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#ShakeAlert focuses on eq shaking which is controlled by 3 main factors: magnitude, distance from the rupturing fault, and local ground conditions. These factors play a role in how hard and for how long a region will shake. @IRIS_EPO video explains #USGSRemembers #LomaPrieta
@IRIS_EPO Generally, the closer to an earthquake the stronger the shaking you will feel. The Cypress St. viaduct along the Nimitz Freeway (I-880) was 55 miles away from the #LomaPrieta EQ. Why did the viaduct experience such heavy shaking, which caused its tragic collapse? (1/2) 
During an earthquake, loose, soft soil will shake harder and longer than hard rock. Valleys will shake harder than mountains because of their sediment fill. Watch this video from @IRIS_EPO: iris.edu/hq/inclass/ani…
#USGSRemembers (2/2)
#USGSRemembers (2/2)
