The ground under Raoul, New Zealand — measured by the Global Seismographic Network (IRIS/USGS) station IU RAO 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 |
|---|---|---|---|
| M5.9 | Fiji region | 1970-01-01 00:00 UTC | 922 km |
| M5.5 | 122 km W of Neiafu, Tonga | 1970-01-01 00:00 UTC | 1,204 km |
| M5.5 | 283 km E of Levuka, Fiji | 1970-01-01 00:00 UTC | 1,219 km |
| M5.4 | 76 km S of Pangai, Tonga | 1970-01-01 00:00 UTC | 1,043 km |
| M5.3 | 46 km SSE of Otorohanga, New Zealand | 1970-01-01 00:00 UTC | 1,207 km |
| M5.2 | 71 km ESE of ‘Ohonua, Tonga | 1970-01-01 00:00 UTC | 931 km |
| M5.1 | 236 km E of Levuka, Fiji | 1970-01-01 00:00 UTC | 1,250 km |
| M5.0 | 4 km ENE of Inglewood, New Zealand | 1970-01-01 00:00 UTC | 1,314 km |
| M5.0 | 67 km E of ‘Ohonua, Tonga | 1970-01-01 00:00 UTC | 956 km |
| M5.0 | south of the Fiji Islands | 1970-01-01 00:00 UTC | 573 km |
| Mag | Where | When | Distance |
|---|---|---|---|
| M7.7 | 12 km WSW of Pitaloza Arriba, Panama | 1970-01-01 00:00 UTC | 11,111 km |
| M7.0 | 191 km ENE of Nagqu, China | 1970-01-01 00:00 UTC | 11,549 km |
| M6.9 | 76 km NE of Ozernovskiy, Russia | 1970-01-01 00:00 UTC | 9,350 km |
| M6.9 | 197 km WNW of Port-Olry, Vanuatu | 1970-01-01 00:00 UTC | 2,395 km |
| M6.8 | central Mid-Atlantic Ridge | 1970-01-01 00:00 UTC | 16,004 km |
| M6.7 | central Mid-Atlantic Ridge | 1970-01-01 00:00 UTC | 16,032 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.