19–23 Jun 2023
Hofburg Palace & Online
Europe/Vienna timezone

Operating Comprehensive Nuclear-Test-Ban Treaty Instrumentation Under Extreme Tropical Conditions: Examples from Costa Rica

21 Jun 2023, 17:00
Prinz Eugen Saal

Prinz Eugen Saal

Oral T4.2 Systems Engineering for International Monitoring System and On-Site Inspection O4.2 Systems Engineering for International Monitoring System and On-Site Inspection


Mr John Bolanos (OVSICORI UNA)


The geophysical instrumentation of the CTBT worldwide is important for characterizing nuclear and chemical tests. These observatories have also strengthened the geophysical monitoring capabilities of solid-earth processes like large earthquakes and volcanic eruptions on Earth. However, assuring the correct functioning of this instrumentation is hard under extreme conditions of temperature, humidity, flora coverage and geomorphology of the tropical forest. The site Juntas de Abangares, Auxiliary Station 25 (JTS ) is an example of the needs and solutions that must be carried out in these climatic conditions such as the Costa Rican jungle is. We found that developing a redundant infrastructure for both, seismic recording and telecommunications (VSAT and cellular modem) allows to transmit in real time while having a robust backup system. Under extreme conditions the use of UTP cables for data transmission can generate a long period (120 s) electronic noise that dramatically affects the quality of the data. The replacement of the UTP cables for fiberoptics reduced the effects of high temperatures and humidity of the tropical climate in the data. Furthermore, the use of external antennas helped to stabilize data transmission, since current bunker infrastructure decreased the power of cellular communication and transmission of seismological data.

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Improvements in the transmission data in extreme tropical climate conditions.

E-mail [email protected]
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Primary authors

Mr Esteban J. Chaves (Observatorio Vulcanologico y Sismologico de Costa Rica (OVSICORI)) Ms Evelyn Núñez (Observatorio Vulcanologico y Sismologico de Costa Rica (OVSICORI)) Mr John Bolanos (OVSICORI UNA) Mr Marino Protti (Observatorio Vulcanologico y Sismologico de Costa Rica (OVSICORI))

Presentation materials