Workshop 04-06 July 2016

「活断層破砕帯の特性と年代測定」
Properties of active fault damage zones and fault dating
Horst Zwingmann, Aiming Lin and Takahiro Tagami
Division of Earth and Planetary Sciences
Department of Geology and Mineralogy
Department of Geophysics
Kyoto University
Venue: Science seminar house, Yoshida North Campus, Kyoto University
INTRODUCTION

最近活動があった断層帯の調査は地震被害の緩和政策に貢献することができる。特に最近の断層活動の時期、繰り返しの周期と地震発生の確率などを含めた、潜在的な地震の震源地とその原因となり得る断層の活動を特定することは有益である。
このワークショップの目的は、断層破砕帯の特性・過程と、野外調査・トレンチング・ボーリングから得た断層帯物質の年代測定についてよりよく理解するために、異なる分野から知識を集めることである。
ワークショップでは、現地調査、トレンチと採掘の調査、断層岩石の年代測定、ラボ実験などに基づいて、地質学、地球物理学、地球年代学、熱年代測定研究など様々な分野の立場から議論する予定である。
Assessment of recent activity of fault zones has a direct societal application in themitigation of earthquake hazards, especially the identification of potential seismogenic
sources and the activity of the source faults including the timing of recent faulting event,recurrence interval and probability of earthquake occurrence.

The scope and goal of this workshop is to bring together different disciplines enhancing
our knowledge on the properties and processes of fault damage zones and dating of fault
rock materials from field, trench and drilling of fault zones.

Multi-disciplinary contributions from geological, geophysical, geochronological andthermo-chronological studies based on the field observations, trenching and drillinginvestigations, dating fault rock samples, and lab-experiments will be discussed during
the workshop.

WORKSHOP OUTLINE
Day 1: 4 July 2016: Nojima fault zone: Previous studies and geochemistry.
Day 2: 5 July 2016: Rock physics and structural geology.
Day 3: 6 July 2016: Field trip Nojima fault zone drilling and Nojima Fault
Preservation Museum, Awaji Island. [Restricted access, due to bus capacity]

WORKSHOP PROGRAM
Day 1

04/07/2016

8:30-8:45

Welcome9:15-10:00

Aiming LinKyoto
University

Property of active fault damage zone andassessment of fault activity

1819

Norio
Shigematsu
GSJ AIST

Overview of geophysical studies in the Nojima
Fault Zone Probe Project-Repeated water injection
experiments and borehole measurements
Evaluation of faults in a site of power plants andstress analyses

Drilling investigations on the structure andmechanics of active fault - a case history of Nojima
fault at Kobe earthquake 1995 -22

Meteoric fluids in fault and detachment systems

2425

8:45-9:15

10:00-10:15
10:15-11:00
11:00-11:45
11:45-12:30

Previous studies and geochemistry

HorstZwingmann
Kyoto
University

Workshop introduction and house keeping

BREAK

Opportunity to view student posters

Kinya
Nishigami
DPRI Kyoto
University

Kentaro Omura
NIED

12:30-13:30

LUNCH BREAK

14:15-15:00

Takahiro
Tagami
Kyoto
University

Overview of low-temperature thermochronology
with implications for thermal processes anddating of fault zones

BREAK

Opportunity to view student posters

13:30-14:15

15:00-15:45
15:45-16:00
16:00-16:30
16:30-17:15
17:15-18:00

Andreas Mulch
UniversityFrankfurt

Noriko Hasebe
Kanazawa
University

Seiko Yamasaki
GSJ AIST
Pereach Nuriel
Geological
Survey of Israel
DISCUSSION

Workshop group photo

page #21

Potential of thermoluminescence method toestimate the time-temperature condition of fault
activity

26

K-Ar dating of fault gouges - Case studies for
granite-origin gouges within Japanese faults

28

Calcite U-Pb ages constrain dead sea fault activity

30DAY 2

5/07/16

8:15-8:30

Welcome9:15-10:00

Masa Niwa
JAEA GIFU

8:30-9:15

10:00-10:30
10:30-11:15
11:15-12:00
12:00-12:45
12:30-13:30
13:30-14:15
14:15-14:45
14:45-15:15
15:15-15:45
15:45-16:15
16:15-16:45
16:45-17:30
17:30-18:00
DAY 3~ 8:30-17:00

Rock physics and structural geology

Akito Tsutsumi
Kyoto University

Frictional properties of rocks at seismic slip rate:a brief review

BREAK

Opportunity to view student posters

Giulio ViolaNGU

Study on faulted materials for an assessment offault activity in JAEA: Structural andgeochronological approaches

page #31
32

Deconvoluting complex structural histories
archived in brittle fault zones

34

Microstructural Analysis — A Key to theSuccessful Dating of Faults

38

TakakoSatsukawa
Kyoto University

Formation of pseudotachylyte in the lower crust
plastic regimes

39

Dawn Kellett
Geological
Survey Canada

Influence of shear zone deformation and fluids
on Ar retention in white mica

42

Dating paleoseismicity in the Himalayan orogen

44

Brittle Fault zone investigations and dating what do we know and what not

45

Jussi Mattila
POSIVA

Espen Torgersen
NGU
LUNCH BREAKKoki Kashiwaya
Kyoto University

BREAK

Catherine
MottramDalhousie
University

HorstZwingmann
Kyoto University
DISCUSSION

Geological characterization and monitoring offaults at the site of an underground repository ofhigh-level nuclear waste, Olkiluoto, Finland

Spatial variation of permeability around faults inToki granite

Opportunity to view student posters

3641

WRAP UP

6/07/16
Masaki
Murakami
OYO

Field trip Nojima drilling site
Introduction to boreholes in the 2016 Nojima
active fault zone drilling project
Visit Nojima Fault Preservation Museum, Awaji
Island46