Indicators of the Activity Associated with Concealed Feeding Volcanic Fluids in the Tatun Volcano Group, Northern Taiwan
- 1Seismological Center, Central Weather Administration, Taiwan (pu.h.c@hotmail.com)
- 2Institute of Earth Sciences, Academia Sinica, Taipei, Taiwan
- 3Taiwan Volcano Observatory at Tatun, Taipei, Taiwan
- 4National Center for Research on Earthquake Engineering, National Applied Research Laboratories, Taipei, Taiwan
- 5Central Geological Survey, Ministry of Economic Affairs, New Taipei, Taiwan
We analyzed 3,330 earthquake focal mechanisms and the fumarolic gases in the Tatun Volcano Group (TVG) during 2018–2021. Between June/2020 and June/2021, we found a concealed inflation beneath a depth of 2 km. We indicate this inflating mechanism was associated with the feeding volcanic fluids, which induced the past inflating cases in the TVG before 2018. We deliberated about the feeding features regarding this and the past cases and purpose three indicators to monitor such concealed activities, including the inflating indicator associated with the behaviors of earthquake faulting, heating indicator determined by the systematically high HCl/CO2 ratios, and discharging indicator displayed by the lasting high St/CO2 ratios. Using these indicators, we concluded that it was not rare during the last one decade that the concealed activities whose volcanic fluids were discharged occasionally.
How to cite: Pu, H.-C., Lin, C.-H., Lee, H.-F., Lai, Y.-C., Shih, M.-H., Hong, G.-T., and Lee, P.-T.: Indicators of the Activity Associated with Concealed Feeding Volcanic Fluids in the Tatun Volcano Group, Northern Taiwan, EGU General Assembly 2024, Vienna, Austria, 14–19 Apr 2024, EGU24-4922, https://doi.org/10.5194/egusphere-egu24-4922, 2024.
