Inertial effects due to eruption-induced atmospheric disturbances identified by superconducting gravimeter observations at Matsushiro, Japan

Abstract The violent eruption of Hunga Tonga-Hunga Ha’apai volcano on January 15, 2022 induced strong atmospheric disturbances, which traveled around the world as Lamb waves. When this wave passed through superconducting gravimeter station at Matsushiro, Japan, a large signal gravity changes was recorded. Also, barometers installed Matsushiro recorded trains pressure changes. Analysis barometer data revealed that disturbances plane Applying theory loading for traveling waves, observed were well reproduced by sum three components loading, namely, Newtonian, free-air and inertial effects. In particular, effect is rarely observed, clearly identified in data. From theoretical modeling, an estimate rigidity shallow region Earth also obtained. Graphic