Author-submitted data information
| ID | 508 |
| Title | Back-azimuth measurements of InSight Low Frequency events and the software code used |
| Creator | Xu Wang |
| Subject | Single-station-based event back-azimuth determination |
| Publisher | Xiukuan Zhao |
| Description | From February 2019 to December 2022, the NASA’s InSight seismometer recorded nearly one hundred Low Frequency events on Mars. Precisely locating these events is crucial for understanding the tectonic activity and subsurface structure of Mars. However, challenges arise due to the limitation of having only a single station on Mars and the fact that some of the event data are noisy. To improve the accuracy of marsquake locations, we developed a varying-parameter scheme for polarization analysis to determine event back-azimuths. With this method, we obtained back-azimuth measurements of 46 Low Frequency events, including 2 meteorite impact events and 44 marsquakes. The back-azimuth measurements are stored in the “BAZ” folder, and the code used is stored in the “VPPA” folder. The back-azimuth measurements for events can be found in the path (./BAZ/signal/EventLabel/*), and those for noise can be found in the path (./BAZ/noise*/EventLabel/*). |
| Contributor | Ling Chen, Xin Wang |
| Date | Feb. 2019 - Dec. 2022 |
| Type | The back-azimuth data files include EventLabel*_baz.dat and EventLabel*_selbaz.dat. The EventLabel*_baz.dat file contains all measurement results, while the EventLabel*_selbaz.dat file only includes measurements with comprehensive factor values exceeding the event-specific average. In these files, each column represents different parameters. The columns include the back-azimuth estimate, linearity degree of polarization, cross-correlation coefficient, signal-to-noise ratio, comprehensive factor, low and high cutoff frequencies of the filter, and starting and ending points of the time window. The summary_baz.dat file includes columns for the Event Label, the optimal (mean), standard deviation, and magnitude values for the primary peak, the optimal, standard deviation, and magnitude values for the secondary peak (if available, otherwise NaN). Additional columns may exist for unused parameters. |
| Format | ASCII file |
| URL | http://www.geophys.ac.cn/ArticleData/20230619InSightBAZ.zip |
| DOI | 10.12197/2023GA009 |
| Source | |
| Language | eng |
| Relation | |
| Coverage | |
| Rights | Institute of Geology and Geophysics, Chinese Academy of Sciences |