EERC TEAM An Overview
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EERC TEAMAn Overview
Ragnar Sigbjörnsson
UPStrat-MAFA Workshop, Selfoss 24-27 July 2012
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Prelude• South Iceland Lowland has been our ‘field laboratory’ for
the last 25 years• Research aimed towards seismic risk reduction• Close cooperation with the local people• The Rector of the University of Iceland and the Mayor of
Árborg signed a contract in 1997 that lead to the establishment of EERC
• The Centre was officially opened in 2000
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The EERC TeamAcademic staff: Dr. Ragnar Sigbjörnsson, Professor, Director Dr. Símon Ólafsson, Research Professor Dr. Jónas Elíasson, Research Professor Dr. Benedikt Halldórsson, Assoc. Research Professor Dr. Rajesh Rupakhety, Assoc. Research Professor Sólveig Thorvaldsdóttir, MSE, Research Engineer Ásthildur Elva Bernhardsdóttir, cand oecon, MA, Rsrch Scientist Sigurdur Unnar Sigurdsson, MSc, Research Engineer Aldís Sigfúsdóttir, MSc, PE, Research EngineerVisiting Professors: Dr. Athol J. Carr, Professor Dr. John Douglas, Research Scientist Dr. Apostolos S. Papageorgiou, Professor Dr. Jónas Thór Snæbjörnsson, Professor
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Office staff: Elínborg Gunnarsdóttir, Manager Katrín Kristjánsdóttir, Research Assistant
Doctoral students:• Ævar Harðarson, MArch • Fjóla G. Sigtryggsdóttir, MSc• Ole André Oiseth, MSc
MSc-students: Teaching and Research Assistants:• Jón Einarsson Anna Beta Gísladóttir• Puja Rupakhety Einar Óskarsson• Hrafnkell Már Stefánsson Hörður Páll Steinarsson
Steinar Þór Backmann
The EERC Team
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International Cooperation
-180 -120 - 60 0 60 120 180 -90
-60
-30
0
30
60
90
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The EERC TeamParticipating in the Workshop
Dr. Ragnar Sigbjörnsson, Professor, Director Dr. Símon Ólafsson, Research Professor Dr. Rajesh Rupakhety, Assoc. Research Professor Sólveig Thorvaldsdóttir, MSE, Research Engineer Ásthildur Elva Bernhardsdóttir, MA, Research Scientist
Guests - Visiting Professors: Dr. Jónas Thór Snæbjörnsson, Professor Dr. Radan Ivanov, Professor
Office staff: Elínborg Gunnarsdóttir, Manager Katrín Kristjánsdóttir, Research Assistant
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Seismicity of Iceland An Introduction
Ragnar Sigbjörnsson
UPStrat-MAFA Workshop, Selfoss 24-27 July 2012
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Contents• Seismo-tectonics of Iceland• Earthquake catalogue data• Macroseismic field data• Strong-motion data• Seismic hazard maps
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Seismo-tectonics of IcelandReferences:
Sigbjörnsson, R & Ólafsson, S. (2004). On the South Iceland earthquakes in June 2000: strong-motion effects and damage. Bollettino di Geofisica Teorica e Applicata, 45(3): 131-152
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ICELAND
MID-ATLANTIC RIDGE
MID-ATLANTIC RIDGE
SISZ
TFZ~ 1 cm/yr
~ 1 cm/yr
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Active central volcanoes (yellow), calderas (red) and fissure swarms (green)
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Volcanic zones and earthquakeso earthquake > 4 after 1896; & recorded by IceSMN; earthquakes 2000 og 2008
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Results of GPS-measurements
O recording station; lines indicate velocity and direction
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Active plate boundary
North-American Plate
Eurasian Plate
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Volcanic zones and earthquakeso earthquake > 4 after 1896; & recorded by IceSMN; earthquakes 2000 og 2008
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Vulcanic zones, earthquakes and active plate boundary
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Earthquake in South Iceland Seismic Zone the last 100 years
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Surface fracture 21 June 2000
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Landslide 21 June 2000
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Damage to road 21 June 2000
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Damage to farm building21 June 2000
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Damage to residential house17 June 2000
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Inside a residential house 17 June 2000
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PTSD June 2000
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The Árborg Town Hall: The strong-motion array
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Ground accelerationBasement of Town Hall at Selfoss, 29 May 2009
