Skip to main content
Article
Evidence for Static Stress Changes Triggering the 1999 Eruption of Cerro Negro Volcano, Nicaragua and Regional Aftershock Sequences
Geophysical Research Letters
  • M. Diez, University of South Florida
  • P. C. La Femina, University of Miami
  • Charles B. Connor, University of South Florida
  • W. Strauch, Instituto Nicaraguense de Estudios Territoriales
  • Tenorio V. Tenorio, Instituto Nicaraguense de Estudios Territoriales
Document Type
Article
Publication Date
2-23-2005
Digital Object Identifier (DOI)
http://dx.doi.org/10.1029/2004GL021788
Abstract

Remarkable evidence of coupling between tectonic and magmatic events emerges from investigation of three tectonic earthquakes, aftershock sequences and eruption of Cerro Negro volcano, Nicaragua in 1999. Here, we explain this coupling through static stress changes following three Mw 5.2 earthquakes. We use focal mechanism solutions to estimate fault system geometry and magnitude of slip from these events, which are then used to calculate the change in minimum horizontal principal stress (σ3) for the region and the change in Coulomb failure stress on optimally oriented fault planes. Results of these simulations indicate that σ3 was reduced by ∼0.08 MPa and that Coulomb failure stress was raised by 0.001 to 0.2 MPa in the region. A Kolmogorov-Smirnov test demonstrates spatial correlation of Coulomb failure stress changes and triggered seismicity and volcanism, and suggests that these small changes in static stress can trigger subsequent geophysical events under appropriate circumstances.

Citation / Publisher Attribution

Geophysical Research Letters, v. 32, issue 4, art. L04309

© Copyright 2005, American Geophysical Union.

Citation Information
M. Diez, P. C. La Femina, Charles B. Connor, W. Strauch, et al.. "Evidence for Static Stress Changes Triggering the 1999 Eruption of Cerro Negro Volcano, Nicaragua and Regional Aftershock Sequences" Geophysical Research Letters Vol. 32 Iss. 4 (2005)
Available at: http://works.bepress.com/charles_connor/4/