NASAのInSightが火星で初めて隕石衝突の音を聞く(NASA’s InSight hears its first meteoroid impacts on Mars)


火星着陸船の地震計は、過去2年間に4回の衝突による振動と音を拾いました。この進展は、ブラウン大学の惑星科学者イングリッド・ドーバルの共著で詳述されています。 The Mars lander’s seismometer picked up vibrations and sounds from four impacts in the past two years, a development detailed in a study co-authored by Brown planetary scientist Ingrid Daubar.

2022-09-19 ブラウン大学



InSightの地震波・音響波データを用いて火星に新たに形成されたクレーターを特定 Newly formed craters on Mars located using seismic and acoustic wave data from InSight

Raphael F. Garcia,Ingrid J. Daubar,Éric Beucler,Liliya V. Posiolova,Gareth S. Collins,Philippe Lognonné,Lucie Rolland,Zongbo Xu,Natalia Wójcicka,Aymeric Spiga,Benjamin Fernando,Gunnar Speth,Léo Martire,Andrea Rajšić,Katarina Miljković,Eleanor K. Sansom,Constantinos Charalambous,Savas Ceylan,Sabrina Menina,Ludovic Margerin,Rémi Lapeyre,Tanja Neidhart,Nicholas A. Teanby,Nicholas C. Schmerr,Mickaël Bonnin,Marouchka Froment,John F. Clinton,Ozgur Karatekin,Simon C. Stähler,Nikolaj L. Dahmen,Cecilia Durán,Anna Horleston,Taichi Kawamura,Matthieu Plasman,Géraldine Zenhäusern,Domenico Giardini,Mark Panning,Mike Malin & William Bruce Banerdt
Nature Geoscience  Published:19 September 2022

extended data figure 1


Meteoroid impacts shape planetary surfaces by forming new craters and alter atmospheric composition. During atmospheric entry and impact on the ground, meteoroids excite transient acoustic and seismic waves. However, new crater formation and the associated impact-induced mechanical waves have yet to be observed jointly beyond Earth. Here we report observations of seismic and acoustic waves from the NASA InSight lander’s seismometer that we link to four meteoroid impact events on Mars observed in spacecraft imagery. We analysed arrival times and polarization of seismic and acoustic waves to estimate impact locations, which were subsequently confirmed by orbital imaging of the associated craters. Crater dimensions and estimates of meteoroid trajectories are consistent with waveform modelling of the recorded seismograms. With identified seismic sources, the seismic waves can be used to constrain the structure of the Martian interior, corroborating previous crustal structure models, and constrain scaling relationships between the distance and amplitude of impact-generated seismic waves on Mars, supporting a link between the seismic moment of impacts and the vertical impactor momentum. Our findings demonstrate the capability of planetary seismology to identify impact-generated seismic sources and constrain both impact processes and planetary interiors.