By Shelley Shan / Staff reporterThe Central Weather Bureau (CWB) is to start building the nation’s first volcano alert system this year, Seismological Center Director Chen Kuo-chang (陳國昌) said yesterday. “We will spend this year and next building a national volcano alert system and establishing the procedures that we should follow in issuing warnings,” Chen said. Japan, the Philippines and New Zealand use a five-level warning system because they experience frequent volcanic activity, Chen said. However, the Datun Volcano Group is less active than volcanoes in those nations, he added. Lin’s team also detected a volcanic “pulse” from the Datun volcanoes, with an earthquake occurring on average about every 18 minutes, a phenomenon that last for hours.