Chinese Geophysical Data Center, World Data Center. 世界数据中心 中国地球物理分中心
 
   

Author-submitted data information


ID 301
Title Single- and two-station Lg amplitude data obtained from CENC (China Earthquake Network Center) and IRIS (Incorporated Research Institutions for Seismology)
Creator Xi He
Subject Single-station amplitudes and two-station amplitudes ratios of Lg-wave
Publisher Xiukuan Zhao
Description To explore the crustal Lg-wave attenuation and its implications into regional crustal deformations in Southeast Tibet, we collected the vertical components waveforms of 622 crustal earthquakes occurring in Southeast Tibet during January 1991 and August 2017 with magnitudes between 4.1 and 6.5 and recorded at 226 CENC stations and 197 IRIS stations, and performed a Lg attenuation tomography based on the single- and two-station Lg amplitude data. To obtain the spectral Lg amplitudes, we extracted the Lg waveform within the 3.6-3.0 km/s velocity window, calculated the Fourier spectra and corrected for noises using the pre-P recordings. The single-station Lg amplitudes were selected based on both the pre-event and pre-phase signal-to-noise ratio thresholds of 2.0 and 1.0, respectively. The two-station Lg amplitude ratios were calculated for the roughly aligned triples of event and station-pair. The resulting single-station amplitudes and two-station amplitude ratios were provided in this Data Repository.
Contributor Xi He, Lian-Feng Zhao, Xiao-Bi Xie, Xiaobo Tian, Zhen-Xing Yao
Date January 1991 - August 2017
Type The Lg amplitudes were sampled at 58 frequencies distributed log-evenly between 0.05 and 10.0 Hz, and therefore the spectral Lg amplitude data were provided in 58 separated files, with each file corresponding to one frequency indicated by the double-digit number in the name of the file.
Format All Lg amplitude data, including single-station amplitudes and two-station amplitude ratios, were stored in the ASCII sott.*.dat files. The correspondence between the frequency and the double-digit number can be looked up in the file ‘frequency.txt’. The sott.*.dat files consist of header lines and data lines. Zero value in 5th column indicates that the current line is the header line for single-station data, with the first two columns being the longitude and latitude of the recorded event, 3rd column being the number of lines of the following data and 4th column the sequence number of the recorded event. The header lines for single-station data are immediately followed by lines of single-station data, with the columns successively being the longitude and latitude of the recording station, Lg amplitude, geometric spreading term, sequence number of the recording station and the magnitude of the recorded event. Zero value in 4th column indicates that the current line is the header line for two-station data, with the first two columns being the longitude and latitude of the recording station, 3rd column being the number of lines of the following data and 4th column the sequence number of the recording station. The header lines for two-station data are immediately followed by lines of two-station data, with the columns successively being the longitude and latitude of the in-between station, inter-station ratio of Lg amplitude, geometric spreading term, sequence number of the in-between station and the magnitude of the recorded event.
URL http://www.geophys.ac.cn/ArticleData/20210122Southeast_Tibet_Lg_Amplitudes.zip
DOI 10.12197/2021GA002
Source
Language eng
Relation
Coverage
Rights China Earthquake Network Center (CENC), Incorporated Research Institutions for Seismology (IRIS) and Institute of Geology and Geophysics, Chinese Academy of Sciences