Precise Positioning of BDS, BDS/GPS: Implications for Tsunami Early Warning in South China Sea
Precise Positioning of BDS, BDS/GPS: Implications for Tsunami Early Warning in South China Sea
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北斗、北斗/GPS精准定位：对南海海啸预警的意义
DOI：
10.3390/rs71215814
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发表时间：
2015-12-01
期刊：
影响因子：
5
通讯作者：
Ge, Maorong
中科院分区：
文献类型：
--
作者：
Chen, Kejie;Zamora, Natalia;Ge, Maorong
全球定位系统（GPS）已被证明是一种强有力的工具，用于测量同震地面位移，并应用于震源反演。尽管大多数海啸都是由大地震引发的，但GPS可以通过帮助近实时获取海啸源参数来为海啸预警系统（TEWS）做出贡献。2012年底，北斗导航卫星系统星座第二阶段完成，北斗导航卫星系统自此开始提供区域定位服务。数值结果表明，目前北斗系统的精度与GPS相当。与单一的全球卫星导航系统（GNSS）相比，BDS/GPS组合实时处理可以提高同震位移反演的精度，尤其是可靠性。在本研究中，我们调查的潜力，BDS服务于中国南海地区的海啸预警系统。为了促进该地区的海啸预警和预报能力，我们建议沿着吕宋岛（菲律宾）分布一系列BDS站。通过模拟一个在马尼拉海沟的Mw = 8的地震为例，我们表明，这样的阵列将能够检测地震参数在真实的时间具有很高的精度，因此，有助于在该地区的快速和可靠的海啸预警系统。
Global Positioning System (GPS) has been proved to be a powerful tool for measuring co-seismic ground displacements with an application to seismic source inversion. Whereas most of the tsunamis are triggered by large earthquakes, GPS can contribute to the tsunami early warning system (TEWS) by helping to obtain tsunami source parameters in near real-time. Toward the end of 2012, the second phase of the BeiDou Navigation Satellite System (BDS) constellation was accomplished, and BDS has been providing regional positioning service since then. Numerical results indicate that precision of BDS nowadays is equivalent to that of the GPS. Compared with a single Global Satellite Navigation System (GNSS), combined BDS/GPS real-time processing can improve accuracy and especially reliability of retrieved co-seismic displacements. In the present study, we investigate the potential of BDS to serve for the early warning system of tsunamis in the South China Sea region. To facilitate early warnings of tsunamis and forecasting capabilities in this region, we propose to distribute an array of BDS-stations along the Luzon Island (Philippines). By simulating an earthquake with Mw = 8 at the Manila trench as an example, we demonstrate that such an array will be able to detect earthquake parameters in real time with a high degree of accuracy and, hence, contribute to the fast and reliable tsunami early warning system in this region.