Articles tagged “USGS”
Explore posts connected to usgs and use them to jump into related tools, guides, and feature pages.
3 articles with this tag
Foreshocks, Mainshocks, and Aftershocks: What to Expect After a Large Earthquake
Aftershocks get rarer over time, not smaller. Here is what the labels actually mean, why a foreshock can only be identified after the fact, how long sequences last, and what to do while one is going on.
Earthquake Depth Explained: Why Shallow Quakes Do More Damage
A magnitude 6.7 killed 57 people. A magnitude 6.8 three times deeper killed no one directly. Here is how earthquake depth controls shaking, why deep quakes are felt farther but weaker, and when depth stops mattering.
Why Earthquake Magnitudes Change After the First Report
An earthquake posts as M6.9, then becomes M7.1 an hour later. Here is why USGS magnitude, depth, and location estimates get revised, how much change is normal, and which number to trust.
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