JpGU-AGU Joint Meeting 2017

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[EJ] Oral

S (Solid Earth Sciences) » S-IT Science of the Earth's Interior & Tectonophysics

[S-IT32] [EJ] Recent earthquakes and deep structure of the Earth in and around Tibetan Plateau

Wed. May 24, 2017 10:45 AM - 12:15 PM 103 (International Conference Hall 1F)

convener:Ling Bai(ITP Institute of Tibetan Plateau Research, Chinese Academy of Sciences), James Mori(Earthquake Hazards Division, Disaster Prevention Research Institute, Kyoto University), Hiroshi Sato(Earthquake Prediction Research Center, Earthquake Research Institute, The University of Tokyo), Yuzo Ishikawa(The National Institute of Advanced Industrial Science and Technology), Chairperson:Ling Bai(ITP Institute of Tibetan Plateau Research, Chinese Academy of Sciences), Chairperson:James Mori(Earthquake Hazards Division, Disaster Prevention Research Institute, Kyoto University), Chairperson:Hiroshi Sato(Earthquake Research Institute, Tokyo University), Chairperson:Yuzo Ishikawa(The National Institute of Advanced Industrial Science and Technology)

11:30 AM - 11:45 AM

[SIT32-04] The very low frequency earthquakes (VLFEs) relation with the 2008’s great Wenchuan earthquake

*jin deng

Keywords:very low-frequency earthquakes(VLF), Low-frequency events, the 2008’Wenchuan 8.0 earthquake

This study reports discovery of very low frequency earthquakes (VLFEs) that occurred 4 h before the 2008 Ml=8.0 Wenchuan earthquake. The VLF events swarm is of 35 events, recorded by China seismic monitoring network between 10:00 to 12:00 on 12 May 2008. The VLFEs are characterized by waveform durations of 1000-2000 s, magnitudes of Mw2-4 and focal depths 25-40 km deeper than those of natural earthquakes in the same regions. The VLFs last arrived phase is reflected wave and clearly to be identified in VLFs waveform, as fig.1. The VLF waveforms is from more than one events with its Pg arrival times.
The VLFEs swarm can be one of important precursor evidence before the large earthquake.