The seismic disturbance that we have been witnessing since the magnitude 8.7 earthquake struck along the strike-slip fault off
Indonesia, continues unabated.
Tonight, several strong tremors rocked one of the world's most seismically active places. Located on the
"Pacific Ring of Fire," an arc of volcanoes and fault lines encircling the Pacific Basin, a magnitude 6.6 earthquake rocked Manokwari, Indonesia. This occurred on Saturday (local time), April 21, 2012 at 01:16:54 UTC, but no tsunami warning was issued. This quake was located at 1.609°S, 134.232°E with a depth of 29.8 km (18.5 miles).
 |
| Magnitude 6.6 near Papua, Indonesia. |
The epicentre was 83km (51mi) southeast from Manokwari, Indonesia; 239km (148mi) northwest from Nabire, Indonesia; 341km (211mi) southeast from Sorong, Indonesia; 477km (296mi) northeast from Tual, Indonesia; and 990km (615mi) south from Koror Town, Palau.
A few hours earlier, a strong 6.1 magnitude earthquake struck off
Indonesia's Sumatra island on Friday (local time), April 20, 2012 at 23:14:31 UTC at a depth of about 25 km (15.5 miles), 427 km southwest of Banda Aceh on the northern tip of Sumatra.
 |
| Magnitude 6.1 off Sumatra. |
There were no immediate reports of damage with either earthquakes.
 |
| Series of earthquakes off Indonesia and Sumatra. |
Aceh province was shaken earlier this month by two huge earthquakes, triggering an Indian Ocean-wide tsunami alert. At a magnitude of 8.7, the first of the two quakes was the strongest to hit since the 2004 Indian Ocean tsunami that killed 170,000 in Aceh.