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Short title
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Microcracks preceding ruptures in crust
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Oral presentation
Date/Room/Chair
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May 2 AM1 (09:00 - 10:45)
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313
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Yukio Fujinawa
/ Qinghua Huang
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May 2 AM2 (11:00 - 11:45)
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313
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Yasuhide Hobara
/ Andre Revil
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Poster presentation
Date/Room
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May 2 (Core Time 16:15 - 17:30)
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Poster
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Contact
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Yukio Fujinawa
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Email
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hjfujinawa@cl.cilas.net
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Convener
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Yukio Fujinawa
/ Yasuhide Hobara
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Scope
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The microcrack has been widely investigated in various disciplines including seismology and geotechnical engineering communities. The disastrous natural events as earthquake, volcanic eruption or ground slide are considered as rupture of crust consisting of heterogeneous rocks. These rupture precede small cracks in the preparatory stage of main ruptures. The rupture of smallest scale accompanies the so-called acoustic emission (AE) providing means to investigate rupture process and to monitor the health check of the rocks.
Recent years the investigation has extended to the seismo-electromagnetic phenomena especially to find precursors for short-term prediction. Moreover characteristics of the electromagnetic phenomena are suggested to open new windows to look into the state of the medium and rupture phenomena. The crust of the earth is elastic-porous medium filled with fluids as water. The research on the rupture had a remarkable progress in early 1990 contributing to interpret the mysterious seismoelectric phenomena associated earthquakes. Examples are 1) the faster propagation of co-seismic signal with velocity much larger than the p-wave, 2)the ULF band anomalies associated the slow-slip of subducting slab and 3)the converted electromagnetic mode at the material contrast for surveying oil and gas. And, 4) the electromagnetic method has been shown to detect micro-cracks preceding natural earthquakes suggesting that the nucleation stage can be identified. In this session we intend to summarize state of arts of investigation on microcrack in variety of disciplines to make further progress on the basis of new finding of phenomena and new techniques proposed. We hope to contribute to build more practical prediction method of earthquake, volcanic eruption, and ground-slide.
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Notes
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| Time |
Presentation No |
Title |
Author |
Presenter |
Abstract |
|
Oral Presentation May 2 AM1 (09:00-10:45) 313 to the top
|
|
09:00 - 09:24
|
Invited
SCG10-01
|
Microcracks preceding ruptures: insights gained from laboratory acoustic emission study
|
LEI, Xinglin
|
LEI, Xinglin
|
English
|
|
09:24 - 09:39
|
SCG10-02
|
Radio wave emission in friction or collision of various materials
|
TAKANO, Tadashi
HANAWA, Rikuya
SAEGUSA, Saegusa
|
TAKANO, Tadashi
|
English
|
|
09:39 - 10:03
|
Invited
SCG10-03
|
Seismoelectric phenomena of electrokientic nature associated with the formation of cracks in porous media
|
REVIL, Andre
|
REVIL, Andre
|
English
|
|
10:03 - 10:18
|
SCG10-04
|
Waveform analysis of seismo-magnetic signals in Boso, Japan
|
HAN, Peng
HATTORI, Katsumi
FEBTY, Febriani
other
|
HAN, Peng
|
English
|
|
10:18 - 10:42
|
Invited
SCG10-05
|
Quantitative evidence of the coupling between seismic and electromagnetic signals
|
HUANG, Qinghua
|
HUANG, Qinghua
|
English
|
|
10:42 - 10:45
|
3-min talk in an oral session (SCG10-P01)
|
|
Oral Presentation May 2 AM2 (11:00-11:45) 313 to the top
|
|
11:00 - 11:15
|
SCG10-06
|
The Development of self-potential tomography to estimate the ground water condition
|
OTSUBO, Hiroshi
HATTORI, Katsumi
YMAZAKI, Tomohiro
|
YMAZAKI, Tomohiro
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English
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11:15 - 11:30
|
SCG10-07
|
Induced seismicity due to fluid injection at a deep well in Youngstown, Ohio, USA
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KIM, Won-young
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KIM, Won-young
|
English
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|
11:30 - 11:45
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SCG10-08
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Characteristics of Microcracks in the Nucleation Stage of Natural Earthquake
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FUJINAWA, Yukio
NODA, Yoichi
TAKAHASHI, Kozo
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FUJINAWA, Yukio
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English
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| Presentation No |
Title |
Author |
Presenter |
Abstract |
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Poster Presentation May 2 Core Time (16:15-17:30) Poster to the top
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SCG10-P01
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Electromagnetic emissions from fracture of semiconductor pyrite
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OZAWA, Mitsuyuki
MUTO, Jun
NAGAHAMA, Hiroyuki
other
|
OZAWA, Mitsuyuki
|
English
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