ccop-gai international symposium on tsunami risk...
TRANSCRIPT
GSJ 1st Workshop of Asia-Pacific Region Global Earthquake and Volcanic Eruption Risk Management
Tsukuba, Japan, Feb, 22-25, 2012
Bui Cong Que and Nguyen Hong Phuong
Institute of Geophysics Vietnam Academy of Science and Technology
EARTHQUAKE AND TSUNAMI HAZARD ASSESSMENT IN COASTAL AREAS OF VIETNAM
AND MEARURES FOR SEISMIC RISK MITIGATION
CONTENTS
• Introduction
• Seismicity and seismotectonics
• Earthquake hazard evaluation
• Identification of Tsunami source zones
• Tsunami affects evaluation
• Measures for Earthquake and Tsunami hazard mitigation
• Vietnam National System for Earthquake information and Tsunami warning
• Conclusion
COASTAL AREAS OF VIETNAM
• Coastline length: 3260km, 2600 Islands
• 4 main coastal area: North-Northeastern, Central, Southeastern and Southwestern areas
• Population: 20 millions
• Big cities: Halong, Haiphong, Danang, Nhatrang, Vungtau.
• 12 industrial zones, 18 big ports, 25 tourism zones
Study area and seismicity
of southeast region
MAIN RESEARCH PROJECTS ON EARTHQUAKE AND TSUNAMI HAZARD ASSESSMENT IN VIETNAM
• Study of Earthquake and Tsunami hazard in Coastal area of Vietnam, Vietnam Academy of Science and technology, Nguyen Dinh Xuyen (2005 - 2006)
• Evaluation of Tsunami hazard in coastal zone of Vietnam. Vietnam Academy of Science and technology. Tran Thi My Thanh (2006 - 2007)
• Numerical Modeling for possible Tsunami scenarios affecting coastal areas of Vietnam. Ministry of Environment and resources. Vu Thanh Ca (2007 - 2008)
• Tsunami Hazard and Risk assessment and preparedness for Vietnam. Vietnam – New Zealand Cooperation project. Bui Cong Que, IGP and Terry Webb, GNS, (2007 - 2009)
• Study of Earthquake and Tsunami Hazard assessment in Coastal areas of Vietnam and mitigation measures. Vietnam National Research project. Bui Cong Que, (2007 – 2010)
STUDY OF SEISMICITY AND SEISMOTECTONICS
• Seismicity of Vietnam and Eastern sea
• Seismicity of Southeast Asia region
• Seismotectonics of Vietnam
• Geodynamic and recent tectonic movement
• Study of active tectonic faults
• Study of volcanic and landslide activities in the offshore areas
SESMICITY OF VIETNAM AND EASTERN SEA
• Catalog of Earthquake with:
+ M ≥ 5 on data of ISC (1900-2008)
+ M ≥ 3 on data of local seismic network and historic data.
• Study area: 1°N - 24°N, 99°E - 125°E.
• Total 8955 Earthquakes with:
+ 2086 ~ M = 5 – 5,9
+ 331 ~ M = 6 – 6,9
+ 78 ~ M = 7 – 7,9
+ 10 ~ M ≥ 8 Distribution of epicenters
in Vietnam and Eastern Sea
SESMICITY OF VIETNAM AND EASTERN SEA
• Maximum Earthquake evaluation
+ Earthquake energy estimation:
log E = 11,8 + 1,5M
• Distribution of epicenters on the Depth:
0 40 80 120 160 200
0
10
20
30
40
50 %
h(km)
Mmax for Vietnam territory
Mmax for Eastern Sea of Vietnam
Seismotectonic scheme of Southeast Asia region
Structural and Tectonic Map
in Vietnam and adjacent areas
STUDY OF GEODYNAMICS AND RECENT TECTONIC MOVEMENT
• Study of the active faults in Pliocene – quaternary sediment
STUDY OF GEODYNAMICS AND RECENT TECTONIC MOVEMENT
• Study of recent tectonic movement on GPS network
Crustal motion
for 2007, 2008, 2009
Crustal motion on the Projects GEODYSSEA, PCGIAP, SEAMERGES
Scheme of geodynamics and modern tectonic movements
SCHEME OF ACTIVE TECTONIC FAULTS
• Data of gravity and magnetic anomalies
• Seismic profiling data of high resolution
• Data of seismicity
• Data of volcanic activities
Method
- Probabilistic approach: Cornell A.C. method (1968)
- Seismic hazard is calculated by
where P indicates probability, A is the event whose
probability is sought, and m and r are continuous,
independent random variables which influence A. In our
case, A represents the event that a specific value of ground
motion intensity is exceeded at the site of interest during an
earthquake, variables m and r represent earthquake size
(magnitude) and distance from the site of interest.
