Watch the waves from the M6.4 southern California earthquake roll across the USArray seismic network

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This amazing animation shows the waves from the California M6.4 earthquake traveling through the earth and across earth’s surface on July 4, 2019.

The shaking was felt from Mexico to San Francisco to Las Vegas but was measured across the world. This map shows where people felt shaking around the epicenter.

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A strong and shallow M6.4 earthquake hit Southern California on July 4, 2019. Earthquake map via USGS

This animation of the strongest earthquake of the last 20 years in California, called a Ground Motion Visualization (GMV), shows the motion of the ground as detected on USArray seismometers – each dot is a seismic station and when the ground moves up it turns red and when it moves down it turns blue.

Earthquake waves travel around and through the earth, but they get smaller (attenuate) as they move away from the earthquake location, just like ripples in a pond.

Once the earthquake waves are far enough away from the location where the earthquake occurred they can no longer be felt by people, BUT they can still be detected by sensitive seismic instruments.

That’s what this animation is showing – the waves from the California earthquake traveling through the earth and across earth’s surface. The shaking was felt from Mexico to San Francisco to Las Vegas but was measured across the world. This map shows where people felt shaking.

[USArray, Twitter]

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