A magnitude 5.1 earthquake struck off the coast of eastern Taiwan Thursday evening. The Central Weather Administration (CWA) says the area is prone to seismic activity, and warns that another quake between 4.5 to 5 on the Richter scale could be possible within the next three days.

The highest intensity occurred in Hualien County, which reached a level 4 on Taiwan’s 7-tier scale. The epicenter of the quake was in the water east of Taiwan, and likely occurred because of a collision between the Philippine and Eurasian sea plates. Earthquake observation section chief Lin Tzu-wei (林祖慰) explains that the quake, which was described as very shallow, met the criteria for a national warning in Hualien County.

Lin also explains that because the area is in the Eurasian Plate subduction zone and prone to seismic activity, another quake between 4.5 and 5 in the next three days cannot be ruled out. No damage as a result of the earthquake has yet been reported, but citizens are advised to stay vigilant and be prepared.