Author-submitted data information
| ID | 607 |
| Title | Single- and two-station Lg amplitude data and a broadband Lg attenuation model in and around Colombia |
| Creator | Zhen Liu |
| Subject | Seismic Lg amplitude data |
| Publisher | Xiukuan Zhao |
| Description | Both the single- and two-station Lg amplitude data were obtained in the Colombia and its surrounding regions based on a large number of seismograms collected from the International Federation of Digital Seismograph Networks (FDSN), Incorporated Research Institutions for Seismology Data Management Center (IRIS), German Research Centre for Geoscience (GFZ), Institute de physique du globe de Paris Data Center (IPGP), The Seismological Center at the University of São Paulo (USP), Réseau sismologique et géodésique français Data Center (RESIF) and Observatories and Research Facilities for EUropean Seismology (ORFEUS). Thus, a broadband Lg attenuation model was accordingly constructed. To explore the crustal Lg-wave attenuation in and around Colombia, we collected the vertical components waveforms of 718 crustal earthquakes that occurred in and around Colombia between 2000 and 2023 with magnitudes between 4.5 and 6.6 and performed an Lg-wave Q tomography based on both the single- and two-station Lg spectral amplitudes. We used a group velocity window with a width of 0.6 km/s to scan the waveform within a broader window between 3.7-3.0 km/s and to determine the Lg window in terms of the maximum energy, calculated the Fourier spectra, and corrected for noises using the pre-P recordings and the pre-Lg recordings. The single-station Lg amplitudes were selected based on a threshold of 2.0 for the pre-P signal-to-noise ratio and 1.0 for the pre-Lg signal-to-noise ratio. The two-station Lg amplitude ratios were calculated for the roughly aligned triples of the event and station-pair. The resulting single-station amplitudes and two-station amplitude ratios, as well as a constructed Lg attenuation model in and around Colombia, were provided in this dataset. |
| Contributor | Lian-Feng Zhao, Xiao-Bi Xie, Carlos A. Vargas, Zhen-Xing Yao |
| Date | 2000-2023 |
| 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 separate files, with each file corresponding to one frequency indicated by the double-digit number in the name of the file. All Lg 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, Lg amplitude, geometric spreading term, the sequence number of the recording station, and the magnitude of the recorded event. 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 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, the inter-station ratio of Lg amplitude, geometric spreading term, the sequence number of the in-between station and the magnitude of the recorded event. The Lg attenuation model in and around Colombia was stored in the QLgModel.txt files, with the columns successively being the longitude, latitude, frequency, and Q-value. |
| Format | ASCII format with suffixes as .dat |
| URL | http://www.geophys.ac.cn/ArticleData/20240313LgAmplitudedata.zip |
| DOI | 10.12197/2024GA008 |
| Source | |
| Language | eng |
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| Rights | Institute of Geology and Geophysics, Chinese Academy of Sciences |