EARTHQUAKE HAZARD ASSESSMENT
EARTHQUAKE HAZARD ASSESSMENT
Procedure
1. Determination of seismic source zones in the study
area;
2. Estimation of earthquake hazard parameters for each
source zone
3. Choosing an attenuation equation for the study area;
4. Seismic Hazard computation and mapping.
1. EQRISK program by McGuire (1974)
2. CRISIS99 program by Ordaz (1999)
Tools
EARTHQUAKE HAZARD ASSESSMENT
Input Data
• An Earthquake catalog of Vietnam and adjacent sea
areas for the period from 114 to 2008 including 3197
events, compiled by the Institute of Geophysics, VAST.
The catalog incorporates all historical as well as
instrumental data collected from various sources (ISC,
USGS, NEIS, BEJ ).
EARTHQUAKE HAZARD ASSESSMENT
EARTHQUAKE HAZARD ASSESSMENT
Input Data
Parameter estimation
The following earthquake hazard parameters,
characterizing level of seismicity, were estimated for all
seismic source zones in the territory of Vietnam and
adjacent sea areas:
• Expected maximum magnitude Mmax;
• Constants a, b in the Gutenberg-Richter magnitude-
frequency relation and their deductive values α and β;
• Mean return period T(M) of the strong earthquakes with
magnitude M.
EARTHQUAKE HAZARD ASSESSMENT
Attenuation relationship
The Campbell (1997) attenuation relationship was chosen for application:
ln(AH) = -3.512+0.904 Mw -1.328ln{R2SEI+[0.149 exp(0.647 Mw)]2
+[1.125-0.112ln(RSEI) - 0.0957 Mw]F+[0.440-0.171ln(RSEI)] SSR
+[0.405-0.222ln(RSEI)] SHR +
where: AH is horizontal PGA, in g (g = 981 cm/s2). Rseis is the closest
distance from the site to the zone of the seismogenic rupture, Mw is the
moment magnitude of the earthquake, F is a fault type flag: GRS = 1 for
reverse-slip faults, 0 otherwise, SSR and SHR are site coefficients: for soft
soils SSR = SHR = 0; SSR =1, SHR =0 for soft rocks; SSR=0, SHR= 1 for
hard rock and is the standard deviation, with = 0.4095.
