Abstract Using the original seismic waveform data of Tonga submarine volcanic eruption in the South Pacific on January 15, 2022, recorded by 70 broadband stations of the Shandong seismic network, we analyze the recording characteristics of volcanic eruption seismic wave from time and frequency domains. By studying the surface wave with 20 s dominant period, we calculate the surface wave magnitude and seismic wave radiation energy of the volcanic eruption. The results show that the surface wave magnitude of the Tonga volcanic eruption is MS5.674 and the energy magnitude is Me5.704, which is basically consistent with the magnitude measured by GFZ and 0.126 smaller than that measured by USGS. The Tonga volcanic explosivity index (VEI) is grade 5, but the seismic wave radiation energy measured in this paper is 8.155×1012 J. The volcanic eruption releases less energy in the form of seismic wave radiation, and most of the energy is rapidly released into the air through the atmosphere in the form of shock wave with the speed more than 1 000 km/h, inhibiting the compression and extension of deep stress.
SHI Yuyan,ZHANG Chunpeng,YAN Qi et al. Surface Wave Magnitude Determination of Volcanic Eruption in Tonga on January 15, 2022[J]. jgg, 2023, 43(2): 209-214.
SHI Yuyan,ZHANG Chunpeng,YAN Qi et al. Surface Wave Magnitude Determination of Volcanic Eruption in Tonga on January 15, 2022[J]. jgg, 2023, 43(2): 209-214.