34510-345811
(was 1405)
Observatorio Vulcanol????o y Sismol????o de Costa Rica
Universidad Nacional (OVSICORI-UNA)
Apartado Postal: 2346-3000
Heredia
Costa Rica
| Telephone : | (506) 261 0781; 261 0611 |
| Telefax : | (506) 261 0303 |
| Director: | Montero Cascante Carlos |
| Email : | This email address is being protected from spambots. You need JavaScript enabled to view it. |
| Website : | www.ovsicori.una.ac.cr |
Faculty and staff:
Ana Arquedas - Reception
Vilma Barboza - Volcanic seismology
Jorge Brenes - Geology-volcanic hazards
Zaida Campos - Receptionist
Elir Duarte - Volcanology
Erick Fernᮤez - Geochemistry
Victor Gonzᬥz - Seismology, computer
Frederico Guendel - Seismology
Enrique Hernandez - Geodesy, deformation
Eduardo Malavassi - Petrology, volcanic hazards, deformation
Tomas Marino - Geodesy, deformation
Maria Martinez - Geochemistry
Antonio Mata - Electronics
Ghisselle Monge - Secretary
Carlos Montero - Seismology
Jorge M. Protti - Seismology, tectonics
Daniel Rojas - Electronics
Rodrigo Sz - Volcanology
Juan Segura - Seismology
Yadira Sol???? Administrative Assistant
Juan Valdez - Geochemistry
Rodolfo Van der Laat - Geodesy, deformation
Floribeth Vega - Data Analyst
Observatorio Vulcanol????o y Sismol????o de Costa Rica, Universidad Nacional (OVSICORI-UNA) operates a seismographic telemetered network which consists of 25 stations covering all the country and transmitting continuously to the hearquarter at Heredia. The main purpose of the network is to study the seismotectonic setting and to monitor seismic activity associated with volcanoes.
Hence, five of these stations are located close to active volcanoes : Rincon de la Vieja, Arenal, Poᳬ Irazú and Turrialba.
Additionally thirteen portable seismographs are ready for impending situations of local microseismicity or volcano activity.
The next table explains the monitoring routine techniques at each volcano, and it could be increased in the eventuality of abnormal activity.
RINCON DE LA VIEJA VOLCAN
| Method | Record periodicity |
| A permanent seismic station | Continuous |
| One triangle of dry tilt | Every year |
| Visual observation | Twice a year |
ARENAL VOLCANO
| Method | Record periodicity |
| A permanent seismic station | Continuous |
| 3 deformation radial distances | 8 weeks |
| 5 electronic tiltmeters | 2 weeks |
| 6 triangles of dry tilt | 10 weeks |
| 1 radial levelling line (1.6 km) | 4 months |
| Fumarolic temperature | 8 weeks (when possible) |
| 6 H2O Geochemistry stations | 2 weeks |
| 2 Sakurajima traps (KOH) | 4 weeks |
| Acid rain network (7 sta) | 2 weeks |
| Radon emanometry (6 sta) | 2 weeks |
| Visual observation | 2 weeks |
| 2 continuous GPS stations | Continuous (daily positions) |
| 5 broad band stations | Continuous |
PLATANAR VOLCANO
| Method | Record periodicity |
| 2 triangles of dry tilt | Once a year |
POAS VOLCANO
| Method | Record periodicity |
| One permanent seismic station | Continuous |
| Trilateration network (0.72 km2) | 8 weeks |
| 18 km radial levelling line | 3 years |
| 5 triangles of dry tilt | 10 weeks |
| Fumarolic temperature | 4 weeks |
| Fumarolic condensates | 4 weeks |
| 3 Sakurajima traps (KOH) | 4 weeks |
| Acid rain network (7 sta) | 2 weeks |
| Radon emanometry (9 sta) | 2 weeks |
| Visual observation | 2 weeks |
IRAZU VOLCANO
| Method | Record periodicity |
| One permanent seismic station | Continuous |
| Trilateration network (1 km2) | 8 weeks |
| Levelling line and occasional gravimetry survey | 3 years |
| 6 triangles of dry tilt | 10 weeks |
| Fumarolic temperature | Yearly |
| Fumarolic condensates | Yearly |
| Radon emanometry (5 sta) | 2 weeks |
| Visual observation | 2 weeks |
TURRIALBA VOLCANO
| Method | Record periodicity |
| One permanent seismic station | Continuous |
| 6 triangles of dry tilt | 10 weeks |
| Fumarolic temperature | 8 weeks |
| Fumarolic condensates | 8 weeks |
| 1 Sakurajima trap (KOH) | 4 weeks |
| Acid rain network (3 sta) | 2 weeks |
| Radon emanometry (3 sta) | 2 weeks |
| Visual observation | 2 weeks |
INSTRUMENTATION
Seismology
25 telemetered seismographic stations. Each equipment consists of a Ranger SS-1 vertical seismometer, 1 Hz preamplifier and oscillator controller, VHF or UHF radio link and solar panel. The signal is recorded at the Observatory on thermal paper. Digital recording system started in Dec 91.
1 station has one ow gain horizontal component (Wood Anderson Type).
13 Portable MEQ 800 seismic stations.
Deformation
Automatic level NaK2, Wild
Automatic level AL2, Pentax
4 tripod
Theodolite T2000, Wild (UCSC)
EDM DI 3000, Wild (UCSC)
2 GPS antennas, receivers (UCSC)
5 broad band seismometers (Streckeison) (UCSC)
Geochemistry
Thermometer, Thermocouples
Gas and water sampling devices and pipes
6 Sakurajima traps for sampling acid gases
23 double check radon stations
17 acid rain (field stations)
1 specific ton analizer
1 spectrophotometer
1 analytic balance
1 distillator
2 soil ovens
gas chromatograph
Fon chromatograph
AA instrument (6/93)
Petrography
3 rock saws (for thin sections)
3 polishing machines (thin sections)
3 petrographic microscopes