Author-submitted data information
| ID | 424 |
| Title | Single- and two-station Lg amplitude data obtained from the International Federation of Digital Seismograph Networks (FDSN) Mass Downloader service and a broadband Lg attenuation model around the Anatolian Plateau. |
| Creator | Wei-Mou Zhu |
| Subject | Seismic Lg amplitude, attenuation model, Anatolian Plateau |
| Publisher | Xiukuan Zhao |
| Description | The Single- and two-station Lg amplitude data of the Anatolian Plateau and its surrounding regions was obtained from International Federation of Digital Seismograph Networks (FDSN) Mass Downloader service. The broadband Lg attenuation model was constructed based on both the single- and two-station Lg amplitude data. To investigate the crustal Lg-wave attenuation and its implications mantle upwelling and plateau uplift, we collected 56341 vertical components waveforms recorded at 650 stations from 521 crustal earthquakes occurring in and around the Anatolian Plateau between January 2000 and December 2020 with magnitudes between 4.0 and 6.5. We performed a Lg attenuation tomography based on the single- and two-station Lg amplitude data. To obtain the spectral Lg amplitudes, we sampled Lg waveforms at a group velocity window of 3.6-3.0 km/s, we calculated Fourier spectra for both the Lg-wave and the noise, sampled the spectral amplitudes, and corrected for the noise effects. The equal-length time window including both pre-Pn and pre-Lg noise were used to extract the Lg-waveforms and the noise time series, respectively. Two signal-to-noise ratios (SNR) were used to quality control the data. The Lg waves with their SNR to pre-P noise less than 2 or SNR to pre-Lg noise less than 1.0 were removed to exclude Lg-signals seriously affected by the background noise or coda waves of previous phases. 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 | Lian-Feng Zhao, Xiao-Bi Xie, Xi He, Lei Zhang, Zhen-Xing Yao |
| Date | January 2000 - December 2020 |
| 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. The Lg attenuation model in Anatolian Plateau was stored in the AP_QLg_model.txt file, with the columns successively being the longitude, latitude, frequency, and Q. |
| URL | http://www.geophys.ac.cn/ArticleData/20220831Lg_Amplitude_data_AP.zip |
| DOI | 10.12197/2022GA025 |
| Source | |
| Language | eng |
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| Coverage | |
| Rights | International Federation of Digital Seismograph Networks (FDSN) and Institute of Geology and Geophysics, Chinese Academy of Sciences. |