2 chapters across the catalog
A 6.0 magnitude earthquake struck Northern California near Napa Valley at approximately 3:00 AM. The event caused damage to wineries and broken bottles in the region, though it was described as a "roller" that many residents did not feel. The measurement of seismic activity has shifted from the Richter scale to the moment magnitude scale, which allows for different classifications of geological movement.
Los Angeles Earthquake, Moment Magnitude Scale vs Richter Scale
A 4.4 magnitude earthquake struck Los Angeles, centered near Pico Rivera at a depth of 18.9 kilometers. The discussion notes that geologists have transitioned from the Richter scale to the Moment Magnitude Scale (MW), which measures energy release rather than wave amplitude. This change in measurement makes historical comparisons of earthquake intensity more difficult for the public.