EARTHQUAKE HAZARD ASSESSMENT
MAP OF EARTHQUAKE HAZARD IN NORTH AND CENTRAL COASTAL AREAS OF VIETNAM. RETURN PERIOD 950 YEARS, SITE A
MAP OF EARTHQUAKE HAZARD IN SOUTHERN COASTAL AREAS OF VIETNAM. RETURN PERIOD 950 YEARS, SITE A
IDENTIFICATION OF TSUNAMI SOURCE ZONES
Scheme of tsunamigenic zones in Southeast Asia
Catalog of tsunamis in Southeast Asia
Tsunami source zones in South China Sea region
Zones of volcanoes in the South China Sea
Zone of potential of landslides
Scheme of tsunamigenic faults in Southeast Asia
Tsunami source zones in South China Sea region
Neotectonic activities along coastal zone in the north part of Vietnam
L ¹ n g S ¬ n
B ¾c C ¹ n
Hµ Né I
H µ T ©y
H µ N a m
N in h B ×n h
T h ¸ i B ×n h
H ¶ i D ¬ n g
T h a n h H ã a
N g h Ö A n
H ß n M ª
H ß n M ¸ t
Q u ¶ n g B ×n h
Q u ¶ n g T r Þ
H u Õ
§ µ N ½n g
Q u ¶ n g N a m
Q u ¶ n g N g · i
B ×n h § Þn h
C ï L a o X a n h
C ï L a o C h µ m
K h ¸ n h H ß a
N in h T h u Ën
B ×n h T h u Ën
B ×n h P h í c
T iÒn G ia n g
K iª n G ia n g
T r µ V in h
S ã c T r ¨ n g
B ¹ c L iª u
C µ M a u
H ß n K h o a i
H ß n § ¸ L Î
H ß n T rø n g B Ð
H ß n T rø n g L í n
C « n § ¶ o
H¶ i Na m
B · i § ¸ B ¾c
§ ¶ o H o µ n g S a
§ ¶ o Q u a n g ¶ n h
C å n § ¸ L í n
§ ¶ o B ¸ c h Q u ý§ ¶ o B ã n g B a y
§ ¶ o C h ©n Y Õn
§ ¶ o P h ó L ©m § ¶ o § ¸
§ ¶ o T r u n g
§ ¸ L ¸ t
§ . T r ê n g S a
B · i H u y Òn T r ©n
B · i V ò n g M ©y
B · i P h ó c N g u y ª n
B · i T C h Ýn h
B ¹ c h L o n g V Ü
100 108 110 112
22
20
18
16
14
12
10
8
1 0 0 0
5 0 0 0
6 5 0 0
3 0 0 0
2000 1 0 0 0
5 0 0 0 3 0 0 0 1 0 0 0
7 0 0 0
1000
1 0 0 0
2 0 0 0
9 5 0 0
500
0
5 0 0 0
10000
3 0 0 0
1000
5000
1 00 0 0
15000
4000
1000
1 0 0 0
10000
5000
2000
3000
3 0 0 0
2000
1000
800
0
1000
500
0
1000
60
00
6000
500
0
50
00
6 0 0 05 0 0 0
3 0 0 0
2000
100
0
3000
2000
3 0 0 0
3 0 0 0
5 0 0 0
7000 5
000
6 0 0 07 0 0 0
5 0 0 0
7000
6 0 0 0
10000
11000
1000
5 0 0 03 0 0 0
4 0 0 0
8 0 0 0
1 2 0 0 0
6 0 0 0
6000
1 5 0 0
1000
5 0 0 0
6 5 0 0
5 0 0 0
1 0 0 0
1000
2000
2500
1 0 0 0
1000
5000
8000
1 0 0 0
1 0 0 0
1 0 0 0 0500
0
Bå n t r ò n g Be j b u w a n
Bån tròng s«ng hång
Bå n t r ò n g n a m h ¶ i n a m
Bå
n t
rò
ng
Ph
ó k
h¸
nh
®íi t¸ch g
i·n b
iÓn ®
«ng
®íi t
rît c
¾t tuy h
ßa
Th Òm p
h an ran g
Th Òm v ò n g t µu
Bå n t r ò n g c ö u l o n g
®íi n
©ng c
«n s
¬n
Bå n t r ò n g n a m c « n s ¬ n
®í i n©n g c
« n s¬ n
Bå n t r ò n g t c h Ýn h - v ò n g m©y
The seismic section
Neotectonic activities along coastal zone in the cental part of Vietnam
