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Pressure Effects on the SEIS‐InSight Instrument, Improvement of Seismic Records, and Characterization of Long Period Atmospheric Waves From Ground Displacements
Journal of Geophysical Research: Planets ( IF 3.9 ) Pub Date : 2020-05-26 , DOI: 10.1029/2019je006278
Raphael F. Garcia 1 , Balthasar Kenda 2 , Taichi Kawamura 2 , Aymeric Spiga 3, 4 , Naomi Murdoch 1 , Philippe Henri Lognonné 2 , Ruldolf Widmer‐Schnidrig 5 , Nicolas Compaire 1 , Guénolé Orhand‐Mainsant 1 , Donald Banfield 6 , William Bruce Banerdt 7
Affiliation  

Mars atmospheric pressure variations induce ground displacements through elastic deformations. The various sensors of the InSight mission were designed in order to be able to understand and correct for these ground deformations induced by atmospheric effects. Particular efforts were made, on one hand, to avoid direct pressure and wind effects on the seismometer and, on the other hand, to have a high performance pressure sensor operating in the same frequency range as the seismometer. As a consequence of these technical achievements and the low background seismic noise of Mars, the InSight mission is opening a new science domain in which the ground displacements can be used to perform atmospheric science. This study presents an analysis of pressure and seismic signals and the relations between them. After a short description of the pressure and seismic sensors, we present an analysis of these signals as a function of local time at the InSight location. Then the coherent signals recorded by both pressure and seismic sensors are described and interpreted in terms of atmospheric signals and ground deformation processes. Two different methods to remove the pressure effects recorded by SEIS sensors are presented, and their efficiency is estimated and compared. These decorrelation methods allow the pressure generated noise to be reduced by a factor of 2 during the active day time period. Finally, an analysis of SEIS signals induced by gravity waves demonstrates the interest of ground displacement measurements to characterize their arrival azimuth.

中文翻译:

SEIS-InSight仪器上的压力效应,地震记录的改进以及来自地面位移的长期大气波的表征

火星的大气压变化通过弹性变形引起地面位移。设计InSight任务的各种传感器是为了能够理解和校正由大气作用引起的地面变形。一方面做出了特别的努力,以避免对地震仪的直接压力和风影响,另一方面,使高性能压力传感器在与地震仪相同的频率范围内工作。由于这些技术成就和火星的低背景地震噪声,InSight任务开辟了一个新的科学领域,在该领域中,地面位移可用于进行大气科学。这项研究提出了压力和地震信号及其之间的关系的分析。在对压力和地震传感器进行简短描述之后,我们将对这些信号进行分析,以作为InSight位置当地时间的函数。然后根据气压信号和地面变形过程描述和解释了由压力传感器和地震传感器记录的相干信号。提出了两种不同的方法来消除SEIS传感器记录的压力影响,并对它们的效率进行估算和比较。这些去相关方法允许在活动的白天时间段内将压力生成的噪声降低2倍。最后,对重力波引起的SEIS信号的分析表明,有必要对地面位移进行测量以表征其到达方位角。我们将这些信号作为InSight位置当地时间的函数进行分析。然后,根据大气信号和地面变形过程描述和解释了由压力传感器和地震传感器记录的相干信号。提出了两种不同的方法来消除SEIS传感器记录的压力影响,并对它们的效率进行估算和比较。这些去相关方法允许在活动的白天时间段内将压力生成的噪声降低2倍。最后,对重力波引起的SEIS信号的分析表明,有必要对地面位移进行测量以表征其到达方位角。我们将这些信号作为InSight位置当地时间的函数进行分析。然后根据气压信号和地面变形过程描述和解释了由压力传感器和地震传感器记录的相干信号。提出了两种不同的方法来消除SEIS传感器记录的压力影响,并对它们的效率进行估算和比较。这些去相关方法允许在活动的白天时间段内将压力生成的噪声降低2倍。最后,对重力波引起的SEIS信号的分析表明,有必要对地面位移进行测量以表征其到达方位角。然后根据气压信号和地面变形过程描述和解释了由压力传感器和地震传感器记录的相干信号。提出了两种不同的方法来消除SEIS传感器记录的压力影响,并对它们的效率进行估算和比较。这些去相关方法允许在活动的白天时间段内将压力生成的噪声降低2倍。最后,对重力波引起的SEIS信号的分析表明,有必要对地面位移进行测量以表征其到达方位角。然后根据气压信号和地面变形过程描述和解释了由压力传感器和地震传感器记录的相干信号。提出了两种不同的方法来消除SEIS传感器记录的压力影响,并对它们的效率进行估算和比较。这些去相关方法允许在活动的白天时间段内将压力生成的噪声降低2倍。最后,对重力波引起的SEIS信号的分析表明,有必要对地面位移进行测量以表征其到达方位角。这些去相关方法允许在活动的白天时间段内将压力产生的噪声降低2倍。最后,对重力波引起的SEIS信号的分析表明,有必要对地面位移进行测量以表征其到达方位角。这些去相关方法允许在活动的一天时间段内将压力生成的噪声降低2倍。最后,对重力波引起的SEIS信号的分析表明,有必要对地面位移进行测量以表征其到达方位角。
更新日期:2020-07-02
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