Author-submitted data information
| ID | 725 |
| Title | Single- and two-station Lg amplitude data and attenuation model for the southeastern Tibetan Plateau |
| Creator | Xi He |
| Subject | Seismic Lg amplitude data and broadband attenuation model |
| Publisher | Xiukuan Zhao |
| Description | To explore the crustal Lg-wave attenuation and its implications for regional crustal deformations in the southeastern Tibetan Plateau, we collected the vertical components waveforms of 134 crustal earthquakes occurring in the southeastern Tibetan Plateau during January 2007 and May 2016 with magnitudes between 4.4 and 6.4 and recorded at 1034 permanent and portable stations. We 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 noise 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 single-station amplitudes, two-station amplitude ratios, and the resulting broadband Lg attenuation model were provided in this Data Repository. |
| Contributor | Lian-Feng Zhao, Xiao-Bi Xie, Tong Lu, Zhen-Xing Yao |
| Date | January 2007 - May 2016 |
| Type | The Lg amplitudes were sampled at 58 frequencies distributed log-evenly between 0.05 and 10.0 Hz, and therefore the Lg amplitude data were provided in 58 separate files, with each file corresponding to one frequency indicated by the double-digit number in the name of the file. The Lg attenuation model was provided in one file. |
| Format | All Lg amplitude data, including single-station amplitudes and two-station amplitude ratios, were stored in the ASCII sott.*.dat files, along with the model file ‘LgQ.txt’, compressed in the SETPLgAmp.and.AttenuationModel.zip file. 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 the 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 being 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, and sequence number of the recording station. Zero value in the 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 being 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, and sequence number of the in-between station. The resulting Lg attenuation model is provided in the ASCII file, ‘LgQ.txt’, with the columns being the longitude, latitude, frequency, and Q-value. |
| URL | http://www.geophys.ac.cn/ArticleData/20250808SETPLgAmpAndAttenuationModel.zip |
| DOI | 10.12197/2025GA026 |
| Source | |
| Language | Eng |
| Relation | |
| Coverage | |
| Rights | Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China, China National Earthquake Data Center, International Earthquake Science Data Center, and Incorporated Research Institutions for Seismology Data Management Center (IRIS-DMC) |