L ¹ n g S ¬ n
B ¾c C ¹ n
Hµ Né I
H µ T ©y
H µ N a m
N in h B ×n h
T h ¸ i B ×n h
H ¶ i D ¬ n g
T h a n h H ã a
N g h Ö A n
H ß n M ª
H ß n M ¸ t
Q u ¶ n g B ×n h
Q u ¶ n g T r Þ
H u Õ
§ µ N ½n g
Q u ¶ n g N a m
Q u ¶ n g N g · i
B ×n h § Þn h
C ï L a o X a n h
C ï L a o C h µ m
K h ¸ n h H ß a
N in h T h u Ën
B ×n h T h u Ën
B ×n h P h í c
T iÒn G ia n g
K iª n G ia n g
T r µ V in h
S ã c T r ¨ n g
B ¹ c L iª u
C µ M a u
H ß n K h o a i
H ß n § ¸ L Î
H ß n T rø n g B Ð
H ß n T rø n g L í n
C « n § ¶ o
H¶ i Na m
B · i § ¸ B ¾c
§ ¶ o H o µ n g S a
§ ¶ o Q u a n g ¶ n h
C å n § ¸ L í n
§ ¶ o B ¸ c h Q u ý§ ¶ o B ã n g B a y
§ ¶ o C h ©n Y Õn
§ ¶ o P h ó L ©m § ¶ o § ¸
§ ¶ o T r u n g
§ ¸ L ¸ t
§ . T r ê n g S a
B · i H u y Òn T r ©n
B · i V ò n g M ©y
B · i P h ó c N g u y ª n
B · i T C h Ýn h
B ¹ c h L o n g V Ü
100 108 110 112
22
20
18
16
14
12
10
8
1 0 0 0
5 0 0 0
6 5 0 0
3 0 0 0
2000 1 0 0 0
5 0 0 0 3 0 0 0 1 0 0 0
7 0 0 0
1000
1 0 0 0
2 0 0 0
9 5 0 0
5000
5 0 0 0
1 0 0 0 0
3 0 0 0
1000
5000
1 0 0 0 0
1 5 0 0 0
4000
1 0 0 0
1 0 0 0
10000
500 0
2 0 0 0
3000
3 0 0 0
2000
1000
8000
1000
500
0
1000
60
00
6000
500
0
50
00
6 0 0 05 0 0 0
3 0 0 0
2000
100
0
3 0 0 0
2000
3 0 0 0
3 0 0 0
5 0 0 0
7000 5
000
6 0 0 07 0 0 0
5 0 0 0
7000
6 0 0 0
10000
11000
1000
5 0 0 03 0 0 0
4 0 0 0
8 0 0 0
1 2 0 0 0
6 0 0 0
6000
1 5 0 0
1000
5 0 0 0
6 5 0 0
5 0 0 0
1 0 0 0
1000
2 0 00
2500
1 0 0 0
10 0 0
5000
8000
1 0 0 0
1 0 0 0
1 0 0 0 0
500
0
Bå n t r ò n g Be j b u w a n
Bån t
ròng s
«ng h
ång
Bå n t r ò n g n a m h ¶ i n a m
Bå
n t
rò
ng
Ph
ó k
h¸
nh
®íi t¸ch g
i·n b
iÓn ®
«ng
®íi t
rît c
¾t t u
y h
ßa
Th Òm p
h an ran g
Th Òm v ò n g t µu
Bå n t r ò n g c ö u l o n g
®íi n
©ng c
«n s
¬n
Bå n t r ò n g n a m c « n s ¬ n
®í i n©n g c
« n s¬ n
Bå n t r ò n g t c h Ýn h - v ò n g m©y
The seismic section
L ¹ n g S ¬ n
B ¾c C ¹ n
Hµ Né I
H µ T ©y
H µ N a m
N in h B ×n h
T h ¸ i B ×n h
H ¶ i D ¬ n g
T h a n h H ã a
N g h Ö A n
H ß n M ª
H ß n M ¸ t
Q u ¶ n g B ×n h
Q u ¶ n g T r Þ
H u Õ
§ µ N ½n g
Q u ¶ n g N a m
Q u ¶ n g N g · i
B ×n h § Þn h
C ï L a o X a n h
C ï L a o C h µ m
K h ¸ n h H ß a
N in h T h u Ën
B ×n h T h u Ën
B ×n h P h í c
T iÒn G ia n g
K iª n G ia n g
T r µ V in h
S ã c T r ¨ n g
B ¹ c L iª u
C µ M a u
H ß n K h o a i
H ß n § ¸ L Î
H ß n T rø n g B Ð
H ß n T rø n g L í n
C « n § ¶ o
H¶ i Na m
B · i § ¸ B ¾c
§ ¶ o H o µ n g S a
§ ¶ o Q u a n g ¶ n h
C å n § ¸ L í n
§ ¶ o B ¸ c h Q u ý§ ¶ o B ã n g B a y
§ ¶ o C h ©n Y Õn
§ ¶ o P h ó L ©m § ¶ o § ¸
