Behavior of the Sunda Megathrust in Sumatra Submerging
Behavior of the Sunda Megathrust in Sumatra Submerging forest on the Mentawai islands, West Sumatra Kerry Sieh TO Annual Meeting 8 November 2006
Caltech John Galetzka JP Avouac Yaru Hsu Mohamed Chlieh Aron Meltzner Mark Simons Don Helmberger Ozgun Konca Andrew Kositsky Scripps Yehuda Bock et al Indonesian Institute of Sciences Danny Natawidjaja Bambang Suwargadi Nughroho Hanato Dudi Prayudi Imam Suprihanto Kyoto University Shigehiro Fujino USC Costas Synolakis Jose Borrero Collaborators
Segments that produce great earthquakes
Segments that are principally aseismic
Down-dip variations
1797 Segments that produce great earthquakes from Natawidjaja et al, JGR, 2006 1833
1797 from Natawidjaja et al, JGR, 2006
1833 from Natawidjaja et al, JGR, 2006
1833 from Natawidjaja et al, JGR, 2006
from Subarya et al. , Science, 2004
from Chlieh et al, BSSA, in 2004
2005 from Briggs et al, Science, 2006
2005 Down-dip variations from Briggs et al, Science, 2006
2005 afterslip from Hsu et al, Science, 2006
1907 tsunami ?
from Natawidjaja et al, JGR, in press An aseismic shallow rupture in about 1962 from paleogeodetic data
An aseismic shallow rupture in about 1962 from paleogeodetic data
Segments that are principally aseismic Simeulue Saddle from Briggs et al, 2006,
The Simeulue Saddle ~ 60 km Misalignment of ridge crests from Briggs et al, 2006,
Why? The misalignment suggests a structural cause from Briggs et al, 2006,
The Equatorial patch
Large emergence during the Mw 7. 7 1935 earthquake Small emergences during four giant earthquakes from Natawidjaja, 2003,
The Enggano patch
from Chlieh et al, in
The permanence of patch behavior From Chlieh et al, in
How often does the Mentawai patch rupture? Are couplets like 1797 and 1833 typical?
Paleoseismic ~1370 ~1600 1797 & 1833 records Elevation relative to modern sea level Bulasat Simanganya Years (AD)
~1370 ~1600 1797 & 1833 Elevation relative to modern sea level Time-predictable? Bulasat Simanganya Years (AD)
Toward the application of basic science for human benefit Ø Tsunami modeling Ø Educational outreach For more information, see Sieh 2006 Proc Royal Soc
10 -m slip 20 -m slip Nias-Simeulue tsunario Aceh-Andaman tsunario Tsunami modeling
10 -m slip Padang Bengkulu population ~800, 000 population ~350, 000
Our new educational poster for residents of the Sumatran and Mentawai island coasts
Where do we go from here?
From Chlieh et al, in
From Chlieh et al, in
From Chlieh et al, in
From Chlieh et al, in
- Slides: 39
