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2 results on '"Posiolova, L.V."'

1. Newly formed craters on Mars located using seismic and acoustic wave data from InSight

Author

Garcia, R.F., Daubar, I.J., Beucler, É., Posiolova, L.V., Collins, G.S., Lognonné, P., Rolland, L., Xu, Z., Wójcicka, N., Spiga, A., Fernando, B., Speth, G., Martire, L., Rajšić, Andrea, Miljković, Katarina, Sansom, Eleanor, Charalambous, C., Ceylan, S., Menina, S., Margerin, L., Lapeyre, R., Neidhart, Tanja, Teanby, N.A., Schmerr, N.C., Bonnin, M., Froment, M., Clinton, J.F., Karatekin, O., Stähler, S.C., Dahmen, N.L., Durán, C., Horleston, A., Kawamura, T., Plasman, M., Zenhäusern, G., Giardini, D., Panning, M., Malin, M., Banerdt, W.B., Garcia, R.F., Daubar, I.J., Beucler, É., Posiolova, L.V., Collins, G.S., Lognonné, P., Rolland, L., Xu, Z., Wójcicka, N., Spiga, A., Fernando, B., Speth, G., Martire, L., Rajšić, Andrea, Miljković, Katarina, Sansom, Eleanor, Charalambous, C., Ceylan, S., Menina, S., Margerin, L., Lapeyre, R., Neidhart, Tanja, Teanby, N.A., Schmerr, N.C., Bonnin, M., Froment, M., Clinton, J.F., Karatekin, O., Stähler, S.C., Dahmen, N.L., Durán, C., Horleston, A., Kawamura, T., Plasman, M., Zenhäusern, G., Giardini, D., Panning, M., Malin, M., and Banerdt, W.B.

Abstract

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.

Published
2022

2. Largest recent impact craters on Mars: Orbital imaging and surface seismic co-investigation

Author

Posiolova, L.V., Lognonné, P., Banerdt, W.B., Clinton, J., Collins, G.S., Kawamura, T., Ceylan, S., Daubar, I.J., Fernando, B., Froment, M., Giardini, D., Malin, M.C., Miljković, Katarina, Stähler, S.C., Xu, Z., Banks, M.E., Beucler, Cantor, B.A., Charalambous, C., Dahmen, N., Davis, P., Drilleau, M., Dundas, C.M., Durán, C., Euchner, F., Garcia, R.F., Golombek, M., Horleston, A., Keegan, C., Khan, A., Kim, D., Larmat, C., Lorenz, R., Margerin, L., Menina, S., Panning, M., Pardo, C., Perrin, C., Pike, W.T., Plasman, M., Rajšić, Andrea, Rolland, L., Rougier, E., Speth, G., Spiga, A., Stott, A., Susko, D., Teanby, N.A., Valeh, A., Werynski, A., Wójcicka, N., Zenhäusern, G., Posiolova, L.V., Lognonné, P., Banerdt, W.B., Clinton, J., Collins, G.S., Kawamura, T., Ceylan, S., Daubar, I.J., Fernando, B., Froment, M., Giardini, D., Malin, M.C., Miljković, Katarina, Stähler, S.C., Xu, Z., Banks, M.E., Beucler, Cantor, B.A., Charalambous, C., Dahmen, N., Davis, P., Drilleau, M., Dundas, C.M., Durán, C., Euchner, F., Garcia, R.F., Golombek, M., Horleston, A., Keegan, C., Khan, A., Kim, D., Larmat, C., Lorenz, R., Margerin, L., Menina, S., Panning, M., Pardo, C., Perrin, C., Pike, W.T., Plasman, M., Rajšić, Andrea, Rolland, L., Rougier, E., Speth, G., Spiga, A., Stott, A., Susko, D., Teanby, N.A., Valeh, A., Werynski, A., Wójcicka, N., and Zenhäusern, G.

Abstract

Two >130-meter-diameter impact craters formed on Mars during the later half of 2021. These are the two largest fresh impact craters discovered by the Mars Reconnaissance Orbiter since operations started 16 years ago. The impacts created two of the largest seismic events (magnitudes greater than 4) recorded by InSight during its 3-year mission. The combination of orbital imagery and seismic ground motion enables the investigation of subsurface and atmospheric energy partitioning of the impact process on a planet with a thin atmosphere and the first direct test of martian deep-interior seismic models with known event distances. The impact at 35°N excavated blocks of water ice, which is the lowest latitude at which ice has been directly observed on Mars.

Published
2022

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