§ ¶ o T r u n g
§ ¸ L ¸ t
§ . T r ê n g S a
B · i H u y Òn T r ©n
B · i V ò n g M ©y
B · i P h ó c N g u y ª n
B · i T C h Ýn h
B ¹ c h L o n g V Ü
100 108 110 112
22
20
18
16
14
12
10
8
1 0 0 0
5 0 0 0
6 5 0 0
3 0 0 0
2000 1 0 0 0
5 0 0 0 3 0 0 0 1 0 0 0
7 0 0 0
1000
1 0 0 0
2 0 0 0
9 5 0 0
5000
5 0 0 0
10000
3 0 0 0
1000
5000
1 00 0 0
15000
4000
1000
1 0 0 0
10000
5000
2000
3000
3 0 0 0
2000
1000
8000
1000
500
0
1000
60
00
6000
500
0
50
00
6 0 0 05 0 0 0
3 0 0 0
2000
100
0
3000
2000
3 0 0 0
3 0 0 0
5 0 0 0
7000 5
000
6 0 0 07 0 0 0
5 0 0 0
7000
6 0 0 0
10000
11000
1000
5 0 0 03 0 0 0
4 0 0 0
8 0 0 0
1 2 0 0 0
6 0 0 0
6000
1 5 0 0
1000
5 0 0 0
6 5 0 0
5 0 0 0
1 0 0 0
1000
2000
2500
1 0 0 0
100 0
5000
8000
1 0 0 0
1 0 0 0
1 0 0 0 0
500
0
Bå n t r ò n g Be j b u w a n
Bån t
ròng s
«ng h
ång
Bå n t r ò n g n a m h ¶ i n a m
Bå
n t
rò
ng
Ph
ó k
h¸
nh
®íi t¸ch g
i·n b
iÓn ®
«ng
®íi t
rît c
¾t tuy h
ßa
Th Òm p
h an ran g
Th Òm v ò n g t µu
Bå n t r ò n g c ö u l o n g
®íi n
©ng c
«n s
¬n
Bå n t r ò n g n a m c « n s ¬ n
®í i n©n g c
« n s¬ n
Bå n t r ò n g t c h Ýn h - v ò n g m©y
Neotectonic activities along coastal zone in the south part of Vietnam
The seismic section
Seismic profiles to study landslide potential in coastal area of central and southern Vietnam
Seismic profiles VOR 93-103
Seismic profiles VOR 93-104
Seismic profiles VOR 93-105
Seismic profiles VOR 93-112
TSUNAMI AFFECT EVALUATION
Evaluation of Mw for Tsunami source zones
Calculation model for Tsunami propagation and inundation
Identification of appropriate Tsunami scenarios
Simulation of Tsunami propagation and Inundation for coastal areas of Vietnam
SOURCE PARAMETERS OF MAIN TSUNAMI SCENARIOS
Source zone Mw L (km) W(km) Dislocatio
n (m)
Strike Dip. Slip H (km)
Manila Trench
(Eastern source
zone)
8.0
8.5
9.0
160
280
500
45
80
140
5
9
15
357
357
357
40
40
40
90
90
90
20
30
30
Western source
zone
6.5
7.0
30
50
8
15
1
1.7
180
180
90
90
-90
-90
6
10
North source zone 7.0
7.5
50
90
15
25
1.7
3.0
57
57
78
78
90
90
10
17
Scenario 1: Tsunami propagation time from Manila Trench. Mw=9.0
Scenario 2: Tsunami propagation from Manila Trench. Mw=8.5
Scenario 3: Tsunami propagation from Manila Trench. Mw=9.0
Scenario 4: Tsunami inundation. Tsunami from Manila Trench. Mw=8.0
Scenario 5: Tsunami inundation. Tsunami from Manila Trench. Mw=9.0
Tsunami hazard in Coastal area of Vietnam for return period of 950 years
Tsunami hazard in Coastal area of Vietnam for return period of 2500 years.
