| ID |
738 |
| Title |
Seismic waveforms of seismic Pn-waves and noise, single- and two-station Pn amplitude data, and the broadband Pn attenuation model in southeast China |
| Creator |
Lin Shen |
| Subject |
Seismic Pn and noise waveforms, Pn amplitude data, Pn attenuation model |
| Publisher |
Xiukuan Zhao |
| Description |
To explore the uppermost mantle Pn-wave attenuation and its tectonic implications for southeast China, we collected the vertical components waveforms of 458 crustal earthquakes that occurred in the southeast China and its surrounding regions over a time period between January 2009 and May 2022, which were recorded at 312 stations including 43 stations from Incorporated Research Institutions for Seismology Data Management Center and 269 station from China Earthquake Network Center. Pn-wave waveform was sampled in a 0.7 km/s-long group velocity window around the first arrival time, and the noise was extracted before the P arrival within a window with equal time length to the Pn waveform. A Python framework for processing seismological data (ObsPy) was used to remove the trends, means, and instrument responses with a bandwidth filter between 0.1 and 40.0 Hz for the raw vertical-component seismograms. Here, we extracted all vertical components of the Pn and noise waveforms used in our study and uploaded them to this Data Repository in the folder named “Cut_Waveform_Pn”. A signal-to-noise ratio threshold of 2.0 was used as the criterion for Pn data selection, and the amplitude of the Pn signal was then obtained after denoising. The two-station Pn amplitude ratios were calculated for the roughly aligned triples of event and station-pair. Pn spectral data, including the single-station amplitudes and two-station amplitude ratios, were provided in the folders named “Pn_Amplitude_Model”. The resulting QPn model was stored in the “Dataset_PnQmodel.txt” file, which consists of a header line for column descriptions. The first column represents frequency, the second and third columns represent the longitude and latitude of the spatial discrete points, and the fourth column represents the QPn value. |
| Contributor |
Lian-Feng Zhao |
| Date |
Jan 2009-May 2022 |
| Type |
All Pn and noise waveforms are stored within earthquake-specific folds, with files following the standard SAC format in the directories named “Pn.*.SAC”. The amplitude units for all SAC files are in meters. The Pn amplitudes were sampled at 40 frequencies distributed log-evenly between 0.5 and 20.0 Hz. Therefore, the spectral Pn amplitude data were provided in 40 separate files, with each file corresponding to one frequency, as indicated by the double-digit number in the file name; the resulting QPn model includes QPn distributions at 40 discrete frequencies, correspondingly. |
| 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 numbers and zero values occupy the 4th and 5th columns, respectively, which indicates that the current line is the header line for single-station data, where the 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. Note that the longitudes and latitudes represent the propagation path of the Pn wave within the upper mantle. The header lines for single-station data are immediately followed by data lines, with the columns successively being the longitude and latitude of the recording station, Pn amplitude, geometric spreading term, a zero, 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 being the longitude and latitude of the in-between station, the inter-station ratio of Pn amplitude, the geometric spreading term, a zero, and the sequence number of the in-between station. |
| URL |
http://www.geophys.ac.cn/ArticleData/20251014PnWaveDataAttenuationModel.zip |
| DOI |
10.12197/2025GA039 |
| Source |
|
| Language |
Eng |
| Relation |
|
| Coverage |
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| Rights |
China Earthquake Networks Center (CENC), National Earthquake Data Center, Incorporated Research Institutions for Seismology Data Management Center (IRIS), and the Institute of Geology and Geophysics, Chinese Academy of Sciences. |
