GPS Seismology for a moderate magnitude earthquake: Lessons learned from the analysis of the 31 October 2013 ML 6.4 Ruisui (Taiwan) earthquake
GPS Seismology for a moderate magnitude earthquake: Lessons learned from the analysis of the 31 October 2013 ML 6.4 Ruisui (Taiwan) earthquake
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DOI：
10.4401/ag-7399
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发表时间：
2017-01-01
影响因子：
1
通讯作者：
Crespi, Mattia
中科院分区：
文献类型：
--
作者：
Hung, Huang-Kai;Rau, Ruey-Juin;Crespi, Mattia
2013年10月31日瑞穗M-L 6.4级地震由12个50 Hz、4个20 Hz和13个1 Hz GPS接收器以及位于台湾东部90 km震中范围内的25个强震台站记录。使用四种GNSS软件（TRACK、RTKLIB、GIPSY、VADASE）估计的运动定位解来推导本次地震的地震波形和同震位移;使用强震加速度计来验证高速率GPS检测本次地震产生的地震波的能力。结果表明，经过空间滤波后，GPS位移时间序列的水平分量和垂直分量的坐标重复性分别接近6 mm和20 mm标准差。由高速率GPS得到的最大同震位移在震中东北方向5 km处接近15 cm。利用高速率GPS和双积分加速度计的运动，在15 km的震中范围内成功地探测到了S波和面波。首次在台湾使用和分析了12个50 Hz和4个20 Hz的GPS观测数据进行地震学研究;相对于1 Hz的GPS数据，在地震波特征检测方面证明了明显的好处，因此，超高速率（> 1 Hz）观测可以补偿地震数据的稀疏覆盖，只要GPS永久站实现适当的纪念碑。共址GPS和强震数据之间的谱分析进一步表明，高速率GPS地震研究的最佳采样率为5 Hz。2013年台湾瑞穗地震由台湾的高速率GPS永久台站网络记录，证明了GPS地震学在局部尺度上对中等规模地震的好处。
The 31 October 2013 M-L 6.4 Ruisui earthquake was well recorded by twelve 50-Hz, four 20-Hz and thirteen 1-Hz GPS receivers, and twenty-five strong motion stations located within the epicentral distance of 90 km in eastern Taiwan. Kinematic positioning solutions estimated by four GNSS software (TRACK, RTKLIB, GIPSY, VADASE) are used to derive the seismic waveforms and the co-seismic displacements for this event; strong motion accelerometers are used to verify the capability of high rate GPS to detect seismic waves generated by this earthquake. Results show that the coordinate repeatability of the GPS displacements time series are similar to 6 mm and similar to 20 mm standard deviation in the horizontal and vertical components respectively, after applying spatial filtering. The largest co-seismic displacement derived from high-rate GPS is nearly 15 centimeter at 5 km northeast of the epicenter. S waves and surface waves are successfully detected by motions of high-rate GPS and double-integrated accelerometers within the 15 km epicentral distance. For the first time twelve 50-Hz and four 20 Hz GPS observations for seismological study were used and analyzed in Taiwan; a clear benefit was evidenced with regard to the seismic waves features detection, with respect to the 1-Hz GPS data, so that ultra-high rate (> 1-Hz) observations can compensate the sparse coverage of seismic data, provided proper monuments for the GPS permanent stations are realized. Spectra analysis between co-located GPS and strong motion data further suggests that the optimal sampling rate for high-rate GPS Seismology study is 5 Hz. The 2013 Ruisui Taiwan earthquake recorded by the high-rate GPS permanent stations network in Taiwan demonstrates the benefits of GPS Seismology for a moderate size earthquake at a local scale.