NEIC moved from Boulder to Golden, Colorado in 1974. Located 10 miles west of Denver, Colorado
Measures earthquake effects at specific locations, unlike magnitude scales. Developed from Giuseppe Mercalli's 1902 scale. Original scale had 10 degrees, later expanded to 12 by Cancani and Sieberg
Seismic waves are mechanical acoustic energy that travel through Earth. They can result from earthquakes, volcanic eruptions, or man-made explosions. Seismologists record waves using seismometers, hydrophones, or accelerometers
Charles Richter and Beno Gutenberg developed the scale in 1935. Scale measures earthquake strength using logarithmic amplitude measurements. Each whole number increase represents tenfold increase in amplitude. Magnitude 0 corresponds to 1 micron maximum amplitude at 100 km
Geologists study Earth's structure, composition, and history using multiple scientific disciplines. They investigate natural resources and monitor environmental hazards. Geologists contribute to climate change discussions
Aftershocks are smaller earthquakes following larger ones in the same area. Large earthquakes can have hundreds to thousands of detectable aftershocks. Aftershocks typically occur up to the rupture length from the fault plane