Fig. 1From: Automated recognition of spikes in 1 Hz data recorded at the Easter Island magnetic observatoryAerial view of the Isla de Pascua (Easter Island) magnetic observatory. The white, rectangular-shaped magnetometer container is located on the left side of the picture; the absolute hut is about 10 m to its right. Trucks circulating on the dirt road behind the observatory may generate more than hundred spikes per day.Back to article page