Data shows quake moved Zakynthos by 5cm, not 3cm as first reported

The latest data shows that the 6.4-Richter earthquake that shook the island of Zakynthos a week ago has actually caused the island’s town to shift laterally by five centimetres, not three as first reported, the head of the National Observatory of Athens Geodynamic Institute, Prof. Akis Tselentis, posted on Facebook on Friday.

He also noted that the pattern of post-quake activity around the island was unfolding normally at this time “and is expected to continue with a gradually falling frequency – but not intensity – in the occurrence of aftershocks.” While this meant that the number of aftershocks each day will be fewer, some of them could continue to be strong, he explained.

“It is too soon to say that the aftershock of 5.6 Richter was the main aftershock and the possibility exists that we will have others of the same order of magnitude in the coming months,” he said.

Concerning the lateral shift of the town of Zakynthos, he said the latest analysis of GPS data has shown that this has moved to the southwest by about five centimetres. According to the first announcements, the lateral shift had been “at least three centimetres”.

“Keri has certainly moved more but we don’t have the right equipment in that region,” Tselentis added. Also notable, he said, was the fact that the city of Pyrgos in the Peloponnese has also shifted west by 1.7 cm.

“So far our networks do not show a migration of [quake] epicentres toward another nearby rift,” the post concludes.


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