review the 1906 meishan eart hquake and chiayi …review the 1906 meishan eart hquake and chiayi...
TRANSCRIPT
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Review the 1906 Meishan earthquake and Chiayi Transfer Zone in Central Taiwan
Yuan-Hsi LeeNational Chung-Cheng University
Taiwan earthquake model1906 Meishan earthquake ML:7.1Chiayi area
-Characteristics of the active faultsfault length; dip angle; slip rate….
-Chiayi transfer structure
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2001-2012
2
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Tectonics and Seismicity of Taiwan
3
1946
1906
1935
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1935
1946
1951
1999
1906
Active transverse structure in fold and thrust belt of Taiwan
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1935:TuntzuchiaofaultShihtan faultShenchoshan faultML:7.1Death: 3279Injury:12119Totally destroyed
houses:19729
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1935:Tuntzchiao fault
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1946:Hsinhwa fault
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Date March 17, 1906 Meishan earthquakeMagnitude 7.1 MLcasualties 1,258 dead
2,385 injured
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At 5:12 a.m. on April 18, 1906Francisco earthquake
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1906 Meishan earthquake(Omori, 1907)
Prof. Cheng
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Coseismic displacement of the 1906 Meishan earthquake (Omori, 1907)
uplift
uplift
Chiuchiungkeng fault ?
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Chungcheng unisersity
Uplift (cm)
Strike slip (cm)
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1906: Meishan fault
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1906:Meishan fault
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1906:Meishan fault
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嘉義廳(嘉義市內)前大馬路二側潰倒的民宅與散落一地的殘磚礫瓦。
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嘉義廳大莆林街(嘉義縣大林鎮)的慘狀,擔架是當時運送傷患的主要工具。大莆林街民房全倒124戶、半倒12戶、大破10戶,35人死亡、10人重傷、24人輕傷。
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Chung-Cheng Unisersity
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Yui et al.,2003
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Muchiliao active structure
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Complex faulting process
Chiayi transfer structure
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South ending process of the 1999 Chi-Chi earthquake
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1022 Mw 6.8earthquake
No surface rupture
1999 Chi-Chi earthquake
S N
2.4m
Complex ending process rather than a single tear fault
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Kukeng fault
Changhua fault
Chiuhsiungkeng fault
1. Kukeng fault & Changhua fault
2. Kukeng fault & Chiuchiungkeng fault
2. Chiai blind fault & Meishan fault
Chiayi blind thrust
Meishan fault
Chenglongpu faultWhat is the return period of each fault?
Earthquake hazard assessment?
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Cut 18540yr terrace(Hsu ,2003)Vertical displacement > 0.72 mm/yrHorizontal displacement > 15 mm/yr
Chiuchiungkeng fault
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區域地形
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Chiayi blind fault
Meishan fault
Chiayi blind fault
High angle dipping to the south
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Meishan Fault
Meishan Fault
Chiuchiungkeng FaultMeishan Fault
(Cheng, 1995)
Yang et al.,2004
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Meishan Fault
Meishan Fault
Chiuchiungkeng FaultMeishan Fault
(Cheng, 1995)
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(Cheng, 1995)
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Structure of Cretaceous TopTaihsi
Touliu
Tounan
Meishan
PeikangMinhsiung
AnticlineSyncline
Meishan Fault
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Meishan Fault
Chiuchiungkeng FaultMeishan Fault
(Cheng, 1995)Blind fault beneath the Chiungekeng fault
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Meishan Fault
Blind fault beneath the Chiuchiungkeng Fault
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ure of Cretaceous Top TouliuTounan
Meishan
eikangMinhsiung
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Yang et al.,2004
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Kukeng fault →strike slip fault : >20 Km
Meishan fault →strike slip fault: ~25 km
Chiuchiungkeng fault→ thrust fault → >17 Km
Chiayi fault →blind thrust→ > 30 Km
Liuchia fault → blind thrust → > 20 km
Muchiliao fault → blind thrust → 24 Km
Peiho fault→strike slip fault→ >13 Km
Chung Cheng University
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1.Thickness of the sedimentary basin
2.Preexisting structures
3.Changing the lithology
Basin is deeper to the south
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Lin et a.,2002
South dipping faults are easy to be triggered
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Thank you for your attention