Qualla: 2007 Bengkulu Earthquakes

2007 Bengkulu Earthquakes: Introduction

Thu, 26 Mar 2026 00:00:00 GMT

At 6:10 in the evening on September 12, 2007, the ground beneath Bengkulu began to shake and did not stop for several minutes. One hundred and thirty kilometers offshore, along the Sunda Trench where the Australian Plate grinds beneath the Sunda Plate, a 250-by-170-kilometer section of the subduction interface had just ruptured. The resulting earthquake registered 8.4 on the moment magnitude scale, placing it among the twenty largest quakes ever captured by a seismograph. Before the night was over, two more earthquakes of magnitude 7.0 and 7.9 would follow, and tsunami warnings would reach from Indonesia to India, Malaysia to the Cocos Islands.

2007 Bengkulu Earthquakes: Three Blows in Twenty Hours

Thu, 26 Mar 2026 00:00:00 GMT

The first and largest earthquake struck at 11:10 UTC, its focal point 34 kilometers below the seabed, roughly 130 kilometers southwest of the city of Bengkulu on Sumatra's southwest coast. It was followed within hours by a cascade of aftershocks in the magnitude 5-to-6 range alon...

2007 Bengkulu Earthquakes: Buildings Swaying Six Hundred Kilometers Away

Thu, 26 Mar 2026 00:00:00 GMT

The tremors from the 8.4 earthquake radiated outward with frightening reach. In Bengkulu, about 100 kilometers from the epicenter, buildings collapsed and power failed, cutting the city's communications at the worst possible moment. Six hundred kilometers to the northwest, in Jak...

2007 Bengkulu Earthquakes: Waves Across the Ocean

Thu, 26 Mar 2026 00:00:00 GMT

Sea level gauges confirmed what seismologists feared: the earthquake had generated a tsunami. Four separate tsunami alerts were issued within 24 hours. The Pacific Tsunami Warning Centre broadcast warnings across the Indian Ocean basin. At Padang, a wave approximately one meter h...

2007 Bengkulu Earthquakes: The Engine Beneath the Trench

Thu, 26 Mar 2026 00:00:00 GMT

The earthquakes were caused by thrust faulting along the boundary where the Australian Plate slides beneath the Sunda Plate at roughly 69 millimeters per year. This motion is oblique to the plate boundary, meaning the Australian Plate moves northeast relative to Sumatra while the...

2007 Bengkulu Earthquakes: A Coast That Remembers

Thu, 26 Mar 2026 00:00:00 GMT

The 2007 Bengkulu earthquakes belonged to a devastating decade for Sumatra. The catastrophic 2004 Indian Ocean earthquake and tsunami had struck the northern end of the same subduction zone less than three years earlier. The March 2007 Sumatra earthquakes had hit the same general...