The ground under Port Moresby, Papua New Guinea — measured by the GEOFON network (GFZ Potsdam) station GE PMG 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 |
|---|---|---|---|
| M6.2 | 86 km SSE of Panguna, Papua New Guinea | 1970-01-01 00:00 UTC | 981 km |
| M6.0 | 128 km S of Kokopo, Papua New Guinea | 1970-01-01 00:00 UTC | 701 km |
| M5.4 | 33 km ESE of Ambunti, Papua New Guinea | 1970-01-01 00:00 UTC | 719 km |
| M5.3 | 129 km S of Kokopo, Papua New Guinea | 1970-01-01 00:00 UTC | 698 km |
| M5.2 | 63 km NNE of Lae, Papua New Guinea | 1970-01-01 00:00 UTC | 360 km |
| M5.1 | 167 km ESE of Gizo, Solomon Islands | 1970-01-01 00:00 UTC | 1,207 km |
| M5.1 | 123 km S of Kokopo, Papua New Guinea | 1970-01-01 00:00 UTC | 700 km |
| M5.1 | 127 km SSE of Kokopo, Papua New Guinea | 1970-01-01 00:00 UTC | 746 km |
| M5.0 | 115 km S of Kokopo, Papua New Guinea | 1970-01-01 00:00 UTC | 706 km |
| M5.0 | 61 km SW of Panguna, Papua New Guinea | 1970-01-01 00:00 UTC | 920 km |
| Mag | Where | When | Distance |
|---|---|---|---|
| M7.7 | 12 km WSW of Pitaloza Arriba, Panama | 1970-01-01 00:00 UTC | 14,744 km |
| M7.0 | 191 km ENE of Nagqu, China | 1970-01-01 00:00 UTC | 7,320 km |
| M6.9 | 76 km NE of Ozernovskiy, Russia | 1970-01-01 00:00 UTC | 6,894 km |
| M6.9 | 197 km WNW of Port-Olry, Vanuatu | 1970-01-01 00:00 UTC | 2,067 km |
| M6.8 | central Mid-Atlantic Ridge | 1970-01-01 00:00 UTC | 18,172 km |
| M6.7 | central Mid-Atlantic Ridge | 1970-01-01 00:00 UTC | 18,249 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.