The Sunda arc is one of the most active tectonic regions, which has a complex tectonic setting due to different tectonic regimes and subduction geometry along this arc. We analyzed variation in b-value for this region in order to obtain better information regarding the state of stress in this region. For the first step, we relocated earthquake hypocenters taken from the BMKG catalog for the period 2009 – 2015 by employing a teleseismic double-difference (DD) relocation method and using a 3D velocity model. There are 10,440 earthquakes that were successfully relocated with greatly reduced residual errors. Based on its tectonic feature and earthquake distribution, we divided the study area into 8 regions, i.e. northern Sumatra, central Sumatra, southern Sumatra, Sunda strait, western Java, eastern Java, lesser Sunda islands, and Sunda-Banda transition zone. For b-value analysis we combined the BMKG catalog with the International Seismological Centre (ISC) catalog from 2006 to 2009 to obtain a longer time period. We analyzed the spatial variation in b-value for western sunda arc and found a low b-value that matches well with earthquake locations.

1.
Hall
,
R.
,
2009
,
Indonesia: geology, dalam
Gillespie
,
R.G.
,
Clague
,
D.A.
, (Editor),
Encyclopedia of islands, Berkeley
:
University of California Press
.
2.
Waldhauser
,
F.
,
Ellsworth
,
W. L.
,
2000
,
A double-difference earthquake location algorithm: Method and application to the northern Hayward fault
,
Bull. Seism. Soc. Am.
,
90
,
1353
1368
.
3.
Pesicek
,
J.D.
,
Thurber
,
C.H.
,
Zhang
,
H.
,
DeShon
,
H.R.
,
Engdahl
,
E.R.
,
Widiyantoro
,
S.
,
2010
,
Teleseismic double-difference relocation of earthquakes along the Sumatra Andaman subduction zone using a 3D model
,
J. Geophys. Res.
,
115
,
B10303
.
4.
Koketsu
,
K.
,
Sekine
,
S.
,
1998
,
Pseudo-bending method for three dimensional seismic ray tracing in a spherical earth with discontinuities
,
Geophys. J. Int.
,
132
,
339
346
.
5.
Widiyantoro
,
S.
,
van der Hilst
,
R.
,
1997
,
Mantle structure beneath Indonesia inferred from high-resolution tomographic imaging
,
Geophys. J. Int.
,
130
(
1
),
167
182
.
6.
Gomberg
,
J. S.
,
Shedlock
,
K. M.
,
Roecker
,
S. W.
,
1990
,
The effect of S-wave arrival times on the accuracy of hypocenter estimation
,
Bull. Seism. Soc. Am.
80
, pp.
1605
1628
.
7.
Chatelain
,
J.L.
,
Roecker
,
S.W.
,
Hatzfeld
,
D.
,
Molnar
,
P.
,
1980
,
Microearthquake seismicity and fault plane solutions in the Hindu Kush region and their tectonic implications
,
J. Geophys. Res.
,
85
,
1365
1387
.
8.
Kennett
,
B.L.N.
,
Engdahl
,
E.R.
,
Buland
,
R.
,
1995
,
Constraints on seismic velocities in the Earth from traveltimes
,
Geophys. J. Int.
,
122
,
108
124
.
9.
Gutenberg
,
R.
,
Richter
,
C.F.
,
1944
,
Frequency of earthquakes in California
,
Bull. Seism. Soc. Am.
,
34
,
185
188
.
10.
Wiemer
,
S.
,
2001
,
A software package to analyze seismicity: ZMAP
,
Seismological Research Letters
,
72
(
3
), pp.
373
382
.
11.
DeMets
,
C.
,
Gordon
,
R.G.
,
Argus
,
D.F.
,
Stein
,
S.
,
1994
,
Effect of recent revisions to the geomagnetic reversal time scale on estimates of current plate motions
,
Geophys. Res. Lett.
,
21
,
2191
2194
.
12.
Dziewonski
,
A. M.
,
Chou
,
T.-A.
,
Woodhouse
,
J. H.
,
1981
,
Determination of earthquake source parameters from waveform data for studies of global and regional seismicity
,
J. Geophys. Res.
,
86
,
2825
2852
.
13.
Ekström
,
G.
,
Nettles
,
M.
,
Dziewonski
,
A. M.
,
2012
,
The global CMT project 2004-2010: Centroid-moment tensors for 13,017 earthquakes
,
Phys. Earth Planet. Inter.
,
200-201
,
1
9
.
14.
Hayes
,
G.P.
,
Wald
,
D.J.
,
Johnson
,
R.L.
,
2012
,
Slab1.0: A three-dimensional model of global subduction zone geometries
,
J. Geophys. Res.
,
117
,
B01302
.
15.
Richards
,
S.
Lister
,
G.
,
Kennett
,
B.
,
2007
,
A slab in depth: Three-dimensional geometry and evolution of the Indo-Australian plate
,
Geochem. Geophys. Geosyst.
,
8
,
1
11
16.
Tormann
,
T.
,
Enescu
,
B.
,
Woessner
,
J.
,
Wiemer
,
S.
,
2015
,
Randomness of megathrust earthquakes implied by rapid stress recovery after the Japan earthquake
,
Nat. Geosci.
,
8
(
2
), pp.
152
158
.
17.
Wessel
,
P.
,
Smith
,
W. H. F.
,
1998
,
New, Improved Version of the Generic Mapping Tools Released
,
EOS Trans. American Geophys. Union
,
79
,
579
.
18.
Becker
,
J. J.
,
Sandwell
,
D. T.
,
Smith
,
W. H. F.
,
Braud
,
J.
,
Binder
,
B.
,
Depner
,
J.
,
Fabre
,
D.
,
Factor
,
J.
,
Ingalls
,
S.
,
Kim
,
S-H.
,
Ladner
,
R.
,
Marks
,
K.
,
Nelson
,
S.
,
Pharaoh
,
A.
,
Trimmer
,
R.
,
Von Rosenberg
,
J.
,
Wallace
,
G.
,
Weatherall
,
P.
,
2009
,
Global Bathymetry and Elevation Data at 30 Arc Seconds Resolution: SRTM30_PLUS
,
Marine Geodesy.
,
32
:
4
,
355
371
.
19.
Bird
,
P.
,
2003
,
An updated digital model of plate boundaries
,
Geochem. Geophys. Geosyst.
,
4
(
3
),
1027
.
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