Massive earthquake rocked Seattle 1,100 years ago, geological evidence confirms.

The simultaneous rupture of faults did trigger a massive earthquake in the Seattle area 1,100 years ago. Geologic evidence, such as fault displacement and tsunami deposits, supports the occurrence of a significant earthquake event during that time period. Scientists have studied these geological markers to understand the history of seismic activity in the region and confirm the occurrence of such a major earthquake event around 1,100 years ago.