Author-submitted data information
| ID | 832 |
| Title | High-resolution Pg attenuation structure and its insights into crustal thickening and plateau extension in the NE Tibetan Plateau |
| Creator | Lixin Zhong |
| Subject | Seismic waveforms of Pg and noise, single- and two-station Pg amplitude data, and a broadband Pg attenuation model in the northeastern Tibetan Plateau. |
| Publisher | Xiukuan Zhao |
| Description | Seismic Pg and noise waveforms in ./Cutwaveform_Pg, plus single- and two-station Pg amplitude data and Pg-wave Q model in ./PgAmplitudedata. (1) For seismic Pg and noise waveforms in ./Cutwaveform_Pg: To explore the crustal Pg-wave attenuation and its implications in the northeastern margin of the Tibetan Plateau, we collected 11,382 broadband vertical-component seismograms from 84 seismic events around the northeastern Tibetan Plateau during 2007 and 2016 with magnitudes between 4.5 and 8.1, which were recorded at 953 stations and obtained from the China Earthquake Networks Center (CENC). We extracted the Pg signal using a group-velocity window of 6.3-5.4 〖km s〗^(-1). We sampled noise using a time window of equal length preceding the first P-wave arrival. We included an additional 10% of the window duration before and after each time window to apply cosine tapers to the extended portions. Please note that all waveforms uploaded to this Data Repository are the original raw data. They have not undergone any preprocessing, quality control, or data screening/selection. (2) For single- and two-station Pg amplitude data and Pg-wave Q model in ./PgAmplitudedata: We performed Pg attenuation tomography using the single- and two-station Pg amplitude data. We extracted the Pg wave along with its pre-phase noise and pre-event noise by employing a sliding velocity window of 6.3-5.4 km s-1. Then we applied the Fast Fourier Transform (FFT) to the extracted signals to obtain the amplitude spectra of the Pg wave, pre-phase noise, and pre-event noise. Amplitude sampling was performed at 66 equidistant frequency reference points within the 0.05-20 Hz band, spaced logarithmically at 0.04 intervals. After denoising, we selected Pg-wave amplitudes with an SNR greater than 2 relative to pre-event noise and greater than 1 relative to pre-phase noise as the dataset for Pg-wave Q imaging. We constructed a linear inversion system comprising all single-station data and a linear system composed of dual-station data, based on the principle that great-circle paths are equivalent, to obtain single-station amplitudes and two-station amplitude ratios. This Data Repository provides the resulting single- and two-station amplitudes, and the resulting broadband Pg-wave Q model in this region. |
| Contributor | Lian-Feng Zhao, Xiao-Bi Xie, Tuna Eken, Ruo-Jie Li, Xi He, and Zhen-Xing Yao |
| Date | 2007-2016 |
| Type | (1) For Seismic Pg and noise waveforms in ./Cutwaveform_Pg: There are 84 waveform files named according to the time of one of 84 seismic events. In each waveform file, all Pg and noise waveforms are stored in the standard SAC format in files named in the format: Pg.Network.Station.00.SAC. (2) For single- and two-station Pg amplitude data and Pg-wave Q model in ./PgAmplitudedata: The Pg amplitude we provide was sampled at 51 frequencies distributed log-evenly between 0.1 and 10.0 Hz. Therefore, we provided the spectral Pg amplitude data in 51 separate files, with each file corresponding to one frequency indicated by the two-digit number in the file name. The frequency corresponding to each two-digit number in the file name is listed in Frequency.txt. The file QPgModel.txt provides the crustal QPg models at different frequencies. All Pg amplitude data, including single-station amplitudes and two-station amplitude ratios, were stored in the ASCII Sott.*.b.dat files. The correspondence between the frequency and the double-digit number can be looked up in the file ‘Frequency.txt’. The sott.*.b.dat files consist of header lines and data lines. For single-station data, a zero value in the 5th column indicates that the current line is a header line. The natural number in the 4th column is the sequence number of the recorded event; the first two columns contain the longitude and latitude of the recorded event, respectively; the 3rd column gives the number of lines of the following station data. The header lines are immediately followed by data lines, with the columns representing the recording station's longitude and latitude, Pg amplitude, geometric spreading term, and the recording station's sequence number. For two-station data, a zero value in the 4th column indicates that the current line is a header line. The natural number is the recording station sequence number; the first two columns contain the station longitude and latitude, respectively; the 3rd column gives the number of lines in the following two-station data. The header lines are immediately followed by data lines, with the columns successively representing the longitude and latitude of the intermediate station, the inter-station ratio of Pg amplitude, the geometric spreading term, and the sequence number of the intermediate station. The Pg attenuation model for the northeastern Tibetan Plateau was stored in the QPgModel.txt files, with columns for longitude, latitude, frequency, and Q-value. |
| Format | SAC format in the file named *.SAC. All Pg amplitude data, including single-station amplitudes and two-station amplitude ratios, were stored in the ASCII Sott.*.b.dat files. |
| URL | http://www.geophys.ac.cn/ArticleData/20261004Waveforms_Pg_noisesandPgamplitude_models.rar |
| DOI | 10.12197/2026GA033 |
| Source | |
| Language | Eng |
| Relation | |
| Coverage | |
| Rights | China Earthquake Networks Center, National Earthquake Data Center The Institute of Geology and Geophysics, Chinese Academy of Sciences |