Those quakes earlier this month in California may have seemed unusual, but although their higher magnitudes make them less common than others, the state is actually always being rocked by temblors. Just check out this stunning animation by the Pacific Tsunami Warning Center and see for yourself.
, enough to cause damage; hundreds more have registered as magnitude 3.0 or above events, which are sufficient to be felt at the surface.
A recent, groundbreaking study used some rather clever algorithms to go back through the modern seismic record of Southern California to pick out earthquakes that seismometers may have missed; temblors that slipped through, disguised as background noise like traffic or even strong wind battering the surface. Scientists eventually found more thanthat took place from 2008 to 2017, with some coming in as weak as magnitude 0.3 events.
That’s why this animation is utterly fantastic: it shows plenty the quakes that have rocked the region in the past 30 years, including the depth of the fault that slipped. It also includes several powerful shakes that are certainly in the same league as the stars of the Ridgecrest Earthquake Sequence; these include the magnitude 7.2 quake at Cape Mendocino back in April 1992, which caused a tiny tsunami – hence, why the Pacific TWC made this animation in the first place.
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