publication . Thesis . 2013

Geophysical investigations of magma plumbing systems at Cerro Negro volcano, Nicaragua

MacQueen, Patricia Grace;
Open Access
  • Published: 27 Nov 2013
  • Country: Canada
Abstract
Cerro Negro near Léon, Nicaragua is a very young (163 years), relatively small basaltic cinder cone volcano that has been unusually active during its short lifespan (recurrence interval 6-7 years), presenting a significant hazard to nearby communities. Previous studies have raised several questions as to the proper classification of Cerro Negro and its relation to neighboring Las Pilas-El Hoyo volcano. Analysis of Bouguer gravity data collected at Cerro Negro has revealed connected positive density anomalies beneath Cerro Negro and Las Pilas-El Hoyo. These findings suggest that eruptions at Cerro Negro may be tapping a large magma reservoir beneath Las Pilas-El ...
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Appendices.................................................................................................................. 128  Appendix A: Magnetic Surveys in Volcanic Regions - A Guide to Best Field Practices .............................................................................................................. 129  Appendix B: Total Magnetic Field Measurements of Cerro Negro............................... 158  Appendix C: Dynamic Gravity Measurements at Cerro Negro..................................... 163  Appendix D: Matlab Codes .......................................................................................... 172  Appendix E: Complete Data Tables ............................................................................. 198  Name Gravity Latitude FAreire Bouguer BuBll- DInTnMe1r- DOTuMte2r- Bathymetry SR6 82.932 2.657 23.782 -8.27 0.106 0.386 0.146 0.178 SR7 74.359 3.426 32.358 -11.252 0.143 0.301 0.115 0.192 SR8 70.124 4.539 38.997 -13.561 0.171 0.12 0.109 0.209 SR9 70.498 3.585 43.392 -15.09 0.19 0.279 0.107 0.206 Corrections include Latitude, Free Air, Bouguer, Bullard-B, inner and outer terrain corrections, and bathymetry corrections

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