WDC for Geophysics, Beijing(中国地球物理学科中心)

Author-submitted data information

ID 211
Title Distinct slab interfaces imaged within the mantle transition zone
Creator Xin Wang
Subject Seismic receiver function waveform data
Publisher Xiukuan Zhao
Description To understand the upper mantle structures in northeast China, we collect seismic data from 313 regional seismic stations in northeast China to conduct Receiver Function (RF) study. The 313 regional broadband seismic stations belong to three seismic arrays: (1) 58 temporary stations from the NorthEast China Seismic Array to Investigate Deep Subduction (NECsaids) during 09/2009 and 12/2014, (2) 127 temporary stations from the NorthEast China Extended SeiSimc Array (NECESSArray, https://doi.org/10.7914/SN/YP_2009) between 09/2009 and 10/2010, and (3) 128 permanent stations from the China Earthquake Administration array (CEA, doi: 10.11998/SeisDmc/SN, http://www.seisdmc.ac.cn) between 07/2007 and 12/2014. For our RF analysis, we first acquired the teleseismic waveform data for earthquakes with magnitude larger than 5.2 and epicentral distances ranging from 30° to 90°. The three-component seismograms were then rotated into radial, transverse, and vertical components, windowed around the theoretical first P arrivals (-50 sec to 150 sec) and filtered with a bandpass filter of 0.02 – 2.0 Hz. We obtained the RF by deconvolving the vertical component from the radial component using a time-domain iterative deconvolution technique with Gaussian low-pass filter. The Gaussian parameter (a) is varied from a=0.5/0.75/1.0/1.5 (roughly corresponding to the corner frequency of 0.25/0.35/0.5/0.7 Hz) to conduct the frequency-dependent RF analysis. After the deconvolution, careful visual inspection is further conducted to remove bad traces with low coherence. Finally, the number of selected high-quality RFs is 67344 (in each frequency bands). The final RF waveform files are stored in the directories as: ./DeconvFrequency/station/YYYYMMDD_HHMM.network.station.eqr (e.g., /Deconv0.5/EN09/ 20121210_1653.DB.EN09.eqr). Earthquake information can be found on the USGS website (https://earthquake.usgs.gov/earthquakes/search/).
Contributor Xin Wang, Qi-Fu Chen, Fenglin Niu, Shengji Wei, Jieyuan Ning, Juan Li, Weijun Wang, Johannes Buchen, Lijun Liu
Date NorthEast China Seismic Array to Investigate Deep Subduction (NECsaids) between 09/2009 and 12/2014; NorthEast China Extended SeiSimc Array (NECESSArray) between 09/2009 and 10/2010; China Earthquake Administration array (CEA) between 07/2007 and 12/2014
Type The Receiver Functions (RF) are stored with a sampling rate of 20 Hz and a length of 140 sec (-20 sec to 120 sec). The time zero refers to the direct P-wave.
Format .eqr (standard SAC format, can be read directly using sac, Obspy, MATLAB, et al.,)
URL http://www.geophys.ac.cn/ArticleData/20200811Wang_2020NG.zip
DOI 10.12197/2020GA012
Language eng
Rights Institute of Geology and Geophysics, Chinese Academy of Sciences