GNSS seismometer: Seismic phase recognition of real-time high-rate GNSS deformation waves
GNSS seismometer: Seismic phase recognition of real-time high-rate GNSS deformation waves
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GNSS 地震仪：实时高速 GNSS 形变波的地震相位识别
DOI：
10.1016/j.jappgeo.2016.10.026
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发表时间：
2016-12-01
影响因子：
2
通讯作者：
Lin, Mu
中科院分区：
文献类型：
--
作者：
Nie, Zhaosheng;Zhang, Rui;Lin, Mu
高速率全球导航卫星系统（GNSS）有可能被用作地震检波器，以捕捉地震产生的短周期瞬时动态变形波。然而，在GNSS地震学中发挥重要作用的实时模式下的GNSS地震仪的性能和地震相位识别仍然存在不确定性。通过对比振动台试验实时解的准确度和精密度结果，发现实时解与后处理解一致，且与采样率无关。此外，我们还分析了振动台试验实时解和近期大地震的时间序列。结果表明，高速率GNSS能够检索包括P波、S波、洛夫波和瑞利波在内的大多数类型的地震波。限制其记录地震相位性能的主要因素是广泛使用的1hz采样率。噪声本底也使一些弱地震相的识别变得困难。我们认为，地震波的传播速度和路径、高速率GNSS阵列的宏观特征、地震相位的空间轨迹以及地震仪的结合都有助于从高速率GNSS时间序列中检索地震相位。(C) 2016 Elsevier B.V.版权所有
High-rate global navigation satellite systems (GNSS) can potentially be used as seismometers to capture short-period instantaneous dynamic deformation waves from earthquakes. However, the performance and seismic phase recognition of the GNSS seismometer in the real-time mode, which plays an important role in GNSS seismology, are still uncertain. By comparing the results of accuracy and precision of the real-time solution using a shake table test, we found real-time solutions to be consistent with post-processing solutions and independent of sampling rate. In addition, we analyzed the time series of real-time solutions for shake table tests and recent large earthquakes. The results demonstrated that high-rate GNSS have the ability to retrieve most types of seismic waves, including P-, S-, Love, and Rayleigh waves. The main factor limiting its performance in recording seismic phases is the widely used 1-Hz sampling rate. The noise floor also makes recognition of some weak seismic phases difficult. We concluded that the propagation velocities and path of seismic waves, macro characteristics of the high-rate GNSS array, spatial traces of seismic phases, and incorporation of seismographs are all useful in helping to retrieve seismic phases from the high-rate GNSS time series. (C) 2016 Elsevier B.V. All rights reserved.