Kerry Sieh TO Annual Meeting 8 November 2006
39
Kerry Sieh TO Annual Meeting 8 November 2006 Submerging forest on the Mentawai islands, West Sumatra Behavior of the Sunda Megathrust Behavior of the Sunda Megathrust in Sumatra in Sumatra
description
Behavior of the Sunda Megathrust in Sumatra. Kerry Sieh TO Annual Meeting 8 November 2006. Submerging forest on the Mentawai islands, West Sumatra. Caltech John Galetzka Mohamed Chlieh Don Helmberger - PowerPoint PPT Presentation
Transcript of Kerry Sieh TO Annual Meeting 8 November 2006
Kerry Sieh
TO Annual Meeting8 November 2006
Submerging forest on the Mentawai islands, West Sumatra
Behavior of the Sunda Megathrust Behavior of the Sunda Megathrust in Sumatrain Sumatra
Behavior of the Sunda Megathrust Behavior of the Sunda Megathrust in Sumatrain Sumatra
Caltech John Galetzka Mohamed Chlieh Don Helmberger JP Avouac Aron Meltzner Ozgun Konca Yaru Hsu Mark Simons Andrew Kositsky
Indonesian Institute of Sciences
Danny Natawidjaja Bambang SuwargadiNughroho Hanato
Dudi PrayudiImam Suprihanto
Scripps Yehuda Bock et al
CollaboratorsCollaborators
Kyoto University Shigehiro Fujino
USC
Costas Synolakis
Jose Borrero
Segments that produce great earthquakes
Segments that are principally aseismic
Down-dip variations
1797
1833from Natawidjaja et al, JGR, 2006
Segments that produce great earthquakes
from Natawidjaja et al, JGR, 2006
1797
from Natawidjaja et al, JGR, 2006
1833
from Natawidjaja et al, JGR, 2006
1833
2004from Subarya et al., Science, 2006
2004from Chlieh et al,
BSSA, in press
2005 from Briggs et al, Science, 2006
2005 from Briggs et al, Science, 2006
Down-dip variations
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
Simeulue Saddle
Segments that are principally aseismic
from Briggs et al, 2006, Science
The Simeulue SaddleThe Simeulue Saddle
Misalignment of ridge crests
~ 60 km
from Briggs et al, 2006, Science
Why? The misalignment suggests a structural cause
from Briggs et al, 2006, Science
The Equatorial patch
Small emergences during four giant earthquakes
Large emergence during the Mw 7.7 1935 earthquake
from Natawidjaja, 2003, PhD
The Enggano patch
from Chlieh et al, in preparation
From Chlieh et al, in
preparation
The permanence
of patch behavior
How often does the Mentawai
patch rupture?
Are couplets like 1797 and 1833 typical?
Bulasat
Simanganya
Years (AD)
Elevation relative to m
odern sea level~1370 ~1600 1797 & 1833
Paleoseismic
records
Bulasat
Simanganya
Years (AD)
Elevation relative to modern sea level
~1370 ~1600 1797 & 1833
Time-predictable?
Toward the application of
basic science for human benefit
Tsunami modeling
Educational outreach
For more information, see Sieh 2006 Proc Royal Soc
10-m slip
Nias-Simeulue tsunario
20-m slip
Aceh-Andaman tsunario
Tsunami modeling
10-m slip
Padang
population ~800,000
10-m slip
Bengkulu
population ~350,000
QuickTime™ and aH.264 decompressor
are needed to see this picture.
Our new educational poster
for residents
of the Sumatran
and Mentawai
island coasts
Where do we go from here?
From Chlieh et al, in
preparation
From Chlieh et al, in
preparation
From Chlieh et al, in
preparation
From Chlieh et al, in
preparation
