Calcite Veins (image)

University of Wisconsin-Madison

Caption

The white calcite 'veins' of the Loma Blanca fault are evident in this slab of rock on the fault. These veins of calcite reveal a record of fluid-driven earthquakes clustered together on a fault typically characterized by less frequent, periodic earthquakes caused by mechanical stress. They helped UW-Madison researchers trace the oldest and longest earthquake record ever documented.

Credit

Courtesy of Laurel Goodwin and Randy Williams, UW-Madison

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