Magnitude 6 earthquake off Vanuatu; Tamtam cable stable and fully operational

Earthquake off Vanuatu

At 04:21 local time on October 28, 2026, an earthquake of magnitude 6 occurred off the coast of Vanuatu. The epicenter was located approximately 214 km northwest of Port Olri, at a depth of about 10 km below the ocean surface. The region affected by the earthquake is part of the Pacific Ring of Fire, a geologically active area characterized by frequent seismic and volcanic activity. This zone is formed by the boundaries of tectonic plates, where movements and collisions often result in earthquakes and volcanic eruptions. Vanuatu, situated in the southwestern Pacific Ocean, is particularly vulnerable to such events due to its location along these tectonic boundaries.

Tamtam Cable in Zone of Event

The Tamtam submarine cable, which is set to be operational in 2027, passes within 500 km of the earthquake's epicenter. This cable is designed to enhance connectivity for Vanuatu by linking it to the international telecommunications network through a node in Luganville, located approximately 257 km from the epicenter. The cable spans 411 km and is operated by Prima, a company committed to improving digital infrastructure in the region. Once deployed, the Tamtam cable will play a critical role in supporting Vanuatu's growing digital economy, facilitating faster internet speeds, and ensuring reliable communication for businesses, government services, and residents.

Submarine cables like Tamtam are engineered to withstand various environmental challenges, including seismic activity. The cable's routing and installation are carefully planned to minimize risks, taking into account the geological conditions of the seabed and the potential for natural disasters. This proactive approach ensures the resilience of the infrastructure, even in regions prone to earthquakes.

Measurements Show Stability

GeoCables' advanced monitoring systems, which continuously track critical parameters of submarine cables, confirmed that the Tamtam cable remained stable and fully operational following the earthquake. Despite the proximity of the epicenter to the cable's route, no deviations in network performance were detected. The average round-trip time (RTT) through the region remains within standard values, demonstrating the robustness of the cable's design and its ability to maintain uninterrupted service. This stability is crucial for ensuring seamless communication and data transmission, particularly in areas dependent on submarine cables for connectivity.

Impact on Internet Traffic

Earthquakes of magnitude 6 can pose significant risks to submarine cables, potentially causing disruptions to internet traffic and communication networks. However, the Tamtam cable's resilience and strategic placement have ensured that no interruptions occurred in network operations. This stability is vital for Vanuatu, an island nation that relies heavily on international cable systems to connect to the global telecommunications infrastructure. Reliable connectivity is essential for economic growth, disaster response, and the daily lives of residents, making the performance of submarine cables like Tamtam a cornerstone of regional development.

Plans for Further Monitoring

GeoCables will continue to closely monitor the Tamtam cable, particularly as it approaches its planned commissioning in 2027. Regular monitoring allows for the early detection of any anomalies in network parameters, ensuring that potential issues can be addressed promptly. Additionally, ongoing surveillance of seismic activity in the region will enable timely risk assessments for submarine infrastructure. This proactive approach underscores GeoCables' commitment to maintaining the reliability and resilience of global telecommunications networks, particularly in geologically active areas like the Pacific Ring of Fire.