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Author-submitted data information


ID 414
Title Single- and two-station Lg amplitude data and a broadband Lg attenuation model in and around the Iranian Plateau
Creator Geng Yang
Subject Seismic Lg amplitude data
Publisher Xiukuan Zhao
Description The Single- and two-station Lg amplitude data was obtained in the Iranian Plateau and its surrounding regions from the Incorporated Research Institutions for Seismology Data Management Center, German Research Centre for Geoscience (GFZ), International Seismological Centre (ISC), International Federation of Digital Seismograph Networks (FDSN), and China-Iran Geological and Geophysical Survey in the Iranian Plateau (CIGS). 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 Iranian Plateau, we collected the vertical components waveforms of 859 crustal earthquakes occurring in and around the Iranian Plateau between October, 2014 and September, 2020 with magnitudes between 4.3 and 6.5, and performed an Lg attenuation tomography based on both the single- and two-station Lg amplitude data. To obtain the spectral Lg amplitudes, we used a 0.6 km/s-long group velocity window to scan the waveform between 3.7-2.9 km/s and to 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, as well as a constructed Lg attenuation model were provided in this dateset.
Contributor Ling Chen, Lian-Feng Zhao, Xiao-Bi Xie, Zhen-Xing Yao
Date October 2014 - September 2020
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, 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 Iranian Plateau 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/20220518LgAmplitudedata-IP.zip
DOI 10.12197/2022GA015
Source
Language eng
Relation
Coverage
Rights Incorporated Research Institutions for Seismology Data Management Center, German Research Centre for Geoscience (GFZ), International Seismological Centre (ISC), International Federation of Digital Seismograph Networks (FDSN), China-Iran Geological and Geophysical Survey in the Iranian Plateau (CIGS), and Institute of Geology and Geophysics, Chinese Academy of Sciences.