TAIPEI (Taiwan News) — The Central Weather Administration (CWA) corrected its previous report that the magnitude 6.3 earthquake that struck off the coast of eastern Taiwan on Friday (Aug. 16) was an independent event, saying that it was in fact related to the Hualien April 3 quake.

After reanalysis, the CWA found that the depth of the earthquake was revised from 9.7 km to 19.36 km, and the epicenter was slightly westward, per CNA. Therefore, it was part of the April 3 earthquake’s aftershock sequence, the agency explained.

CWA Seismological Center Director Wu Chien-fu (吳健富) said there have been fewer aftershocks in the southeastern region, meaning less energy has been released there, which could increase the likelihood of larger aftershocks. After reassessing the epicenter, it was confirmed to be further west and deeper than initially determined, prompting its reclassification, he said.

Wu said that while a significant aftershock can occur four months after the mainshock, it is relatively rare. The eastern part of Taiwan is a seismically active region with a higher concentration of energy, so it is crucial to remain cautious of potential aftershocks of magnitude 5.5 or greater within the next three days, he said.