美国加州大学Ricardo Garza-Girón的研究团队报道了2022年1月15日汤加火山喷发期间的地球-大气固体相互作用力。2023年1月11日出版的《科学进展》杂志发表了这项成果。

研究人员通过分析周期约小于50s的远震P波和瑞雷波，确定力的时间历程提供对整个火山爆发过程的了解依据。火山爆发后续而来的大气声学重力兰姆波在经过陆地时产生了宽频的地面运动，以及驱动的和常规的海啸波。声源附近的大气驻波产生了4 × 10¹²N的振荡峰值力，激发了频率为3.7和4.6mHz的共振固体地球瑞雷波运动。

据悉，2022年1月15日汤加火山爆发期间，火山物质的快速喷发在地球上产生了约2.0 × 10¹³N的向下脉冲反作用力，能观测到辐射地震波遍及全球，震源爆发约25秒，后续影响持续了约4.5小时。

附：英文原文

Title: Solid Earth–atmosphere interaction forces during the 15 January 2022 Tonga eruption

Author: Ricardo Garza-Girón, Thorne Lay, Frederick Pollitz, Hiroo Kanamori, Luis Rivera

Issue&Volume: 2023-01-11

Abstract: Rapid venting of volcanic material during the 15 January 2022 Tonga eruption generated impulsive downward reaction forces on the Earth of ~2.0 × 10¹³N that radiated seismic waves observed throughout the planet, with ~25 s source bursts persisting for ~4.5 hours. The force time history is determined by analysis of teleseismic P waves and Rayleigh waves with periods approximately <50 s, providing insight into the overall volcanic eruption process. The atmospheric acoustic-gravity Lamb wave expanding from the eruption produced broadband ground motions when transiting land, along with driven and conventional tsunami waves. Atmospheric standing acoustic waves near the source produced oscillatory peak forces as large as 4 × 10¹²N, exciting resonant solid Earth Rayleigh wave motions at frequencies of 3.7 and 4.6 mHz.

DOI: add4931

Source: https://www.science.org/doi/10.1126/sciadv.add4931