The ground under Boaco, Nicaragua — measured by the GEOFON network (GFZ Potsdam) station GE BOAB and redrawn here every 15 minutes. A thin band means a quiet ground; a tall spike is a passing earthquake, near or on the other side of the planet.
| Mag | Where | When | Distance |
|---|---|---|---|
| M7.7 | 12 km WSW of Pitaloza Arriba, Panama | 1970-01-01 00:00 UTC | 761 km |
| M6.6 | 12 km W of Río Grande, Panama | 1970-01-01 00:00 UTC | 702 km |
| M6.1 | 15 km W of Río Grande, Panama | 1970-01-01 00:00 UTC | 699 km |
| M6.0 | 7 km N of La Tronosa, Panama | 1970-01-01 00:00 UTC | 781 km |
| M5.8 | 1 km S of El Cacao, Panama | 1970-01-01 00:00 UTC | 802 km |
| M5.6 | 91 km SW of Tamarindo, Costa Rica | 1970-01-01 00:00 UTC | 310 km |
| M5.5 | 3 km SW of Bajo Corral, Panama | 1970-01-01 00:00 UTC | 799 km |
| M5.4 | 47 km SSW of Puerto Vidal, Panama | 1970-01-01 00:00 UTC | 684 km |
| M5.4 | 9 km SSE of Los Asientos, Panama | 1970-01-01 00:00 UTC | 826 km |
| M5.4 | off the coast of Ecuador | 1970-01-01 00:00 UTC | 1,285 km |
| Mag | Where | When | Distance |
|---|---|---|---|
| M7.7 | 12 km WSW of Pitaloza Arriba, Panama | 1970-01-01 00:00 UTC | 761 km |
| M7.0 | 191 km ENE of Nagqu, China | 1970-01-01 00:00 UTC | 15,030 km |
| M6.9 | 76 km NE of Ozernovskiy, Russia | 1970-01-01 00:00 UTC | 10,670 km |
| M6.9 | 197 km WNW of Port-Olry, Vanuatu | 1970-01-01 00:00 UTC | 12,336 km |
| M6.8 | central Mid-Atlantic Ridge | 1970-01-01 00:00 UTC | 7,442 km |
| M6.7 | central Mid-Atlantic Ridge | 1970-01-01 00:00 UTC | 7,380 km |
Waves from a large earthquake reach this station minutes later — up to about 20 minutes from the far side of the Earth. Look for a spike in the helicorder at that time.