The ground under Yuzhno Sakhalinsk, Russia — measured by the Global Seismographic Network (IRIS/USGS) station IU YSS 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 |
|---|---|---|---|
| M6.9 | 76 km NE of Ozernovskiy, Russia | 1970-01-01 00:00 UTC | 1,185 km |
| M5.8 | 275 km SSW of Severo-Kuril’sk, Russia | 1970-01-01 00:00 UTC | 916 km |
| M5.7 | 152 km SE of Vilyuchinsk, Russia | 1970-01-01 00:00 UTC | 1,333 km |
| M5.5 | 5 km ESE of Asahi, Japan | 1970-01-01 00:00 UTC | 1,263 km |
| M5.3 | 101 km SSE of Vilyuchinsk, Russia | 1970-01-01 00:00 UTC | 1,315 km |
| M5.2 | 0 km ENE of Yokoshiba, Japan | 1970-01-01 00:00 UTC | 1,272 km |
| M5.2 | 101 km SSW of Severo-Kuril’sk, Russia | 1970-01-01 00:00 UTC | 1,011 km |
| M5.1 | 103 km ENE of Miyako, Japan | 1970-01-01 00:00 UTC | 790 km |
| M5.1 | 169 km SE of Petropavlovsk-Kamchatsky, Russia | 1970-01-01 00:00 UTC | 1,405 km |
| M5.1 | 72 km ENE of Noda, Japan | 1970-01-01 00:00 UTC | 727 km |
| Mag | Where | When | Distance |
|---|---|---|---|
| M7.7 | 12 km WSW of Pitaloza Arriba, Panama | 1970-01-01 00:00 UTC | 12,587 km |
| M7.0 | 191 km ENE of Nagqu, China | 1970-01-01 00:00 UTC | 4,411 km |
| M6.9 | 76 km NE of Ozernovskiy, Russia | 1970-01-01 00:00 UTC | 1,185 km |
| M6.9 | 197 km WNW of Port-Olry, Vanuatu | 1970-01-01 00:00 UTC | 7,156 km |
| M6.8 | central Mid-Atlantic Ridge | 1970-01-01 00:00 UTC | 14,558 km |
| M6.7 | central Mid-Atlantic Ridge | 1970-01-01 00:00 UTC | 14,509 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.