火星浅层限制波速

IF 2.6 3区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS
Eunbi Mun, Byungmin Kim
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引用次数: 0

摘要

利用地震调查、大地测量学和热传输(InSight)进行的内部探测在火星的极乐世界平原着陆。洞察号有一个内部结构地震实验(SEIS),其中包含地震仪,记录了许多火星地震的地震图。在这项研究中,我们通过分析6次火星地震的P波地震记录的初始部分和入射角,提出了InSight着陆点的剪切(S)波速(VS)和压缩(P)波速(VP)剖面。采集高质量的低频地震记录。使用p波地震记录方法,该方法在地球上的各个地区都得到了验证,我们估计了深度为3400 m的VS值。此外,我们还根据初始纵波振幅在径向与垂直方向的比值计算了顶层纵波的入射角。通过假设VP剖面,我们估计了其他层的纵波入射角以及震中距离。最后,我们提出了一个深度为3400 m的VP剖面,以最大限度地减少估计和已知震中距离之间的不匹配。我们确认所提出的VS和VP剖面与先前的研究一致。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Constraining Wave Velocities for Shallow Depths on Mars
ABSTRACT Interior Exploration using Seismic Investigations, Geodesy, and Heat Transport (InSight) landed on Mars on the Elysium Planitia. The InSight had a Seismic Experiment for Internal Structure (SEIS), which contained seismometers that recorded numerous marsquake seismograms. In this study, we propose shear (S)-wave velocity (VS) and compression (P)-wave velocity (VP) profiles at the InSight landing site on Mars by analyzing the initial portions of P-wave seismograms and incidence angles of the six marsquakes. High-quality, low-frequency seismograms are collected. Using the P-wave seismogram method, which is validated for various regions on Earth, we estimate VS values up to a depth of 3400 m. In addition, we compute the incidence angle of the P-wave for the top layer based on the ratio of the initial P-wave amplitude in the radial direction to that in the vertical direction. By hypothesizing the VP profile, we estimate the incidence angles of the P-wave for the other layers, as well as the epicentral distances. Finally, we propose a VP profile up to a depth of 3400 m that minimizes the misfit between the estimated and known epicentral distances. We confirm that the proposed VS and VP profiles agree with those of previous studies.
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来源期刊
Bulletin of the Seismological Society of America
Bulletin of the Seismological Society of America 地学-地球化学与地球物理
CiteScore
5.80
自引率
13.30%
发文量
140
审稿时长
3 months
期刊介绍: The Bulletin of the Seismological Society of America, commonly referred to as BSSA, (ISSN 0037-1106) is the premier journal of advanced research in earthquake seismology and related disciplines. It first appeared in 1911 and became a bimonthly in 1963. Each issue is composed of scientific papers on the various aspects of seismology, including investigation of specific earthquakes, theoretical and observational studies of seismic waves, inverse methods for determining the structure of the Earth or the dynamics of the earthquake source, seismometry, earthquake hazard and risk estimation, seismotectonics, and earthquake engineering. Special issues focus on important earthquakes or rapidly changing topics in seismology. BSSA is published by the Seismological Society of America.
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