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| Titel |
Crustal structure of the southern Taiwan comprehended from wide-angle reflection/refraction seismic data |
| VerfasserIn |
H. J. Hsu, C. H. Chen |
| Konferenz |
EGU General Assembly 2009
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250022386
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| Zusammenfassung |
| Taiwan is located at the convergent boundary of the Eurasia Plate and the Philippine Sea
Plate. Because of the arc-continent collision in the region, Taiwan is recognized as a complex
and tectonically active area with thousands of earthquakes occurred annually. The most
devastating earthquake occurred in Taiwan for the last decade is the 1999 Chi-Chi
earthquake. This earthquake not merely inflicted heavy casualties but further exposed the
complexity of tectonic structures in Taiwan. In order to understand the seismotectonic
structures beneath Taiwan more precisely, a cooperated project supported by both Taiwan and
USA called the Taiwan Integrated Geodynamic Research (TAIGER) has carried out
beginning from the year of 2008 to comprehend the lithospheric structures beneath Taiwan
through large-scale active seismological experiments across Taiwan and the surrounding
oceans. The TAIGER project provides very high quality seismic data. We have applied the
data set in different geophysical studies. We believe that the project will lead us to
have better insight into the seismotectonic structures beneath Taiwan in different
perspectives.
Four transects were set up in the TAIGER project, including two E-W direction transects
and two N-S transects. For the E-W transects, one is from Taoyuan to Yilan, while the other is
fom Chiayi to Taidong. Furthermore, we have also set up 9 ocean bottom seismometers
(OBS) in the Taiwan Strait and 20 seismometers in the Mainland China to be the extensions
of this two E-W transects. For the N-S transects: the eastern one is from Hualien to Taidong,
and the western one is from Yilan to Kaohsiung. We have deployed 600 PASSCAL Texans
and 40 R-130 seismometers to record the data generated by 10 artificial seismic sources in
this experiment.
The main goal of this study is to use seismic waveform recorded by the southern array
with 609 seismometers to investigate 3D velocity structure and the characteristics of the
Moho discontinuity in southern Taiwan. We first obtain the travel times of different crustal
phases after seismic signal processing. Thereafter, we will apply the superior inversion
method to investigate the velocity structure and the Moho discontinuity as well. We expect
that more detailed seismic structures can be obtained from this study. It will help
us to understand the geologically and tectonically evolutions in southern Taiwan. |
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