Inundation in Nha Trang city with Tsunami wave height = 2m
Inundation in Nha Trang city with Tsunami wave height = 4m
Inundation in Nha Trang city with Tsunami wave height = 6m
MEASURES FOR HAZARD MITIGATION
Detail seismic sounding and geological investigation for meridional fault system along central and south central coastline
Conduct of earthquake and Tsunami risk assessment for central and south central coastal zone of Vietnam
Establishment of National system for earthquake information and Tsunami warring
Development of mangrove forest areas and protecting forests along coastal zone
Education and training of earthquake and Tsunami hazard preparedness for the population and community
Conduct of drill for earthquake and Tsunami preparedness and rescue
VIETNAM NATIONAL SYSTEM FOR EARTHQUAKE INFORMATION AND TSUNAMI WARNING
1. Legislation bases 2. Earthquake Information and Tsunami Warning Centre 3. Institute of Geophysics (IGP) 4. Vietnam National Seismic Network (Vietnet 2010) 5. Operation System for Earthquake Information and Tsunami
Warning
LEGISLATION BASES
1. Prime Minister decision No 264/2006/QD-TTg, November 16, 2006 on ”Regulation of earthquake information and Tsunami Warning in Vietnam”
– Information for all earthquakes with M>3,5
– Alert with tsunami warning for coastal areas and islands.
– Institute of Geophysics is an only agency responsible for earthquake information and tsunami warning in Vietnam
– Improvement of national seismic network an tidal station system to serve earthquake information and tsunami warning
– Establishment of earthquake information and tsunami warning centre
– Responsibilities of Government offices and localities authorities to support earthquake information and tsunami warning system
LEGISLATION BASES
2. Prime Minister decision No 78/2007/QD-TTg, May 29, 2007 on ”Regulation and Guideline for earthquake and Tsunami preparedness and prevention”
3. Decision No 1798/QD-KHCNVN, September 4, 2007 on establishment of the earthquake information and tsunami warning centre belong to Institute of Geophysics
4. Decision No 1798/QD-KHCNVN, December 21, 2007 on approval to project for improvement of National Network of Seismic Stations in Vietnam. Realization in period of 2008-2012
THE EARTHQUAKE INFORMATION AND TSUNAMI WARNING CENTER
• Location: Institute of Geophysics, Hanoi
• Functions: – To receive and process data and information of the seismic networks,
sea level stations and buoys
– To provide information of the earthquakes and tsunami warning to TV, radio, the Government offices and localities
– To provide guideline for earthquake and tsunami preparedness and prevention
• Working staff: 12 people
INSTITUTE OF GEOPHYSICS
Building A8, 18 Hoang Quoc Viet - Cau Giay - Hanoi
Tel: 84. 4. 7567305
Fax: 84. 4. 8364696
Institute founded in 1986 by Vietnamese Government decision No.60/HDBT/15-05-1986
RESEARCH AND DEVELOPMENT FUNCTIONS
• Investigation of geophysical fields (gravity, geomagnetic, geoelectric and geothermal)
• Investigation of seismicity and seismic zoning
• Study of the earth crustal structure and geodynamics,
• Study of atmosphere physics
• Development and application of geophysical methods of prospecting
• Earthquake information and tsunami warning in the territory of Vietnam and adjacent sea areas
• Postgraduate training in geophysics
ORGANIZATIONAL STRUCTURE
• Research departments – Seismology
– Seismic observation (seismological network)
– Geomagnetism
– Geodynamics
– Geophysical methods of prospecting
– Atmosphere physics
– Ionosphere observatory
• Administrative and management office
• Operation center for earth information and tsunami warning
