1. Observatorio Vulcanológico y Sismológico de Costa RicaUniversidad NacionalHeredia Costa Rica
2. Department of Earth and Planetary SciencesUniversity of New MexicoAlbuquerque NM USA
3. Cascades Volcano Observatory, U.S. Geological SurveyVancouver WA USA
4. Dipartimento DiSTeMUniversità di PalermoPalermo Italy
5. Istituto Nazionale di Geofisica e VulcanologiaSezione di Palermo Italy
6. Dirección de Vulcanología,Instituto Nicaragüense de Estudios Territoriales (INETER)Managua Nicaragua
7. Department of GeosciencesThe Pennsylvania State UniversityUniversity Park PA USA