Author-submitted data information
| ID | 724 |
| Title | Single- and two-station Pn amplitude data and a broadband Pn attenuation model in the southeastern Tibetan Plateau |
| Creator | Tong Lu |
| Subject | Seismic Pn amplitude data and Pn attenuation model |
| Publisher | Xiukuan Zhao |
| Description | To explore the uppermost mantle Pn-wave attenuation and its implications in the southeastern Tibetan Plateau, we collected the vertical-component waveforms from 293 crustal earthquakes occurred in and around the southeastern Tibetan Plateau during 1996 and 2019 with magnitudes between 4.1 and 8.1, which were recorded at 1076 stations and obtained from the China Earthquake Networks Center (CENC), National Earthquake Data Center, and Incorporated Research Institutions for Seismology Data Management Center (IRIS). We performed a Pn attenuation tomography based on the single- and two-station Pn amplitude data. To obtain the spectral Pn amplitudes, 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 noise 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 pairs. The resulting single-station amplitudes and two-station amplitude ratios were provided in this Data Repository. |
| Contributor | Lian-Feng Zhao, Xiao-Bi Xie, Geng Yang, Zhen-Xing Yao |
| Date | 1996-2019 |
| Type | The Pn amplitudes were sampled at 66 frequencies distributed log-evenly between 0.1 and 40.0 Hz. Therefore, the spectral Pn amplitude data were provided in 66 separate files, with each file corresponding to one frequency indicated by the double-digit number in the file name. |
| Format | 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. Natural number and zero value occupy the 4th and 5th columns, respectively, which indicates that the current line is the header line for single-station data, where natural number is the sequence number of the recorded event, with the first two columns being the longitude and latitude of the recorded event, 3rd column being the number of lines of the following station data. The header lines for single-station data are immediately followed by data lines, with the columns successively representing the longitude and latitude of the recording station, Pn amplitude, geometric spreading term, a zero (indicating a non-event), and the sequence number of the recording station. In contrast, zero and natural number occupy the 4th and 5th columns, respectively, which indicates that the current line is the header line for two-station data, where natural number is the sequence number of the recording station, with the first two columns being the longitude and latitude of the station location, 3rd column being the number of lines of the following two-station data. The header lines for two-station data are immediately followed by data lines of two-station data, with the columns successively representing the longitude and latitude of the intermediate station, the inter-station ratio of Pn amplitude, the geometric spreading term, a zero (non-event), and the sequence number of the intermediate station. The Pn attenuation model for the southeastern Tibetan Plateau was stored in the QPnModel.txt files, with the columns being the longitude, latitude, frequency, and Q-value, respectively. |
| URL | http://www.geophys.ac.cn/ArticleData/20250808PnAmplitudeandAttenuationModeldata.zip |
| DOI | 10.12197/2025GA025 |
| Source | |
| Language | Eng |
| Relation | |
| Coverage | |
| Rights | China Earthquake Networks Center (CENC), National Earthquake Data Center, Incorporated Research Institutions for Seismology Data Management Center (IRIS). |