
  • Mathilde Bøttger SørensenEmail author
  • Luis Fernando Santos
ORIGINAL ARTICLE

Abstract

The Dominican Republic has a high level of seismic activity, and a new seismic network has been installed to improve the detection of earthquakes. The network has been operated by Instituto Politécnico Loyola since 2012. It uses six new stations of its own, as well as 17 other stations publically available. In this study, we investigate in particular the south-west of the country where no seismic stations have been operating before. We find an area, SE of the Enriquillo Plantain Garden fault (responsible for the 2010 Haiti M7.0 earthquake), with a high seismic activity (M = 2–4) compared to the surrounding area. This shallow seismicity (except two events around 40 km depth) is not seen in any global catalogs, and it does not seem to be associated with any known faults. However, the region has been under rapid recent uplift since margins between hills and valleys are filled with massive alluvial fans. We made 24 new fault plane solutions using P-polarities and S/P amplitude ratios. The solutions show mainly reverse mechanisms and the P-axis directions are mainly NNE oriented, which is in agreement with a published strain direction from GPS measurements. We conclude that the main cause of the seismicity in our study area is the push of the Beata Ridge against Enriquillo basin and the rest of the Gonave microplate, reflected in the mainly reverse focal mechanisms.

Keywords

Dominican Republic Seismicity Fault plane solutions Seismic network 

Notes

Acknowledgements

We want to thank Instituto Politécnico Loyola of San Cristobal as well as University of Bergen for helping us build our small seismic network, also to the Incorporated Research Institutions for Seismology (IRIS) for letting us grab the real time seismicity of foreign networks. In particular, it enabled to use stations from the Dominican National Network to whom we are grateful. Also to Dr. Jay Pulliam of Baylor University in USA, for allowing us to access seismic data in our region for particular events. Eddy Perez and Dr. Alexius Santoni in the telecommunication, maintenance, and data processing support, both founders of our Seismic Observatory.

The period 2015–2017 was partially supported with funds from the Ministry of Superior Education, Science and Technology, (MEESCYT) through the National Funds for Science and Technology Research (FONDOCYT).

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Copyright information

© Springer Science+Business Media B.V., part of Springer Nature 2018

Authors and Affiliations

  1. 1.Observatorio Sismológico Politécnico LoyolaSan CristobalDominican Republic
  2. 2.Department of Earth ScienceUniversity of BergenBergenNorway

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