Focus Taiwan
Date: 2019/05/30
By: Liu Li-jung, Liao Yu-yang and William Yen

Guishan Island / CNA file photo

Taipei, May 30 (CNA) Tatun Volcanoes in Taipei City and the volcanic island of Guishan off Yilan County have both been revealed to be active, after a long-term study, according to an Academia Sinica researcher Wednesday.

The study was conducted by researcher Lin Cheng-hung (林正洪) and his team, after setting up the Taiwan Volcano Observatory-Tatun (TVO-T), a monitoring and research facility for volcanic activity in Taipei’s Yangmingshan National Park, in 2011.

During a press conference, Lin said that for a volcano to be classified as active it must have erupted within the past 10,000 years and have a magma reservoir underneath it.

A key property of S-waves, one of the two main types of elastic body waves in seismology, is that they are unable to penetrate liquid magma, Lin said, adding that data from the vicinity of Guishan Island showed S-wave shadows and strong S-wave reflections, suggesting the location of a possible magma reservoir in the area.    [FULL  STORY]