Author-submitted data information
| ID | 627 |
| Title | Single- and two-station Pn amplitude data and a broadband Pn attenuation model in and around the Alaska mainland |
| Creator | Geng Yang |
| Subject | Pn wave, attenuation model, Alaska |
| Publisher | Xiukuan Zhao |
| Description | The Single- and two-station Pn amplitude data were obtained in the Alaska mainland from the Incorporated Research Institutions for Seismology Data Management Center. Based on both the single- and two-station Pn amplitude data, the broadband Pn attenuation model was constructed. To explore the crustal Pn-wave attenuation in the Alaska mainland, we collected the vertical components waveforms of 253 crustal earthquakes occurring in and around Alaska between January 2000 and August 2021 with magnitudes between 4.0 and 8.5. We performed a Pn attenuation tomography based on the single- and two-station Pn amplitude data. We sampled Pn waveforms in a 0.7 km/s group velocity window around the IASP91 first arrival time, calculated the Fourier spectra, and corrected for noises using the pre-P recordings. A signal-to-noise ratio (SNR) of 2.0 was used as a criterion for Pn data selection, and the amplitudes of the Pn signal were then obtained after removing the noise. The two-station Pn 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. The resulting Pn attenuation model was also provided in this Data Repository. |
| Contributor | Lian-Feng Zhao, Xiao-Bi Xie, Ying-Jie Yang, Zhen-Xing Yao |
| Date | January 2000 - August 2021 |
| Type | The Pn amplitudes were sampled at 42 frequencies distributed log-evenly between 0.5 and 20.0 Hz, and therefore, the spectral Pn amplitude data were provided in 42 separate files, each corresponding to one frequency indicated by the double-digit number in the file name. All Pn 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. 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 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, Pn amplitude, geometric spreading term, ‘0’ (meaningless) 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 5th 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, the inter-station ratio of Pn amplitude, geometric spreading term, ‘0’(meaningless) and sequence number of the in-between station. The Pn attenuation model for the Alaska mainland was stored in the QPnModel.txt files, with the longitude, latitude, frequency, and Q columns successively arranged. |
| Format | ASCII format with suffixes as .dat |
| URL | http://www.geophys.ac.cn/ArticleData/20241226PnQmodel.zip |
| DOI | 10.12197/2024GA028 |
| Source | |
| Language | eng |
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| Rights | Institute of Geology and Geophysics, Chinese Academy of Sciences and Incorporated Research Institutions for Seismology Data Management Center |