Author-submitted data information
| ID | 602 |
| Title | The stack profiles and the Kirchhoff prestack time migration profiles in both segy and jpg formats for the Jungger basin-Altai mountains deep seismic reflection profile |
| Creator | Lei Zhang |
| Subject | Intraplate thrust orogeny, Altai mountains, Deep seismic survey |
| Publisher | Xiukuan Zhao |
| Description | To investigate the crustal structure of the Altai mountains, we acquired a 166.8 km-long deep seismic reflection profile that samples the Junggar basin, East Junggar, and the Chinese Altai mountains and crosses the Erqis fault in the southwestern margin of the Altai mountains. Seismic data were acquired as conventional two-dimensional vertical-component explosive-source land profiles. In total, we detonated 715 explosions including 701 small and medium shots, 11 large shots, and 3 huge shots from September 6th to October 10th in 2018. The seismic reflection profile was processed using the CGG Geocluster (now Geovation) and Psg-mig seismic processing packages. Bad traces were removed and refracted, and surface waves arrived before the reflected wave train was muted. Surface-consistent topographic corrections (‘statics’) were calculated tomographically and applied using a replacement velocity of 2 km/s to correct all data to a final datum elevation of 4 km above sea level. Noise suppression was an important part of the data processing and included linear noise reduction, adaptive attenuation for suppressing surface waves, 50 Hz denoising, and multidomain (t-x, f-k) noise attenuation to filter random noise. Amplitudes were compensated for spherical spreading by a surface-consistent approach. Deconvolution was also surface-consistent, using a 36 ms prediction length, 240 ms operator length, and 0.5% white noise coefficient. Velocity analysis utilized velocity spectral-density plots at an increment of 50 common midpoints (CMPs) (spacing of 1000 m). Surface-consistent correlation (residual) autostatics were calculated and applied at 20 m to 16 km offsets. Kirchhoff prestack time migration used a migration aperture of 8 km, an anti-aliasing distance of 20 m, and an anti-aliasing frequency of 35 Hz. The stack profile and Kirchhoff prestack time migration profile were provided in this Data Repository. |
| Contributor | Lian-Feng Zhao, Liang Zhao, Xiao-Bi Xie, Xiaobo Tian, Wenjiao Xiao, and Zhen-Xing Yao |
| Date | September 6th, 2018 - October 10th 2018 |
| Type | The stack profile was stored as "stack_art2d.sgy" in SEGY format and as "stack_art2d.jpg" in jpg format, respectively. The Kirchhoff prestack time migration profile was stored as “pstm_art2d.sgy” in SEGY format and as “pstm_art2d.jpg” in jpg format, respectively. |
| Format | The files are in SEGY format with suffixes as .sgy and in JPG format with suffixes as .jpg |
| URL | http://www.geophys.ac.cn/ArticleData/20240118SeismicData.zip |
| DOI | 10.12197/2024GA003 |
| Source | |
| Language | eng |
| Relation | |
| Coverage | |
| Rights | Institute of Geology and Geophysics, Chinese Academy of Sciences |