4 ms·
https://earthquake.usgs.gov/data/dyfi/ https://earthquake.usgs.gov/data/dyfi/ USGS' "Did you Feel it Program" helps USGS figure out how seismic waves travel thr
by gvhst 5y ago
https://earthquake.usgs.gov/data/dyfi/ https://earthquake.usgs.gov/data/dyfi/ USGS' "Did you Feel it Program" helps USGS figure out how seismic waves travel through the crust, which isn't uniform in density. Useful beyond seismographs.