Fig. 5
From: Research on seismic activity and seismic structural characteristics of the Shandong region
Focal Depth Profile of Modern Regional Earthquakes (January 1970 to September 2023, 2.0 ≤M≤ 4.6). (a) Hypocentral Depth-Azimuth Map. (b) Hypocentral Depth-Quantity Chart. Each square in the figure (a) represents an earthquake, with the color indicating the depth, transitioning from blue to yellow as the seismic source depth gradually increases. The figure (b) records the number of earthquakes at different depths, with the color change reflecting the increasing depth of the seismic source. The maps were generated using maPInfo software (version 16; http://www.precisely.com) and modified using Power Point (version 2019; https://www.microsoft.com).
