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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Association of Ionospheric Signatures to Various Tectonic Parameters During Moderate to Large Magnitude Earthquakes: Case Study
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Association of Ionospheric Signatures to Various Tectonic Parameters During Moderate to Large Magnitude Earthquakes: Case Study

机译：各种协会的电离层签名在温和的大型构造参数级地震:案例研究

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摘要

The sudden ground movement associated with Mw > 6.5 earthquakes is considered a potential source of ionospheric electron density perturbations over the fault region. Coseismic ground displacement is a function of various seismic source parameters such as moment magnitude, focal depth, and focal mechanism etc. We study here the distinct effects of vertical ground displacement, moment magnitude and focal depth on coseismic ionospheric perturbation (CIP) amplitudes during moderate-tolarge earthquakes. We analyze GPS-total electron content variations during 59 dip-slip earthquakes that occurred in the last 20 years. Our study reveals that though CIP amplitudes are primarily controlled by moment magnitude, they are also sensitive to the earthquake focal depth. To understand the influence of focal depth on the displacement field and therefore on CIP amplitudes, we present a simple synthetic test, for a depth range of 0–200 km, highlighting that the maximum vertical ground displacement decreases logarithmically with increasing focal depth while the volume (i.e., integrated vertical ground displacement) of uplifted/subsided material varies very marginally. We conclude that CIP is sensitive to the wavelength of co-seismic vertical displacement field and that seismic energy propagation to the overlying atmosphere during deep earthquakes is not adequate to generate detectable CIP.
机译：突然地面运动与Mw >6.5地震被认为是一个潜在来源电离层电子密度扰动在故障区域。各种地震位移是一个函数源参数如矩震级、震源深度、震源机制等。不同的垂直地面位移的影响,时刻在同震的震级和震源深度电离层扰动振幅在(CIP)moderate-tolarge地震。在59 GPS-total电子内容的变化倾滑地震发生在过去的20年。振幅主要是由时刻控制级,他们也很敏感地震震源深度。震源深度对位移的影响CIP振幅领域,因此,我们现在一个简单的综合测试,深度范围0 - 200公里,强调最大垂直地面位移减少对数震源深度增加而体积(例如,集成垂直地面位移)上升/下降的材料非常不同略。的波长co-seismic垂直的位移场,地震能量传播在整个环境深地震不是足够的生成可探测的CIP。

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