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        :       Microwave  emission  effect  due  to rock  fracture  and its application  to natural  disaster  detection

:   Tadashi  Takano  ( Nihon University, Department of Electronics and Computer Science )

  :   201239日(周10:00-11:30

  点:  东南大学(四牌楼校区)李文正楼6614会议室

  办:  东南大学毫米波国家重点实验室

          IEEE AP-MTT-EMC Joint Nanjing Chapter




Keywords: microwave emission, rock fracture, wide frequency band signal, instantaneous phenomena,  receiving and recording system, earthquake, volcanic activity, Wenchuan earthquake, natural disaster monitoring

Microwave emission due to material destruction was discovered in Japan for the first time. In this presentation, I will describe the process and results of this new research field from the phenomena discovery to the subsequent expansion to natural disaster monitoring.

In the first part, the motive force of this research work is explained, and the obtained results of microwave emission in the case of a hypervelocity impact will be described. Then, I will expand the description to another style of material destruction, namely rock fracture by a static pressure. In this mode of destruction, microwave emission with similar characteristics was also observed, and its radiated power was successfully calibrated. The mechanism of the microwave emission has been almost clarified.

In the second part, I present the possibility to apply the phenomenon to natural disaster monitoring for earthquakes and volcanic eruptions, which are associated with rock fractures. According to the estimation result of the S/N ratio of the measuring system, the data taken by a remote sensing satellite was analyzed. The result shows the microwave emission from faults around the epicenters of earthquakes.


Dr. Takano was born in Tsukuba, Japan, in 1945. He received the B.S., M.S. and Ph.D. degrees in electric and electronics engineering from the University of Tokyo, in 1967, 1969 and 1972, respectively.

     In 1972, he joined the Electrical Communication Laboratories of Nippon Telegraph and Telephone Public Corporation (NTT). In 1984, he moved to the Institute of Space and Astronautical Science, Japan (ISAS), which was a part of the University of Tokyo and was again reorganized as a part of Japan Aerospace Exploration Agency (JAXA) in 2004. He was a professor in the Graduate School of the University of Tokyo from 1991 to 2007. In 2008, he retired JAXA, and was awarded Emeritus Professor. He moved to Nihon University in 2008, and is now a professor in Department of Electronics and Computer Science. His current research interests include antenna engineering, radio-wave and optical-wave applications and natural hazard detection technology.

     He received the Yonezawa Award 1975 and the Excellent Paper Award 1992, both from the Institute of Electronics, Information and Communication Engineers (IEICE) of Japan, the 1983 President Award and the 1983 Kajii Award both from NTT, the 1998 Prize of Japan Society for the Promotion of Machine Industry, and iWAT2010 Best Paper Prize.

     Dr. Takano is a member of IEEE (Fellow), URSI, IEICE (Fellow), Institute of Electrical Engineers of Japan, Japan Society for Aeronautical and Space Sciences, Japanese Rocket Society, American Geophysical Union, and Seismological Society of Japan.


Nihon University, Department of Electronics and Computer Science

7-24-1 Narashino-dai, Funabashi

274-8501 Japan



E-mail takano@ecs.cst.nihon-u.ac.jp

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