The ground under Matsushiro, Japan — measured by the Global Seismographic Network (IRIS/USGS) station IU MAJO 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 |
|---|---|---|---|
| M6.5 | Bonin Islands, Japan region | 1970-01-01 00:00 UTC | 982 km |
| M5.5 | 5 km ESE of Asahi, Japan | 1970-01-01 00:00 UTC | 244 km |
| M5.3 | 44 km ESE of Miyazaki, Japan | 1970-01-01 00:00 UTC | 784 km |
| M5.3 | Bonin Islands, Japan region | 1970-01-01 00:00 UTC | 976 km |
| M5.2 | 0 km ENE of Yokoshiba, Japan | 1970-01-01 00:00 UTC | 228 km |
| M5.1 | 103 km ENE of Miyako, Japan | 1970-01-01 00:00 UTC | 566 km |
| M5.1 | 72 km ENE of Noda, Japan | 1970-01-01 00:00 UTC | 574 km |
| M4.9 | 3 km WSW of Shibayama, Japan | 1970-01-01 00:00 UTC | 219 km |
| M4.8 | 109 km S of Koshima, Japan | 1970-01-01 00:00 UTC | 1,074 km |
| M4.8 | 81 km ENE of Shikotan, Russia | 1970-01-01 00:00 UTC | 1,153 km |
| Mag | Where | When | Distance |
|---|---|---|---|
| M7.7 | 12 km WSW of Pitaloza Arriba, Panama | 1970-01-01 00:00 UTC | 13,645 km |
| M7.0 | 191 km ENE of Nagqu, China | 1970-01-01 00:00 UTC | 4,063 km |
| M6.9 | 76 km NE of Ozernovskiy, Russia | 1970-01-01 00:00 UTC | 2,277 km |
| M6.9 | 197 km WNW of Port-Olry, Vanuatu | 1970-01-01 00:00 UTC | 6,316 km |
| M6.8 | central Mid-Atlantic Ridge | 1970-01-01 00:00 UTC | 15,384 km |
| M6.7 | central Mid-Atlantic Ridge | 1970-01-01 00:00 UTC | 15,348 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.