Qualla: 2016 Sumatra Earthquake

2016 Sumatra Earthquake: Introduction

Wed, 25 Mar 2026 00:00:00 GMT

On the evening of March 2, 2016, the seafloor lurched ten kilometers beneath the Indian Ocean. The rupture was enormous - a magnitude 7.8 strike-slip fault releasing energy equivalent to roughly 500 kilotons of TNT - yet it happened in one of the most fortunate locations an earthquake of that power could strike. Eight hundred kilometers southwest of Sumatra, far from any coastline, the quake sent shockwaves rippling outward through the ocean and across the islands of Indonesia without killing a single person.

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2016 Sumatra Earthquake: A Number That Kept Shrinking

Wed, 25 Mar 2026 00:00:00 GMT

The United States Geological Survey's first reading pegged the earthquake at magnitude 8.2, a figure that would have placed it among the most powerful seismic events in recent memory. Within hours, the number was revised downward to 8.1, then 7.9, before settling at the official ...

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2016 Sumatra Earthquake: Tremors Across Three Nations

Wed, 25 Mar 2026 00:00:00 GMT

The epicenter sat roughly 805 kilometers southwest of Padang, the capital of West Sumatra province. The closest inhabited land was the Mentawai Islands, a chain of more than seventy islands where indigenous communities have lived for thousands of years. But the quake's reach exte...

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2016 Sumatra Earthquake: The Hours of Uncertainty

Wed, 25 Mar 2026 00:00:00 GMT

Tsunami warnings went out immediately. Indonesia's disaster agencies activated their alert systems, and Australian authorities issued warnings for Cocos Island, Christmas Island, and portions of the mainland coast. Across Sumatra, families grabbed what they could carry and fled f...

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2016 Sumatra Earthquake: Living on the Ring of Fire

Wed, 25 Mar 2026 00:00:00 GMT

Indonesia straddles the most seismically active zone on Earth. The Indo-Australian Plate grinds beneath the Eurasian Plate along the Sunda Trench, producing a conveyor belt of earthquakes that has shaped both the geology and the psychology of the archipelago. The catastrophic 200...

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