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Short title
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Microcracks and crustal structure
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Oral presentation
Date/Room/Chair
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May 24 PM1 (15:15 - 16:00)
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203
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Niels Grobbe
/ Yukio Fujinawa
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May 24 PM2 (16:15 - 18:00)
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203
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Yasuhide Hobara
/ Qinghua Huang
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Poster presentation
Date/Room
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May 24 (Core Time 18:15 - 19:30)
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Convention Hall
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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
/ Qinghua Huang
/ Niels Grobbe
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Scope
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The microcrack has been widely investigated in various disciplines including seismology and geotechnical engineering communities. Disastrous natural events such as earthquakes, volcanic eruptions or landslides are considered as ruptures of the Earth's crust consisting of heterogeneous rocks. These ruptures have been known to be preceded by small microcracks in the preparatory stage. They are accompanied by so-called acoustic emission (AE) and seismo- electromagnetic phenomena providing means to investigate the rupture process of earthquake and ground slides, rock bursts in mines, and health check of tunnels.
Moreover, seismoelectronics has been developed as new windows to determine physical parameters of the crust and its fluids in the geophysical exploration using active sources. The method has been used for detecting the electrical, hydraulic, and/or mechanical properties by measuring the mechanical energy conversion characteristics into electromagnetic energy at crustal macroscopic interfaces.
The research on the seismo-electromagnetic fields had a remarkable progress in the early 1990's. Examples are 1) the seismoelectric conversion generating an independently diffusing electromagnetic field at material contrasts for surveying for oil and gas, 2) the coupling between seismic and electromagnetic phenomena, 3) the ULF band anomalies associated the slow-slip of subducting slab, 4) the combination of both seismic resolution and electromagnetic (fluid) sensitivity, and 5) the possible detection of micro-cracks preceding natural earthquakes.
We intend to present state-of-the-art investigations on microcracks in a variety of disciplines, amongst which are new findings using seismoelectric phenomena and other new techniques for understanding of the microcracks preceding crustal ruptures. We hope to contribute in building a more practical short-term prediction method and in developing geophysical prospecting.
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Notes
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| Time |
Presentation No |
Title |
Author |
Presenter |
Abstract |
|
Oral Presentation May 24 PM1 (15:15-16:00) 203 to the top
|
|
15:15 - 15:35
|
Invited
SCG15-01
|
Electromagnetic fields in the solid material neighbouring porous media
|
REN, Hengxin
HUANG, Qinghua
CHEN, Xiaofei
|
REN, Hengxin
|
|
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15:35 - 15:50
|
SCG15-02
|
Exclusion of metal contact noise in the experiment of radio wave emission due to rock fracture
|
TAKANO, Tadashi
HANAWWA, Rikuya
KAWATA, Yuki
other
|
TAKANO, Tadashi
|
|
|
Oral Presentation May 24 PM2 (16:15-18:00) 203 to the top
|
|
16:15 - 16:35
|
Invited
SCG15-03
|
Medium effect on the characteristics of electromagnetic signals accompanying with seismic waves
|
HUANG, Qinghua
REN, Hengxin
|
HUANG, Qinghua
|
|
|
16:35 - 16:50
|
SCG15-04
|
Properties of seismo-electric variations induced by microcracks in the nucleation stage of earthquake occurrence
|
FUJINAWA, Yukio
NODA, Yoichi
|
FUJINAWA, Yukio
|
|
|
16:50 - 17:05
|
SCG15-05
|
The Mechanism of the Pre-seismic Changes of the Tidal Deviation of Groundwater Level in Hualien City, Taiwan
|
LAI, Wenchi
WANG, Shihjung
HSU, Kuochon
other
|
LAI, Wenchi
|
|
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17:05 - 17:25
|
Invited
SCG15-06
|
Seismoelectric Interferometry
|
GROBBE, Niels
SLOB, Evert
|
GROBBE, Niels
|
|
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17:25 - 17:40
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SCG15-07
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Feasibility study of characterizing crustal cracks by EMR in the VLF band using interferometry
|
LIU, Lanbo
HUANG, Qinghua
|
LIU, Lanbo
|
|
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17:40 - 17:55
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3-min talk in an oral session (SCG15-P01/SCG15-P02)
|
| Presentation No |
Title |
Author |
Presenter |
Abstract |
|
Poster Presentation May 24 Core Time (18:15-19:30) Convention Hall to the top
|
|
SCG15-P01
|
Towards Seismoelectric Inversion: Sensitivity Analysis using Resolution Functions
|
GROBBE, Niels
MAAS, Peter
SLOB, Evert
other
|
GROBBE, Niels
|
|
|
SCG15-P02
|
Application Prospects of SKZ-1 4-component borehole strain meter
|
KONG, Xiangyang
SU, Kaizhi
FUJINAWA, Yukio
|
KONG, Xiangyang
|
|