Seismic Imaging and Seismicity Analysis in Beijing-Tianjin-Tangshan Region

Figure 15

Vertical cross-section of P wave tomographic image along profile TT′ in Tangshan area. White stars and circles denote the earthquakes of 𝑀_𝐿 ≥ 4.0 and 𝑀_𝐿 < 4.0, respectively, the occurred within 0.25° off the profile. Red and blue colors denote slow and fast velocity anomalies, respectively. No vertical exaggeration. The location of profile TT′ is shown in Figure 11.