Explainer: What are the differences of earthquakes, aftershocks, and foreshocks?

Explainer: What are the differences of earthquakes, aftershocks, and foreshocks?

Multiple earthquakes recently hit many parts of the Philippines. KAMI learned that Philippine Institute of Volcanology and Seismology (PHIVOLCS) chief Renato Solidum explained what earthquakes, foreshocks, and aftershocks are.

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In a report by the ABS-CBN News (author Katrina Domingo), the PHIVOLCS chief said that the large earthquake in the series of earthquake events is called the “main shock.”

"Aftershocks and foreshocks are all earthquakes, but all these must be related to a major one or a larger one," he added.

According to the United States Geological Survey (USGS), foreshocks are earthquakes that occur before the main shock in the same location. However, not all main shocks have foreshocks.

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Meanwhile, aftershocks are smaller earthquakes that occur in the same area days, months or even years after the main shock. Usually, the largest aftershock that can happen is “one level of magnitude lower than the main shock.” Solidum noted that seismologists adjust nomenclatures given to seismic activities.

"Even in the Bohol (2013) earthquake, we would see that even after a year, there are smaller events in the area because it will take some time for the rocks to stabilize," the PHIVOLCS chief explained.

As previously reported by KAMI, PHIVOLCS recorded around 490 aftershocks at 8 a.m. on April 23, a day after the earthquake that shook some parts of Luzon. However, only 62 of it were plotted, and only eight were felt.

KAMI also reported earlier the items that should be included in an emergency kit/bag, the emergency hotlines, and things to do before, during, and after an earthquake.

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Source: Kami.com.ph

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