Summary:
- Researchers have finally solved the mystery of a 9-day long, global seismic event that was detected in 2018 but could not be identified at the time.
- The seismic event was caused by a slow-motion earthquake, also known as a "slow slip event," that occurred off the coast of Canada's Vancouver Island.
- This type of slow-motion earthquake is difficult to detect using traditional seismic monitoring methods, but the new findings provide insights into the complex tectonic processes that can occur beneath the Earth's surface.