A 6.4-magnitude earthquake struck Northern California

The USGS reports that more than three dozen smaller earthquakes have been reported across the territory of Northern California as a 6.4-magnitude quake struck early Tuesday.

These smaller movements are known as aftershocks. Here’s what to know about them as the district continues to assess the damage.

What is an aftershock? An aftershock is a smaller earthquake that occurs in the same general area of ​​larger activity, according to the US Geological Survey (UGS). The USGS says on its website that these smaller earthquakes are caused by a readjustment error for the larger earthquake.

The Seismology Laboratory at UC Berkeley puts it this way:

“Imagine you and a friend sliding a large wooden dresser into a new location across a wood or tile floor. After it’s in place, you may hear little creaks or pops coming from it as it settles,” he explains on his website, referring to the method by which the plates settle into their new positions after they have been shaken by the main earthquake – causing aftershocks.”

The USGS says the frequency of these aftershocks is decreasing over time.

What is the difference between an aftershock and a “swarm”? What’s happening in Northern California on Tuesday is defined as an earthquake and aftershocks because there was a “main shock,” or major, larger, identifiable earthquake.

“A swarm, on the other hand, is a series of mostly small earthquakes with no identifiable main shock. The swarms are usually short-lived, but can last for days, weeks, or sometimes even months. They often recur in the same locations,” the agency says. The US Geological Survey says most locust swarms are associated with geothermal activity.

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