Component azimuths of the CEArray stations estimated from P-wave particle motion

Component azimuths of the CEArray stations estimated from P-wave particle motion
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根据 P 波粒子运动估计的 CEArray 站的分量方位角

DOI:
10.1007/s11589-011-0764-8
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发表时间:
2011-02
期刊:
影响因子:
1.2
通讯作者:
--
中科院分区:
地球科学4区
文献类型:
--
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最近建成的中国数字地震台网由中国国家数字地震台网(CNDSN)、31个区域地震台网和多个小孔径台阵组成,拥有1000多个台站,其中包括850多个宽带台站。它形成了一个巨大的地震阵列,除了常规的地震监测任务外,还为研究地球深部提供了前所未有的机会。许多现代地震研究依赖于垂直和水平分量的旋转,以分离不同类型的地震波。因此,了解两个水平分量的取向对于执行校正旋转是重要的。我们分析了由网络记录的P-P波的质点运动,并利用它们来估计每个台站的北向分量方位角。引入SNR加权多同相轴方法,得到最能解释同一台站记录的所有同相轴的P波质点运动的分量方位角。该方法提供了稳健的估计,包括从背景噪声水平计算的测量误差。我们发现,大约三分之一的台站存在某种问题,包括两个水平分量的方向错误,一个或多个分量的错误标记和极性反转。任何基于旋转的地震研究都需要考虑这些问题。
The recently built China Digital Seismic Network consists of the China National Digital Seismic Network (CNDSN), 31 regional seismic networks and several small aperture arrays with more than 1 000 stations including 850+ broadband stations. It forms a gigantic seismic array that provides an unprecedented opportunity to study the Earth’s deep interior besides its routine task of seismic monitoring. Many modern seismic studies rely on rotation of vertical and horizontal components in order to separate different types of seismic waves. Knowledge of the orientations of the two horizontal components thus is important to perform a correction rotation. We analyzed particle motions of teleseismic P waves recorded by the network and used them to estimate the north-component azimuth of each station. An SNR-weighted-multi-event method was introduced to obtain component azimuths that best explain the P-wave particle motions of all the events recorded at a station. The method provides robust estimates including a measurement error calculated from background noise levels. We found that about one third of the stations have some sort of problems, including misorientation of the two horizontal components, mislabeling and polarity reversal in one or more components. These problems need to be taken into account for any rotation based seismic studies.
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