Dear Sir/Madam,
Due to circumstances beyond our control, we regret to inform you that HAGI
Jakarta Chapter Luncheon Talk that was scheduled for March 23rd , 2004 has
been rescheduled. It will now be held on March 30th, 2004. We will be
mailing out formal invitations with the revised date and place as soon as
possible. Please make a note of this change.
We certainly apologize for any inconvenience that this change might have
caused. We also would be glad and thank you for your flexibility in dealing
with our new schedule.
It will NOT be rescheduled again!
See you in a couple of weeks!
Thank you for your attention to this matter. Should you have queries,
please feel free to contact Hary Setyabudi at email
[EMAIL PROTECTED] or phone 515-9300.
Sincerely,
HAGI Jakarta Chapter Committee
Here are the latest details and we'll keep you informed of any changes.
HAGI (Indonesian Association of Geophysicists) Jakarta Chapter cordially invites you
to a luncheon talk as follows:
TOPIC : "NEW INSIGHTS OF TECTONICS OF THE INDONESIAN REGION
FROM SEISMIC TOMOGRAPHY: IMPLICATION FOR NEW
BASIN DEVELOPMENT"
DATE / TIME : Tuesday, March 30, 2004 / 11:45
VENUE : Hotel Sahid Jaya Jakarta, Andrawina Room,
Jl. Jend. Sudirman 86, Jakarta, 10220
SPEAKER : SRI WIDIYANTORO, Ph. D. (ITB).
COST : Rp. 130.000,-
ü Reservations and cancellations will be accepted until 15:30 hours on
Friday, March 19, 2004 at email: [EMAIL PROTECTED] or fax:
515-9344, or phone 515-9300 (Hary).
ü Payment will be done at the Andrawina Room, and no show will be
charged.
ü Members of IAGI, IPA, and IATMI are welcome.
ABSTRACT
NEW INSIGHTS OF TECTONICS OF THE INDONESIA REGION
FROM SEISMIC TOMOGRAPHY
: IMPLICATION FOR NEW BASIN DEVELOPMENT
The tectonic setting of the Indonesian archipelago is determined by the
complex interaction of several major and minor plates. Given this tectonic
setting, it can be expected that the junction of island arcs overlies a
strongly heterogeneous mantle. This structural complexity is only partly
evident from regional seismicity. Therefore, seismic tomography - a
powerful tool to produce three-dimensional images of the Earth's mantle -
would be useful to investigate the complex mantle structure beneath the
Indonesian region.
New seismic tomographic models for the Indonesian subduction zone was
derived by using a non-linear approach that employs three-dimensional ray
tracing. High-quality P and S travel times have been used to construct
compressional, shear, Vp/Vs (Poisson's ratio) and bulk-sound speed models.
These models confirm previously reported structures e.g. the reversed
U-shape structure associated with the two opposing subduction directions of
the Molucca Sea plate, and the spoon-shaped feature of descending slab
beneath Banda. Moreover, a detailed look at these models has led to new
observations e.g. (i) slab detachment beneath Sumatra; (ii) a low
compressional anomaly confined in the uppermost mantle below central Java;
(iii) a complex backarc structure of Bali; and (iv) a pronounced, fast
wavespeed anomaly in the mantle transition zone below the Bird's Head of
Papua. These new observations respectively suggest that (i) new basin
development may propagate from west to east along the Sunda arc; (ii)
seismic gap oceanward of central Java - which may have been manifested by
the thinning of the Java island - is related to chemical heterogeneity;
(iii) the crust located to the north of Bali is being sucked by the
downgoing Indo-Australian plate forming a potential source for tsunamigenic
earthquakes; and (iv) eastern Indonesia represents the most actively
subsiding area on the planet. Understanding the subsidence history would be
very important for basin analysis used in the oil industry.
ABOUT THE SPEAKER
Sri Widiyantoro, Ph.D. in Geophysics Seismology from Australia National
University and Postdoc in Seismic Tomography from Tokyo University. He is
now an Associate Professor of Geophysics in Bandung Institute of Technology
(ITB).
He has been awarded The Doornbos Memorial Prize by the International Union
of Geodesy and Geophysics Australia for his work on the delineation of the
3D structure of earth, in 1996
He studied seismic tomography on regional and global scale since 1997, and
based on his studies, he has written many articles, papers, and journals on
national and international publications. He is now an active member of
IASPEI and IUGG, as well as the chairman of the international working group
on subduction zones.
He has been doing many research projects in several institution such as
Massachusetts Institute of Technology (1996 and 2001), Australian National
University (1998), Hiroshima Institute of Technology (2000) and Karlsruhe
University (2000 and 2002).
--
paulus
ConocoPhillips Indonesia
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