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首页> 外文期刊>Journal of Asian earth sciences >Particle precipitation prior to large earthquakes of both the Sumatra and Philippine Regions: A statistical analysis
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Particle precipitation prior to large earthquakes of both the Sumatra and Philippine Regions: A statistical analysis

机译：苏门答腊和菲律宾大地震之前的颗粒降水：统计分析

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摘要

A study of statistical correlation between low L-shell electrons precipitating into the atmosphere and strong earthquakes is presented. More than 11 years of the Medium Energy Protons Electrons Detector data from the NOAA-15 Sun-synchronous polar orbiting satellite were analysed. Electron fluxes were analysed using a set of adiabatic coordinates. From this, significant electron counting rate fluctuations were evidenced during geomagnetic quiet periods. Electron counting rates were compared to earthquakes by defining a seismic event L-shell obtained radially projecting the epicentre geographical positions to a given altitude towards the zenith. Counting rates were grouped in every satellite semi-orbit together with strong seismic events and these were chosen with the L-shell coordinates close to each other. NOAA-15 electron data from July 1998 to December 2011 were compared for nearly 1800 earthquakes with magnitudes larger than or equal to 6, occurring worldwide. When considering 30100 keV precipitating electrons detected by the vertical NOAA-15 telescope and earthquake epicentre projections at altitudes greater that 1300 km, a significant correlation appeared where a 2-3 h electron precipitation was detected prior to large events in the Sumatra and Philippine Regions. This was in physical agreement with different correlation times obtained from past studies that considered particles with greater energies. The Discussion below of satellite orbits and detectors is useful for future satellite missions for earthquake mitigation. (c) 2015 Elsevier Ltd. All rights reserved.
机译：提出了低L壳电子向大气中沉淀与强地震之间的统计相关性研究。分析了超过11年的NOAA-15太阳同步极地轨道卫星的中能质子电子探测器数据。使用一组绝热坐标分析电子通量。由此可见，在地磁静默期有明显的电子计数率波动。通过定义地震事件L壳层，将电子计数率与地震进行比较，该L壳层是沿径向将震中地理位置投影到给定高度的最高点。在每个卫星半轨道中，将计数率与强地震事件一起分组，并在L壳坐标彼此接近的情况下进行选择。对1998年7月至2011年12月的NOAA-15电子数据进行了比较，比较了世界范围内发生的近1800次地震，震级大于或等于6。当考虑用垂直NOAA-15望远镜和海拔超过1300 km的地震震中投影探测到的30100 keV降水电子时，在苏门答腊和菲律宾大事件之前检测到2-3 h电子降水出现了显着的相关性。这与从过去的研究中获得的具有不同相关时间的物理观点一致，以往的研究考虑了具有更大能量的粒子。下面有关卫星轨道和探测器的讨论对于减轻地震的未来卫星任务很有用。 （c）2015 Elsevier Ltd.保留所有权利。

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