Relationship Between Fault and Earthquake in Sumatera Indonesia

1. PRESENTATION OF
APPLICATION OF GEODETIC TECHNIQUES TO CRUSTAL
DEFORMATION
Geomatics Departement
National Cheng-Kung University
Tainan

2. HELLO!
I Dewa Made
Adindha Surya A
M Firdaus Irsyadi
Iva Nurwauziyah

3. RELATIONSHIP BETWEEN FAULT AND
EARTHQUAKE IN SUMATERA, INDONESIA

4. Introduction
Methods and Data
Conclusion
Result and
Discussion
Outline

5. 1.
INTRODUCTION

6. “Indonesia is located at the triple junction of
the Australian Plate, Eurasian Plate, and
Pacific Plate“
“The Australian Plate is converging with the
southeastern segment of the Eurasian Plate, called
the Sunda Plate. This plate motion is oblique to the
Sumatran Subduction Zone”
“Because of these complex tectonics,
Indonesia is an earthquake-prone country.“

7. “The great Sumatra – Andaman earthquake and Tsunami of 2004 was dramatic
reminder of the importance of understanding the seismic and tsunami hazards of
subduction zones”
“Here, we shows the relationship between
those topics using two paper and what’s the
historical earthquake occured to understand
the patterns”
“There’s several earthquakes happen in Sumatran which are in March 2005 Sunda
Megathrust ruptured producing moment magnitude amount 8.6”

8. 2.
METHODS AND
DATA

9. METHODS
▹Joint Inversion of Teleseismic
▹Strong Ground Motion Data
METHODS AND DATA
To estimate 2010 of the Mentawai
tsunami earthquake rupture
process
DATA
▹IRIS – DMC and BMKG Station Near the mainshock
occured
▹InSAR and GPS measurement
 To understand partial rupture of a locked path the
Sumatera megathrust during 2017 earthquake
sequence

10. 3.
RESULT AND
DISCUSSION

11. Based on Paper 1 (Estimation of the 2010 Mentawai tsunami earthquake rupture
process from joint inversion of teleseismic and strong ground motion data)
Tectonic Map of the 2010 Mentawai Earthquake Region. An Expanded
View of The Study Region is Shown in upright Corner.

12. Joint Inversion
Result of the
Mentawai
Earthquake

13. Slip Distribution Map View for The Week After the Mainshock

14. “Paper 1 shows The 2010 Mentawai earthquake generated a locally
devastating tsunami much larger than expected based on the seismic magnitude.
”
“This paper identify this earthquake as a tsunami earthquake because of its excessively long
rupture duration and its generation of a greater than expected tsunami.”
“However, there are large differences in slip distributions from the different modeling methods
and datasets.”
“Although this paper cannot reconcile these complexities and large uncertainties on the amount
of slip still exist, this paper found the conclusion that the majority of slip occurred far from the
islands at very shallow depths to be robust”

15. Based on Paper 2 (Partial Rupture of Locked Patch of the Sumatra Megathrust
during the 2007 Earthquake Secquence)
Patches with Strong Inteseismic Coupling on the Sunda Megathrust
Coincide With Large Seismic Ruptures

16. Models of Megathrust Slip During the Mw = 8.4 and Mw = 7.9
Earthquakes Show Principal Slip on Widely Separated Patches

17. Comparison of The Moment Release Deficit Accumulated Since
the 1797 and 1833 Earthquakes

18. “Paper 2 shows shows that the rupture area of the 2007 Mentawai
earthquakes was confined to a subset of a locked portion that is surrounded by
creep during the interseismic period. ”
“Such permanent barriers, which are found to influence the down-dip extent as well as the
lateral extent of megathrust ruptures, can be imaged from the modelling of interseismic strain
except when they lie in stress shadows, inparticular along the up-dip portion of the plate interface”
“The complex spatio-temporal pattern of the 2007 rupture is probably related to the fact that it
produced much less slip than did historical earthquakes in the area. The 2007 ruptures released
only 25% of the deficit of moment that had accumulated since the last rupture.”

19. “This is probably the main reason that neither the slip-predictable nor the time-predictable
models apply, and why the 2007 earthquakes did not grow as big as the 1833 earthquake. This
supports the view that seismic asperities are probably not permanent features 28 but rather move
from one rupture to another within the area that is locked in the interseismic period”
“Such permanent barriers, which are found to influence the down-dip extent as well as the
lateral extent of megathrust ruptures, can be imaged from the modelling of interseismic strain
except when they lie in stress shadows, inparticular along the up-dip portion of the plate interface”
“Some of these barriers are most likely not permanent and are related to the slip in past
earthquakes. Whereas permanently creeping barriers should tend to favour some regularity and
similarity of earthquakes, the presence of non-permanent barriers due to the stress distribution left
over from previous ruptures is probably the major factor introducing irregularity, as observed in
dynamic fault models.”

20. 4.
CONCLUSION

21. First
- These Earthquakes are correspond each
other
- Besides, earthquake occurred because the
fracture between two blocks of rock allows
the blocks to move relative to each other and
the movement may occur rapidly so
earthquake happened
- The geographic of Sumatran shows the
variety of topography such as volcanoes,
seamount and etc triggered the tectonic plate
activity around Sumatra.
Second
- From two paper explains the historical of
earthquake happened in Sumatran
- From historical of earthquake in Sumatra, we can
understand about the estimation of rupture
processed
- It indicates that every earthquakes in Sumatra are
related each other along subduction zone or
coupling zone. It can influence one to another faults
to move rapidly or slowly (creep) around Sumatra
area.
CONCLUSION

22. THANK
YOU!