Detection of seismic events on Mars: a lunar perspective

Detection of seismic events on Mars: a lunar perspective
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探测火星地震事件:月球视角

DOI:
10.26464/epp2019030
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发表时间:
2019-07
影响因子:
2.9
通讯作者:
Fu Li-Yun
Fu Li-Yun
中科院分区:
地球科学4区
文献类型:
--
作者:
Sun Weijia;Zhao L.;Wei Y.;Fu Li-Yun

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行星的内部结构正引起越来越详细的关注;这些研究可能对提高我们对地球早期演化的理解具有重要价值。行星内部的地震学研究主要依靠地震事件激发的地震波。由于其他行星上的构造活动要弱得多,例如火星,它们的地震事件的震级比地球上的要小得多。因此,使用诸如短时间平均/长时间平均(STA/LTA)触发等常规技术来探测行星上的地震事件是一个挑战。为了寻求在不久的将来探测火星上小震级事件的有效和稳健的方案,我们以阿波罗月球地震观测为例,开发了一种事件探测方案。本文提出的方法实际上是一种分两步处理的方法:第一步采用去派克滤波器去除温度变化较大时产生的大幅度脉冲;第二步采用匹配滤波器来揭开隐藏在环境和散射噪声中的微弱事件的地震信号。该方案已成功地用于探测一次已知的月球地震目录中没有的月球地震,证明了两步法是探测行星上地震事件的一种可行方法。我们的方案将为利用地震调查、大地测量和热量传输(INSPOT)任务以及中国未来的月球任务进行内部探测的地震数据分析提供强大的工具。
The interior structures of planets are attracting more and more detailed attention; these studies could be of great value in improving our understanding of the early evolution of Earth. Seismological investigations of planet interiors rely primarily on seismic waves excited by seismic events. Since tectonic activities are much weaker on other planets, e.g. Mars, the magnitudes of their seismic events are much smaller than those on Earth. It is therefore a challenge to detect seismic events on planets using such conventional techniques as short‐time average/long‐time average (STA/LTA) triggers. In pursuit of an effective and robust scheme to detect small‐magnitude events on Mars in the near future, we have taken Apollo lunar seismic observations as an example of weak‐activity data and developed an event‐detection scheme. The scheme reported here is actually a two‐step processing approach: the first step involves a despike filter to remove large‐amplitude impulses arising from large temperature variations; the second step employs a matched filter to unmask the seismic signals from a weak event hidden in the ambient and scattering noise. The proposed scheme has been used successfully to detect a moonquake that was not in the known moonquake catalogue, demonstrating that the two‐step strategy is a feasible method for detecting seismic events on planets. Our scheme will provide a powerful tool for seismic data analysis of the Interior Exploration using Seismic Investigations, Geodesy and Heat Transport (InSight) mission, and China’s future lunar missions.
DOI: --
发表时间: 1979
期刊: --
影响因子: --
作者:
Yosio Nakamura;G. Latham;H. Dorman;A. K. Ibrahim;J. Koyama;P. Horváth
通讯作者: Yosio Nakamura;G. Latham;H. Dorman;A. K. Ibrahim;J. Koyama;P. Horváth
DOI: 10.1029/1999gl008452
发表时间: 2000-06
影响因子: 5.2
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Amir Khan;K. Mosegaard;Kaare Lund Rasmussen
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DOI: 10.1029/2004je002332
发表时间: 2005-01-18
影响因子: 4.8
作者:
Nakamura, Y
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DOI: 10.1029/94jb00498
发表时间: 1994-07
影响因子: --
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P. Shearer
通讯作者: P. Shearer
DOI: 10.15781/t2ff3mh78
发表时间: 1981
期刊: --
影响因子: --
作者:
Yosio Nakamura;G. Latham;H. Dorman;J. Harris
通讯作者: Yosio Nakamura;G. Latham;H. Dorman;J. Harris