Author-submitted data information
| ID | 523 |
| Title | Single- and two-station Lg amplitude data and a broadband Lg attenuation model in and around the Alaska mainland |
| Creator | Geng Yang |
| Subject | Lg amplitude data, broadband Lg attenuation model, Alaska mainland |
| Publisher | Xiukuan Zhao |
| Description | The Single- and two-station Lg amplitude data was obtained in the Alaska mainland from the Incorporated Research Institutions for Seismology Data Management Center. The broadband Lg attenuation model was constructed based on both the single- and two-station Lg amplitude data. To explore the crustal Lg-wave attenuation in the Alaska mainland, we collected the vertical components waveforms of 242 crustal earthquakes occurring in and around the Alaska between January 2000 and July 2021 with magnitudes between 4.3 and 6.5, and performed a Lg attenuation tomography based on the single- and two-station Lg amplitude data. To obtain the spectral Lg amplitudes, we use a 0.6 km/s-long group velocity window to scan the waveform between 3.7-2.9 km/s and determine the Lg window with the maximum energy, calculated the Fourier spectra and corrected for noises using the pre-P recordings. The single-station Lg amplitudes were selected based on the pre-event signal-to-noise ratio thresholds of 2.0, respectively. 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. The resulting Lg attenuation model was also provided in this Data Repository. |
| Contributor | Lian-Feng Zhao, Xiao-Bi Xie, Xi He, Lei Zhang, Zhen-Xing Yao |
| Date | January 2000 - July 2021 |
| 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. 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 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, the 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 the Alaska mainland was stored in the QLgModel.txt files, with the columns successively being the longitude, latitude, frequency, and Q. |
| Format | ASCII format with suffixes as .dat |
| URL | http://www.geophys.ac.cn/ArticleData/20231027AlaskaLgdata.zip |
| DOI | 10.12197/2023GA024 |
| Source | |
| Language | eng |
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| Rights | Incorporated Research Institutions for Seismology Data Management Center |