Crustal magnetic anomaly characteristics of Chinese mainland based on MF6, EMM2010 and CGRF2010 models

The 2010.0 Epoch China Geomagnetic Map and its related models based on ground observation could describe the lithospheric magnetic field of Chinese mainland (refer to as Chinese geomagnetic reference field on 2010 epoch, CGRF2010 for short). We can also use global geomagnetic models, MF6 and EMM2010 for example, to calculate the lithospheric magnetic field of Chinese mainland. Based on the three models, the lithospheric magnetic fields of Chinese mainland were calculated in this paper. Each of them has its own characteristics. MF6 model, which was based on satellite data, has limited resolution and wormlike magnetic anomaly stripes. The model EMM2010 has a very similar overview general picture with the model MF6 but has a lot more details. The model CGRF2010, which has many clustery anomalous areas, is highly reliable, although the resolution of the model is quite different from east to west. The analyses on the vertical component ΔZ of lithospheric magnetic field and its distribution characteristics indicate that the three model-based ΔZ are consistently positive at Junggar, Tarim, Qaidam and Sichuan basin and negative at Tianshan and Dabashan. The ΔZ component distribution of the three models at North China lithospheric block agrees well with that at South China lithospheric block. However, ΔZ component based on global geomagnetic models is notably different from that based on the model CGRF2010 at southern Qinghai-Xizang (Tibet) Plateau, northern Xiyu lithospheric block and whole Songliao lithospheric block.