| 英文摘要 |
Northern Taiwan has considerable volcanic activity, and the Tatun Volcano Group (TVG) is a noteworthy area. Surveying and monitoring data taken over two decades indicate that the TVG is an active volcanic group. A volcano observatory was established in 2011 to monitor the volcanic activity using various methods, including seismic activity, fluid geochemistry, and ground deformation. The mission of the volcano observatory is to understand the characteristics of the TVG, monitor possible activity of the magma reservoir, and forecast its future activity. The number of seismic events in the TVG increased in 2019 by approximately 1.5 times the background value. In 2020, the number increased by as much as twice the background value. In addition to the significant increase in the number of microseisms, earthquakes with magnitudes greater than 3.0 have also increased. Over the same period, the geochemical results were also abnormal, and specifically include a significant increase in the emission of helium and hydrogen chloride. Combining the geochemical and seismic results, it is evident that the TVG has become more active in 2019 and 2020, and that the activity is dominated by hydrothermal activity. At present, no obvious magmatic activity is suggested from observations of the TVG；however, monitoring must continue to forecast possible disasters caused by hydrothermal activity, such as phreatic eruptions. |
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