new considerations about chile’s seismic hazard sergio. barrientos scientific director
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Observatory Earthquake Readiness Workshop , La Serena Dec. 2007
New Considerations about Chile’s Seismic Hazard
Sergio. Barrientos
Scientific Director
Servicio Sismológico, Universidad de Chile
sbarrien@dgf.uchile.cl
Observatory Earthquake Readiness Workshop , La Serena Dec. 2007
Page 3
Energy Released by Earthquakes
Observatory Earthquake Readiness Workshop , La Serena Dec. 2007
Data from Engdahl and Villaseñor (2003).
Observatory Earthquake Readiness Workshop , La Serena Dec. 2007
Wadati-Benioff Zone
Barazangi and Isacks (1976)
Engdhal and Villaseñor (2003)
Observatory Earthquake Readiness Workshop , La Serena Dec. 2007
1922
Beck et al, 1998
Page 7
ThrustSismos Prisma
Outerise
Intraplaca prof. Intermedia
Corticales
Seismic Sources in Chile
fosa
costa
Observatory Earthquake Readiness Workshop , La Serena Dec. 2007
Observatory Earthquake Readiness Workshop , La Serena Dec. 2007
Barrientos (1997)
Observatory Earthquake Readiness Workshop , La Serena Dec. 2007
Chillan, 1939Beck et al., (1998)
Observatory Earthquake Readiness Workshop , La Serena Dec. 2007
Fault size:Length: 1000 kmWidth: variable 120-150 kmAverage displ: 17 mMaximum displ: 35-40 mRecurrence: At least 500-yr
Page 12
Pre-1960 Events (Cisternas et al., 2005)
Observatory Earthquake Readiness Workshop , La Serena Dec. 2007
Dec, 1949, Magallanes
Observatory Earthquake Readiness Workshop , La Serena Dec. 2007
Illapel, 1997
Outer rise1939, 1950, 2005
2004Trench
Trench
Observatory Earthquake Readiness Workshop , La Serena Dec. 2007
Mag h (km) p.a. Reference
Santiago 1945 7.1 71 0.13g Lepe y Torre (1950)
Las Melosas 1958 6.9 5 -10 0.05g Piderit y Lomnitz (1960)
La Ligua 1965 7.1 72 0.19g Malgrange et al. (1981)
La Ligua 1971 7.5 30 0.17g Malgrange et al. (1981)
M=7.5 every 110 yr
Observatory Earthquake Readiness Workshop , La Serena Dec. 2007
ES(1)
ES(2)
eM
E SR
20
Tarapacá, 2005
January 7, 2003 Mw 5.9
Tarapacá, 2005
Observatory Earthquake Readiness Workshop , La Serena Dec. 2007
03.1
83.0
)60(
3.71
R
ea
sM
91.30006.0)log(74.338.1)( rrMrI S
Attenuation relationships
Saragoni et al.
Barrientos (1981)
Montessus de Ballore Conference Santiago, Chile, Nov. 2006
Observatory Earthquake Readiness Workshop , La Serena Dec. 2007
Martin (1991)
Observatory Earthquake Readiness Workshop , La Serena Dec. 2007
Brief Update of the Earthquakes inTocopilla Mw= 7.7 andAysén Mw= 6.2
Observatory Earthquake Readiness Workshop , La Serena Dec. 2007
Graber (1997)
Page 23
Coseismic Displacement, Antofagasta30 Julio 1995 Mw=8.0
Melbourne et al.., 2002De Louis et al., 1997
Observatory Earthquake Readiness Workshop , La Serena Dec. 2007
Coseismic Displacement, Antofagasta30 Julio 1995 Mw=8.0
Observatory Earthquake Readiness Workshop , La Serena Dec. 2007
Coseismic Displacement, Tocopilla14 Nov 2007 Mw=7.7
Observatory Earthquake Readiness Workshop , La Serena Dec. 2007
Page 27
J. Cembrano (2007)
AYSÉN Marco Tectónico
Evolución de la Sismicidad
Page 28
21 Apr 06 M= 6.2
5.2
4.4
4.8
5.14.5
5.6
5.5
Page 29
Caída de Rocas, Deslizamientos y Tsunami21 Abril 2007
Page 30
Generacion de Tsunami
Page 31
Punta Tortuga
Page 32
Epicenters and Focal Mechanisms
Observatories Earthquake Readiness Workshop , La Serena Dec. 2007
Thanks a lot for yourattention
VI Congreso Chileno de Geotecnia Valparaíso, Nov. 2007
Murdie (1993)
VI Congreso Chileno de Geotecnia Valparaíso, Nov. 2007
VI Congreso Chileno de Geotecnia Valparaíso, Nov. 2007
VI Congreso Chileno de Geotecnia Valparaíso, Nov. 2007
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