Author-submitted data information
| ID | 830 |
| Title | Seismic waveforms of Pg waves and noise recorded across the eastern Anatolian-Iranian Plateau, plus single- and two-station Pg amplitude data and Pg-wave Q model |
| Creator | Geng Yang |
| Subject | Seismic Pg and noise waveforms in ./Pgwaveforms, plus single- and two-station Pg amplitude data and Pg-wave Q model in ./PgQmodel. |
| Publisher | Xiukuan Zhao |
| Description | (1) For seismic Pg and noise waveforms in ./Pgwaveforms: To explore the crustal Pg-wave attenuation and its tectonic implications for the eastern Anatolian-Iranian Plateau, we compiled a new dataset of vertical–component waveforms from regional earthquakes in and around the eastern Anatolian-Iranian Plateau. We used 308 crustal earthquakes recorded by 274 broadband seismic stations for attenuation tomography. The selected events occurred between July 2009 and September 2020, with magnitudes ranging from 4.0 to 7.3. The stations are distributed across the Iranian and Anatolian Plateaus and were obtained from four main sources. We obtained 55 stations from global public seismic networks through GFZ Data Services, 25 from the International Institute of Earthquake Engineering and Seismology (IIEES) in Iran, and 54 from the Iranian Seismological Center (IRSC). In addition, we deployed 140 temporary stations across Iran between 2013 and 2018 as part of the China–Iran Geological and Geophysical Survey in the Iranian Plateau (CIGSIP) project. We extracted the Pg signal using a group-velocity window of 5.4–6.3 km/s. 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. We also uploaded the Pg and noise waveforms recorded by the CIGSIP, IRSC, and IIEES stations to this Data Repository, organized into folders by seismic network. The instrument response files are provided in the corresponding Response folders. 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 ./PgQmodel: To investigate crustal Pg-wave attenuation in the eastern Anatolian–Iranian Plateau, we compiled a dataset of vertical-component waveforms from regional earthquakes in and around the eastern Anatolian–Iranian Plateau and performed Pg attenuation tomography based on single- and two-station Pg amplitude data. We sampled Pg waveforms within a group-velocity window of 5.4–6.3 km/s. We calculated Fourier spectra and estimated noise from the pre-P recordings. We used a signal-to-noise ratio (SNR) of 2.0 as the criterion for selecting reliable Pg data and then obtained Pg amplitudes after noise correction. Two-station Pg amplitude ratios were calculated for approximately aligned event–station–station configurations. The resulting single-station Pg amplitudes, two-station Pg amplitudes and QPg model are provided in this Data Repository. |
| Contributor | Ramin Movaghari, Ling Chen, Lian–Feng Zhao, Yingjie Yang, Xiao–Bi Xie, and Zhen–Xing Yao |
| Date | July 2009 - September 2020 |
| Type | (1) For Seismic Pg and noise waveforms in ./Pgwaveforms: All Pg and noise waveforms are stored in standard SAC format in the folders named cut_Pg and cut_noise, respectively. Example waveforms from the earthquake that occurred on 2 May 2018 are provided in CIGSIP/example_event_waveforms. For the CIGSIP stations, the instrument response file contains the following information. The first line contains the response name; the second line gives the segment number corresponding to time interval (1); and the third and fourth lines specify the start and end dates, respectively. The fifth line contains A0, sensitivity (m/s), the constant (0.02), the number of poles and zeros, the input unit (1=m, 2=m/s), and the input style (D = displacement, V = velocity), respectively. The subsequent lines list the real and imaginary parts of each pole and zero in sequence. For the IRSC and IIEES stations, the instrument response files are provided in the standard RESP format supported by SAC. (2) For single- and two-station Pg amplitude data and Pg-wave Q model in ./PgQmodel: We sampled Pg amplitudes at 51 logarithmically evenly spaced frequencies between 0.1 and 10.0 Hz. The Pg spectral amplitude and amplitude-ratio data are provided in 51 separate files, each corresponding to one frequency. The corresponding frequency is 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 Num_frequency.txt. The file QPgmodel.txt provides the crustal QPg models at different frequencies. |
| Format | SAC format in the file named *.SAC All Pg amplitude data, including single-station Pg amplitudes and two-station Pg amplitude ratios, are stored in ASCII files named Sott.*.b.dat. The file Num_frequency.txt provides the correspondence between the two-digit number and frequency. The sott.*.b.dat files consist of header lines and data lines. For single-station data, a zero value in the fifth column indicates that the current line is a header line. The first two columns contain the longitude and latitude of the recorded event, respectively; the third column gives the number of data lines that follow; and the fourth column gives the event's sequence number. Each single-station header line is immediately followed by the corresponding single-station data lines. The columns in these data lines contain, in order, the recording station's longitude and latitude, Pg amplitude, geometric spreading term, and sequence number. For two-station data, a zero value in the fourth column indicates that the current line is a header line. The first two columns contain the recording station's longitude and latitude, respectively; the third column gives the number of data lines that follow; and the fifth column gives the recording station's sequence number. Each two-station header line is immediately followed by the corresponding two-station data lines. The columns in these data lines contain, in order, the longitude and latitude of the intermediate station, the inter-station Pg amplitude ratio, the geometric spreading term, a value of ‘0’ (not used), and the intermediate station's sequence number. The file QPgmodel.txt provides the crustal QPg models at different frequencies. The four columns contain, in order, longitude, latitude, frequency, and QPg value. |
| URL | http://www.geophys.ac.cn/ArticleData/20260917Anatolia_Iran_Pg_Data.rar |
| DOI | 10.12197/2026GA031 |
| Source | |
| Language | Eng |
| Relation | |
| Coverage | |
| Rights | College of Geoexploration Science and Technology, Jilin University The Institute of Geology and Geophysics, Chinese Academy of Sciences The German Research Centre for Geoscience (GFZ) The International Institute of Earthquake Engineering and Seismology (IIEES) The Iranian Seismological Center (IRSC) The China-Iran Geological and Geophysical Survey in the Iranian Plateau (CIGSIP) project |