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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Coseismic Traveling Ionospheric Disturbances during the M_w 7.8 Gorkha, Nepal, Earthquake on 25 April 2015 From Ground and Spaceborne Observations
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Coseismic Traveling Ionospheric Disturbances during the M_w 7.8 Gorkha, Nepal, Earthquake on 25 April 2015 From Ground and Spaceborne Observations

机译：同震的旅行电离层扰动7.8在M_w廓尔喀、尼泊尔、地震2015年4月25日从地面和太空观察

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摘要

Coseismic traveling ionospheric disturbances (CTIDs) and their propagation characteristics during M_w 7.8 Gorkha earthquake in Nepal on 25 April 2015 have been investigated using a suite of ground-based GPS receivers and broadband seismometers along with the spaceborne radio occultation observations over the Indian subcontinent region. Depletion in vertical total electron content, a so called ionospheric hole, is observed near the epicenter ~9–11 min after the onset of earthquake. A positive pulse preceding the depletion, similar to N-shaped perturbation, propagating with an apparent velocity of ~2.4 km/s is observed on the south. Further, the CTIDs in the southward direction are found to split in to fast (~2.4–1.7 km/s) and slow (~680–520 m/s) propagating modes at epicentral distances greater than ~800 km. However, the velocities of fast mode CTIDs are significantly smaller than the surface Rayleigh wave velocity (~3.7 km/s), indicating that they are not the true imprint of Rayleigh wave, instead, can probably be attributed to the superimposed wave front formed by the mixture of acoustic waves excited by main shock and propagating Rayleigh wave. The southward CTIDs are found to propagate at F_2 region altitudes of ~300–440 km captured by Constellation Observing System for Meteorology, Ionosphere and Climate radio occultation observations. The CTIDs with periods of ~4–6 min are observed in all directions with significantly larger amplitudes and faster propagation velocities in south and east directions. The observed azimuthal asymmetry in the amplitudes and velocities of CTIDs are discussed in terms of the alignment with geomagnetic field and nature of surface crustal deformation during the earthquake.
机译：同震的旅行电离层扰动(CTIDs)及其传播特性25日在尼泊尔廓尔喀地震期间M_w 7.82015年4月使用一套进行了调查地面GPS接收器和宽带地震检波器以及星载收音机在印度掩星观测次大陆地区。电子内容,所谓的电离层洞,观察到震中附近~ 9 - 11分钟后地震的发生。之前的损耗,N-shaped相似微扰,传播明显~ 2.4公里/秒的速度上观察到南方。此外,CTIDs向南方向发现在快速分裂(-1.7 ~ 2.4公里/秒)慢(~ 680 - 520 m / s)传播模式震中距离大于~ 800公里。然而,快速模式CTIDs的速度明显小于表面瑞利波速(~ 3.7 km / s),表明他们不是真正的瑞利波的印记,相反,可能是由于叠加的混合形成的波前声波主要震惊和兴奋瑞利波传播。发现传播₂地区海拔被观察星座~ 300 - 440公里系统对气象学、电离层和气候无线电掩星观测。~ 4 - 6分钟的时间观察方向明显更大的振幅在南,和更快的传播速度东的方向。CTIDs振幅和速度的讨论的对齐地磁场和地壳表面的性质在地震形变。

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