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The 10 April 2014 Nicaraguan Crustal Earthquake: Evidence of Complex Deformation of the Central American Volcanic Arc

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Abstract

On 10 April 2014, an M w 6.1 earthquake struck central Nicaragua. The main event and the aftershocks were clearly recorded by the Nicaraguan national seismic network and other regional seismic stations. These crustal earthquakes were strongly felt in central Nicaragua but caused relatively little damage. This is in sharp contrast to the destructive effects of the 1972 earthquake in the capital city of Managua. The differences in damage stem from the fact that the 1972 earthquake occurred on a fault beneath the city; in contrast, the 2014 event lies offshore, under Lake Managua. The distribution of aftershocks of the 2014 event shows two clusters of seismic activity. In the northwestern part of Lake Managua, an alignment of aftershocks suggests a northwest to southeast striking fault, parallel to the volcanic arc. The source mechanism agrees with this right-lateral, strike-slip motion on a plane with the same orientation as the aftershock sequence. For an earthquake of this magnitude, seismic scaling relations between fault length and magnitude predict a sub-surface fault length of approximately 16 km. This length is in good agreement with the extent of the fault defined by the aftershock sequence. A second cluster of aftershocks beneath Apoyeque volcano occurred simultaneously, but spatially separated from the first. There is no clear alignment of the epicenters in this cluster. Nevertheless, the decay of the number of earthquakes beneath Apoyeque as a function of time shows the typical behavior of an aftershock sequence and not of a volcanic swarm. The northeast–southwest striking Tiscapa/Ciudad Jardín and Estadio faults that broke during the 1972 and 1931 Managua earthquakes are orthogonal to the fault where the 10 April earthquake occurred. These orthogonal faults in close geographic proximity show that Central Nicaragua is being deformed in a complex tectonic setting. The Nicaraguan forearc sliver, between the trench and the volcanic arc, moves to the northwest relative to the Caribbean plate at a rate of 14 mm/year. Part of the deformation is apparently accommodated by strain partitioning in the form of bookshelf faulting, on a system of orthogonal faults. The sinistral faults striking northeast–southwest rotate blocks of the Caribbean plate in a clockwise manner. The recent crustal earthquakes in central Nicaragua in 1931, 1972 and 2005 earthquakes took place on these left-lateral faults. The motion of the forearc sliver is also accommodated by a second set of right-lateral, strike-slip faults oriented parallel to the volcanic arc. Faults with this orientation and direction of motion are responsible for the 2014 and possibly the 1955 earthquakes. The presence of this geometry of orthogonal crustal faults highlights the seismic hazard posed by this complex faulting system, not only in the capital city of Managua, but also to the major Nicaraguan cities, which lie close to the volcanic arc.

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Acknowledgments

The authors acknowledge Grant Number 082821 from the Mexican Council of Science and Technology (CONACYT) for support in conducting this work and a grant from the Secretaría de Relaciones Exteriores de México (Foreign Ministry of Mexico), which allowed the authors to enjoy scientific exchange visits. Thanks are due to the Instituto Nacional de Estudios Territoriales of Nicaragua (INETER) for providing data from the national seismic network. Support from Jorge A. Castillo in relocating the mainshock of 10 April is acknowledged. The authors would like to thank two anonymous reviewers and W. Bandy for valuable comments and suggestions that greatly improved the paper.

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Authors and Affiliations

  1. Instituto de Geofísica, Universidad Nacional Autónoma de México, 04510, México City, Mexico

    Gerardo Suárez & David A. Novelo-Casanova

  2. Instituto Nacional de Estudios Territoriales (INETER), Managua, Nicaragua

    Angélica Muñoz, Emilio Talavera & Virginia Tenorio

  3. Terracon Ingeniería S.A. de C.V., México City, Mexico

    Isaac A. Farraz

  4. Trimble Navigation Ltd., Plano, TX, USA

    Antonio Sánchez

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  1. Gerardo Suárez
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Correspondence to Gerardo Suárez.

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Suárez, G., Muñoz, A., Farraz, I.A. et al. The 10 April 2014 Nicaraguan Crustal Earthquake: Evidence of Complex Deformation of the Central American Volcanic Arc. Pure Appl. Geophys. 173, 3305–3315 (2016). https://doi.org/10.1007/s00024-015-1201-z

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