The ground under Lusaka, Zambia — measured by the Global Seismographic Network (IRIS/USGS) station IU LSZ 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 |
|---|---|---|---|
| M4.7 | 18 km NNW of Igugunu, Tanzania | 1970-01-01 00:00 UTC | 1,398 km |
| M4.6 | 42 km NNE of Kilimatinde, Tanzania | 1970-01-01 00:00 UTC | 1,322 km |
| M4.6 | 43 km N of Kilimatinde, Tanzania | 1970-01-01 00:00 UTC | 1,322 km |
| M4.5 | 23 km SSW of Katesh, Tanzania | 1970-01-01 00:00 UTC | 1,408 km |
| M4.5 | 17 km E of Mtinko, Tanzania | 1970-01-01 00:00 UTC | 1,406 km |
| M3.6 | 1970-01-01 00:00 UTC | 1,311 km |
| Mag | Where | When | Distance |
|---|---|---|---|
| M7.7 | 12 km WSW of Pitaloza Arriba, Panama | 1970-01-01 00:00 UTC | 12,255 km |
| M7.0 | 191 km ENE of Nagqu, China | 1970-01-01 00:00 UTC | 8,754 km |
| M6.9 | 76 km NE of Ozernovskiy, Russia | 1970-01-01 00:00 UTC | 13,966 km |
| M6.9 | 197 km WNW of Port-Olry, Vanuatu | 1970-01-01 00:00 UTC | 14,304 km |
| M6.8 | central Mid-Atlantic Ridge | 1970-01-01 00:00 UTC | 5,482 km |
| M6.7 | central Mid-Atlantic Ridge | 1970-01-01 00:00 UTC | 5,549 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.