Searching the InSight Seismic Data for Mars’s Background-Free Oscillations

Cecilia Durán,Amir Khan, Johannes Kemper,Iris Fernandes,Klaus Mosegaard,Jeroen Tromp, Marion Dugué,David Sollberger,Domenico Giardini

Seismological Research Letters（2024）

1Institute of Geophysics | 4Department of Geosciences | 5Mondaic AG

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Abstract

Abstract Mars’s atmosphere has theoretically been predicted to be strong enough to continuously excite Mars’s background-free oscillations, potentially providing an independent means of verifying radial seismic body-wave models of Mars determined from marsquakes and meteorite impacts recorded during the Interior Exploration using Seismic Investigations, Geodesy, and Heat Transport (InSight) mission. To extract the background-free oscillations, we processed and analyzed the continuous seismic data, consisting of 966 Sols (a Sol is equivalent to a Martian day), collected by the Mars InSight mission using both automated and manual deglitching schemes to remove nonseismic disturbances. We then computed 1-Sol-long autocorrelations for the entire data set and stacked these to enhance any normal-mode peaks present in the spectrum. We find that while peaks in the stacked spectrum in the 2–4 mHz frequency band align with predictions based on seismic body-wave models and appear to be consistent across the different processing and stacking methods applied, unambiguous detection of atmosphere-induced free oscillations in the Martian seismic data nevertheless remains difficult. This possibly relates to the limited number of Sols of data that stack coherently and the continued presence of glitch-related signal that affects the seismic data across the normal-mode frequency range (∼1–10 mHz). Improved deglitching schemes may allow for clearer detection and identification in the future.

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【要点】：本文通过分析火星InSight任务的连续地震数据，探索火星无背景振荡，为验证火星径向地震体波模型提供了独立方法。

【方法】：利用自动和手动去干扰技术处理966个火星日的连续地震数据，并计算了1个火星日长的自相关函数，进行叠加以增强频谱中的正常模式峰值。

【实验】：通过对InSight任务收集的地震数据进行处理和分析，研究了2-4 mHz频段内的频谱峰值，尽管与理论预测相符，但由于数据堆叠的一致性有限和干扰信号的持续存在，大气引起的自由振荡的明确检测仍然困难。