• Current member of researchers: 80 (Ph.D:15, M.Sc: 20)
MAIN COMPLETED NATIONAL RESEARCH PROJECTS
• Seismicity and seismic zoning in Vietnam territory (1990)
• Seismicity and seismogenetic zones in Eastern sea of Vietnam (2000)
• Seismicity and detail seismic zoning in northeastern part of Vietnam (2005)
• Scientific and technological bases for protection of underground water resources in Vietnam (2007)
• Compilation of atlas of natural conditions and environment in sea areas of Vietnam (2005)
• Study of structure and dynamics of faults in area of Hoa Binh hydroelectric plant
• Earthquake and tsunami hazards and risk assessment in the coastal areas of Vietnam (2007-2008)
MAIN SCIENTIFIC EQUIPMENTS AND FACILITIES
• Network of 25 seismological stations in Vietnam territory
• 4 geomagnetic observatories (Sapa, Dalat, Bac Lieu, Hanoi)
• 9 atmospheric physics stations
• System of 9 teleseismic station
• Operation center for earthquake information and tsunami warning
• 15 digital seismometers
• 24 channels seismic sounding unit
• Geophysical equipments (gravity meters, magnetometers, geoelectric sounders)
• Ionosphere sounders
INTERNATIONAL COOPERATION OF IGP
VIETNAM NATIONAL SEISMIC NETWORK (VIETNET)
• Present status: 25 stations – North Vietnam: 20
– Central Vietnam: 3
– South Vietnam: 2
– Seismographs: L-4C-1D (8) and L-4C-3D (17)
T=1
• Project for Vietnet 2008-2012: 36 stations – North Vietnam: 18
– Central Vietnam: 8
– South Vietnam: 10
– Seismographs: Broadband remote seismic stations GPS systems
– Satellite system for data transmission
– Data acquisition and processing centre (in Hanoi)
Seismic Network of Vietnam
Seismic Network of Vietnam for 2010-2012
OPERATION SYSTEM FOR EARTHQUAKE INFORMATION AND TSUNAMI WARNING IN VIETNAM
Sea level stations
Tsunami buoys
Regional seismic
network
National seismic
network
Tsunami scenarios
Seismic data
processing
centre
Earthquake
information and
tsunami warning
centre
Tsunami data
processing
centre
-TV
-Radio
-Government
Offices
-Related
Agencies
-Localities related
to event
-Alert system
-TV
-Radio
-Government
Offices
-Related
Agencies
- Coastal areas
communities
M ≥
6,5
CONCLUSIONS
1. Coastal areas of Vietnam are a zones of complicated geological structure and active seismotectonics as places of meeting and crossing by most seismoactive fault systems of NW-SE direction in land and NE-SW, N-S directions faults along coastline in the sea.
2. Depending from geological structure and seismicity coastal area of Vietnam characterized by strong and differenced Earthquake hazard with PGA changes from 0,18 gal to 0,08 gal with return period of 950 years and ground A. Highest Earthquake hazard characterized for the north and north central areas, while lowest Earthquake hazard are make in the south and south central areas.
CONCLUSIONS
3. Coastal areas of Vietnam may be affected by Tsunami from source zones as Manila Trench subduction zone and seismogenic fault systems along northeast and west coastline of the South China Sea. Tsunami may have a maximum height of 6-8m with return period of 950 years in central and south central coastal areas.
4. Main measures for seismic risk mitigation in coastal areas of Vietnam are:
– Improvement and modernization of national seismic stations network
– Promotion of national system of Earthquake information and Tsunami warning in close cooperation with another national systems and international networks in the region.
– Enhancement of research and investigation in the field of seismotectonics and detail seismic hazard and risk assessment.
The end!
THANKS FOR YOUR ATTENTION!