Invited by State Key Laboratory of Geodesy and Earth’s Dynamics (SKLGED), professor Peng Zhigang from Georgia Institute of Technology visited Institute of Geodesy and Geophysics(IGG) and gave an academic report on title "Human-Induced Seismicity: A Historic Review and Recent Progresses" on July 12.

The report first introduced the seismic situation caused by water pressure fracturing, waste water treatment and oil flooding during the process of resource extraction. He analyzed the different cause of seismic from those in west of Canada and the eastern parts of the United States. The result showed that the seismic of the eastern parts of the United States are mainly due to waste water treatment, while the western region of Canada earthquake are mainly caused by hydraulic fracturing. Professor Peng showed the impact of the maximum magnitude of the fluid injection earthquake. The maximum magnitude of the earthquake directly induced by the water injection activity has a certain internal relationship with the water injection volume, and the magnitude of the earthquake caused by the re-activity of the nearby fault triggered by the water injection activity may be even greater. He also introduced the slow slip phenomenon and the low frequency earthquake events, discussing the characteristics of the two special earthquakes and the conventional seismic source duration distribution, and then analyzed some slow slip phenomena induced by water injection activities. The audiences have a deep discussion with professor Peng about the application of the joint observation of seismic (GPS, Strong Motion Seismograph and others instruments) at the end of the report.

Professor Peng is mainly engaged in high-definition fault structure inversion, temporal variation of earth media, seismic source characteristics, earthquake triggering, slow earthquake, artificial induced earthquake and microseismic monitoring.

                                                                   Professor Peng was giving his report.