Invited by State Key Laboratory of Geodesy and Earth’s Dynamics (SKLGED), prof. Wang Rongjiang from Helmholtz-Centre Potsdam - German Research Centre for Geosciences(GFZ) visited APM and gave an academic report titled “Pre-P-wave elasto-gravitational (PPEG) signals and their potential use in modern seismology” on Oct 22.
Prof. Wang first analyzed the observation of gravity precursor wave caused by earthquake and its generating mechanism, and then introduced the synthetic seismogram calculation method including the earth's self-weight effect. Taking the Japanese earthquake as an example, he calculated the gravity acceleration change before the arrival of P wave caused by earthquake, and compared it with the observation data on the broadband seismic station to confirm effectiveness of the proposed method. The report also discussed the application prospect of the gravity precursor wave in the rapid determination of the magnitude of a major earthquake and the tsunami warning caused by a major earthquake. The participants had a heated discussion on the observation of the gravity precursor wave produced by the large earthquake and the coupling of elastic wave field and gravity disturbance.
Prof. Wang is a senior scientist of GFZ. He has made important contributions in the field of seismology, geodesy and related cross-study. His mainly interesting include earth tides correction, forward modeling and inversion of seismic waves.
Prof. Wang is giving his report.
Institute of Geodesy and Geophysics. Chinese Academy of Sciences
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