Renewed Epicentral Distribution of Low Frequency Marsquakes by Varying‐Parameter Polarization Analysis of InSight Data
Renewed Epicentral Distribution of Low Frequency Marsquakes by Varying‐Parameter Polarization Analysis of InSight Data
复制标题
通过 InSight 数据的变参数极化分析更新低频火星地震的震中分布
DOI：
10.1029/2023gl103896
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发表时间：
2023
影响因子：
5.2
通讯作者：
Xin Wang
中科院分区：
文献类型：
--
作者：
Xu Wang;Ling Chen;Xin Wang
关于火星地震位置的准确信息对于了解火星的构造活动、地下结构和动力学至关重要。我们设计了一个变参数的偏振分析方案，以确定marsquakes的后方位角。对于两个火星陨石撞击事件，从轨道图像中已知地面真实位置，我们的方案产生的后方位角比以前报道的更接近真实值0.55 °和0.14 °，证明了我们的方法在约束后方位角方面的优势。我们应用这种方法确定了44个低频地震的后方位角，并可靠地重新定位了39个。这些大地震中有近一半发生在刻耳柏鲁斯槽沟，其余的分布广泛，包括沿着二分法边界以及北方低地和南部高地内。虽然需要进一步的研究来了解这些地震的机制，但广泛的地震活动意味着今天的火星，特别是古老的南部高地，比以前认为的更活跃。
Accurate information about marsquake locations is crucial for understanding the tectonic activity, subsurface structures, and dynamics of Mars. We designed a varying‐parameter scheme for polarization analysis to determine the back‐azimuths of marsquakes. For two Martian meteorite impact events with ground‐truth locations known from orbital images, our scheme yields back‐azimuths that are ∼5° and ∼14° closer to the true values than those reported previously, demonstrating our method's advantages in constraining back‐azimuths. We applied this method to determine the back‐azimuths of 44 Low Frequency marsquakes and 39 were reliably relocated. Nearly half of these marsquakes occur in Cerberus Fossae, while the rest are broadly distributed, including along the dichotomy boundary and within the northern lowlands and southern highlands. Although further studies are required to understand the mechanisms of these marsquakes, the widespread seismicity implies that present‐day Mars, especially the ancient southern highlands, is more tectonically active than previously thought.
影响因子：
3.2
作者：
Ivanov, Mikhail A.;Hiesinger, H.;Reiss, D.
通讯作者：
Reiss, D.