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Listening for the Landing: Seismic Detections of Perseverance's Arrival at Mars With InSight
Earth and Space Science ( IF 3.1 ) Pub Date : 2021-03-11 , DOI: 10.1029/2020ea001585
Benjamin Fernando 1 , Natalia Wójcicka 2 , Marouchka Froment 3, 4 , Ross Maguire 5, 6 , Simon C. Stähler 7 , Lucie Rolland 8 , Gareth S. Collins 2 , Ozgur Karatekin 9 , Carene Larmat 3 , Eleanor K. Sansom 10 , Nicholas A. Teanby 11 , Aymeric Spiga 12, 13 , Foivos Karakostas 5 , Kuangdai Leng 14 , Tarje Nissen‐Meyer 1 , Taichi Kawamura 4 , Domenico Giardini 7 , Philippe Lognonné 4 , Bruce Banerdt 15 , Ingrid J. Daubar 16
Affiliation  

The entry, descent, and landing (EDL) sequence of NASA's Mars 2020 Perseverance Rover will act as a seismic source of known temporal and spatial localization. We evaluate whether the signals produced by this event will be detectable by the InSight lander (3,452 km away), comparing expected signal amplitudes to noise levels at the instrument. Modeling is undertaken to predict the propagation of the acoustic signal (purely in the atmosphere), the seismoacoustic signal (atmosphere‐to‐ground coupled), and the elastodynamic seismic signal (in the ground only). Our results suggest that the acoustic and seismoacoustic signals, produced by the atmospheric shock wave from the EDL, are unlikely to be detectable due to the pattern of winds in the martian atmosphere and the weak air‐to‐ground coupling, respectively. However, the elastodynamic seismic signal produced by the impact of the spacecraft's cruise balance masses on the surface may be detected by InSight. The upper and lower bounds on predicted ground velocity at InSight are 2.0 × 10−14 and 1.3 × 10−10 m s−1. The upper value is above the noise floor at the time of landing 40% of the time on average. The large range of possible values reflects uncertainties in the current understanding of impact‐generated seismic waves and their subsequent propagation and attenuation through Mars. Uncertainty in the detectability also stems from the indeterminate instrument noise level at the time of this future event. A positive detection would be of enormous value in constraining the seismic properties of Mars, and in improving our understanding of impact‐generated seismic waves.

中文翻译:

倾听着陆:Insight毅力到达火星的地震检测

NASA的“火星2020”恒心漫游车的进入,下降和着陆(EDL)序列将作为已知时空定位的地震源。我们通过比较预期信号幅度与仪器的噪声水平,评估InSight着陆器(距3,452 km)是否可以检测到此事件产生的信号。进行建模以预测声信号(仅在大气中),地震声信号(从大气到地面耦合)和弹性动力地震信号(仅在地面中)的传播。我们的结果表明,由于火星大气中的风型和空地耦合弱,分别由EDL产生的大气冲击波产生的声和地震声信号不太可能被检测到。然而,InSight可以检测到由航天器的巡航平衡质量撞击表面而产生的弹性动力地震信号。InSight的预测地面速度的上限和下限是2.0×10-14和1.3×10 -10  m s -1。平均值在平均降落时间的40%时高于本底噪声。可能的值范围很大,反映了当前对撞击产生的地震波及其随后在火星中传播和衰减的理解方面的不确定性。可检测性的不确定性也源于此未来事件发生时不确定的仪器噪声水平。积极的探测将对限制火星的地震特性,并增进我们对冲击产生的地震波的理解具有巨大的价值。
更新日期:2021-04-02
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