A magnitude 5.7 earthquake yesterday struck off the coast of Hualien, causing brief transportation disruptions in northern and eastern Taiwan, as authorities said that aftershocks of magnitude 5 or higher could occur over the next three days.
The quake, which hit at 7:24pm at a depth of 24.5km, registered an intensity of 4 in Hualien and Nantou counties, the Central Weather Administration (CWA) said.
There were no immediate reports of damage or injuries.
Photo courtesy of the Central Weather Administration
In Taipei, the MRT railway’s operations control center received an earthquake alert and initiated standard safety procedures, briefly halting trains on the Bannan (blue) line for about a minute.
Services returned to normal after the system confirmed the quake’s intensity, the operator said.
Meanwhile, Taiwan Railway Corp implemented speed restrictions on parts of the eastern line after stations, including Chongde (崇德), Hualien, Nanao (南澳) and Yuli (玉里), recorded intensity levels of 3 or 4.
The speed restrictions could result in delays for some services, Taiwan Railway said.
The earthquake was a shallow event triggered by the ongoing collision between the Philippine Sea Plate and the Eurasian Plate, Wu Chien-fu (吳健富), director of the CWA’s Seismological Center, told a news briefing last night.
Aftershocks of magnitude 5 to 5.5 are possible within the next three days, Wu said, adding that people should remain alert.
The epicentral area is highly active, recording 24 earthquakes of magnitude 5.5 or higher since 2002, most at depths shallower than 50km, he said.
Taiwan’s overall seismic activity this year remains within the long-term average, with four earthquakes in the magnitude 6 to 7 range and 40 in the magnitude 5 to 6 range, he added.
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