Magnitude 9.0 Sumatra-Andaman Islands Earthquake
Northeast Indian Ocean Region
Tectonic Setting
BA
INDIA
Kolkata
(Calcutta)
Colombo
NDIA PLATE
Chennai
(Madras)
YANGTZE
PLATE
CHINA
Dhaka
BURANA PLATE
MYANMAR
(BURMA)
Hanoi
AOS
BAY OF
BENGAL
Yangon
(Rangoon)
Viangchan
Vientiane)
Andaman
Andaman
Basin
SRI
LANKA
BURMA
MCROPLATE
Nicob
INDIAN
OCEAN
EXPLANATION
Main Shock
26 December 2004
o Atershocks M 2 4
- Generalized Plate Boundaries
Faults (after Pubellier et al., 2004)
✓ Thrust
T
Normal
A
Strike-Slip
Other
Volcanoes
Ninety Esst
AUSTRALIAPLATE
SCALE 20quato
7.00
400
Muco Ado
THAILAND
Khung Thep…
Bangkok)
VIET
AMBODIA NAM
Finom
Penh
SUNDA
PLATE
MALAYSIA
Kuala Lump
Sumatra
NGAPORE
ingapore
NONESIA
I
SUNDA TRENCH
Kamal
ZII
1200
1.00
Jakarta
A
J2
Magnitude 9.0
Sumatra-Andaman
Islands Earthquake of
Dec 26, 2004
■The distribution of main and
aftershock events suggests
that approximately 1200 km
of the plate boundary slipped
as a result of the 12-26-04
earthquake
■The average displacement
on the fault plane was about
15 m, with the sea floor
overlying the thrust fault
being lifted several meters
▪Energy release equivalent to
31,622 atom bombs used on
Hiroshima in 1945.
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