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Response acceleration3rd floor of the Town Hall at Selfoss, 29 May 2009
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Inside the EERC building University of Iceland
29 May 2008
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The Árborg Town Hall: Displacement (cm) during the 29. maí 2008 earthquake
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Earthquake Catalogue of IcelandReferences:
Ambraseys, N.N. & Sigbjörnsson, R (1999). Re‑Appraisal of the Seismicity of Iceland, Polytechnica - Engineering Seismology, Reykjavik, ISSN 0255-9226
Ambraseys, N.N. & Sigbjörnsson (2003). On the seismicity of northwestern Europe: A comparative study of earthquake catalogues, Department of Civil and Environmental Engineering, Imperial College of Science, Technology and Medicine, London, UK, Research report number: 03-001-SM, www.imperial.ac.uk/
References in the above mentioned publications
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Parametric Catalogue for Iceland (Ambraseys and Sigbjörnsson, 2000)
Quantity Value
magnitude scale
geographic area
period
total number of events
events with recalculated magnitude
range of recalculated magnitudes
Surface-wave magnitude, MS
62°N to 68°N and 26°W and 12°W
1896 to 1996
422
276
3.0 – 7.2
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Temporal distribution of events in the Parametric Earthquake Catalogue for Iceland
1900 1920 1940 1960 1980 20000
5
10
15
20
25
30
TIME (years)
DE
NS
ITY
(num
ber/y
ear)
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Reykjavík Vatnajökull
26 W
20 W 18 W 16 W 14 W 12 W 62 N
63 N
64 N
65 N
66 N
67 N
68 N
24 W 22 W
Spatial distribution of earthquake epicentres in the Parametric Earthquake Catalogue for Iceland
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Time-line of the Parametric Earthquake Catalogue for Iceland showing surface-wave magnitude as a function of time
1900 1910 1920 1930 1940 1950 1960 1970 1980 1990 20003
3.5
4
4.5
5
5.5
6
6.5
7
7.5
8
TIME (year)
MA
GN
ITU
DE
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Distribution of surface-wave magnitudes from the Parametric Earthquake Catalogue for Iceland
2 3 4 5 6 7 80
10
20
30
40
50
60
70
80
90
100
MAGNITUDE
NU
MB
ER
OF
EV
EN
TS
3 4 5 6 7 810
-3
10-2
10-1
100
MAGNITUDE
CU
MU
LATI
VE
FR
EQ
UE
NC
Y
(a) histogram (b) cumulative distribution .
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Macroseismic Field DataReferences:
Ambraseys, N.N. & Sigbjörnsson, R (1999). Re‑Appraisal of the Seismicity of Iceland, Polytechnica - Engineering Seismology, Reykjavik, ISSN 0255-9226
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Strong-motion DataReferences:
Ambraseys, N.N. et al. (2002). ISESD – Internet Site for European Strong-Motion Data. European Com mission, Research-Directorate General, Environment and Climate Programme.
Ambraseys, N.N. et al. (2004). Internet Site for European Strong-Motion Data. Bollettino di Geofisica Teorica e Applicata, 45(3): 113-129
http://www.ISESD.hi.is
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The Icelandic Strong-motion Network, IceSMN ● ground station; ▲ power plant; ▲ dam; ▼ bridge; ■ building
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Strong-motion Data• The records are available on the Internet• ISESD – European Databank
Information ... http://www.isesd.hi.is/
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Earthquake Hazard Mapsfor structural design purposes
References:http://eerc.hi.is, the hazard maps were derived by Ragnar Sigbjörnsson in 2002
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24 W 22 W 20 W 18 W 16 W 14 W 63 N
64 N
65 N
66 N
67 N
Peak ground acceleration with 10% probability of exceedance in 50 years
> 40% g20-40% g10-20% g5-10% g2-5% g< 2% g
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24 W 20 W 18 W 16 W 14 W
63 N
64 N
65 N
66 N
67 N
22 W
Magnitude of the dominating event contributing to PGA with 10% probability of exceedance in 50 years
> 6.56.0-6.55.5-6.0< 5.5
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67 N
22 W 20 W 18 W 16 W 14 W 63 N
64 N
65 N
66 N
24 W
Source distance of the dominating event contributing to PGA with 10% probability of exceedance in 50 years
< 10 km10-20 km20-50 km50-100 km> 100 km
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Significant Duration – June 2000
1 2 5 10 20 50 1000
5
10
15
20
25
30
35
40
DISTANCE (km)
DU
RA
TIO
N (
s)
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The seismic source zones and lineaments applied in probabilistic seismic hazard analysis
Source zone
A
B1
C B2
D E
F
G
J
B3
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UPStrat-MAFA Workshop, Selfoss 24-27 July 2012