The hand-dug trench across a previously unknown fault scarp provided evidence of what could be the oldest and youngest earthquakes in the region. Credit: Stephen Angster

The hand-dug trench across a previously unknown fault scarp provided evidence of what could be the oldest and youngest earthquakes in the region. Credit: Stephen Angster

The hand-dug trench across a previously unknown fault scarp provided evidence of what could be the oldest and youngest earthquakes in the region. Credit: Stephen Angster

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