© IRISA screen capture of an animation that shows waves from the Costa Rican earthquake rattling the earth beneath the US. Blue means downward ground motion while red represents upward ground motion with the darker colors indicating larger amplitude.
The visualization was made by scientists at Incorporated Research Institutions for Seismology (IRIS) and shows the Earth slowly moving up and down. Red spots show seismometers moving upward; the darker the hue, the higher they are moving up. The opposite goes for blue.
The visualization shows how earthquakes create waves of motion through the Earth's crust, just as a pebble tossed into a pond creates a ripple. "But in this case, the pond is North America," said John Taber, head of outreach for IRIS.
Comment: Clearly, if both Earth and Mars are undergoing climate change simultaneously, an external factor is responsible for this.
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