KARAKTERISTIK ENDAPAN PALEOTSUNAMI DAERAH KULON PROGO, PROVINSI DAERAH ISTIMEWA YOGYAKARTA
The south coast of Java had experienced tsunamis that were associated with subduction zone. Kulon Progo region is in South of Java. That region is used to identify tsunamis event in the past as reference to predict tsunamis in the future. This study uses a hand core sample with TRK-02 code along...
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| Format: | Final Project |
| Language: | Indonesia |
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| Online Access: | https://digilib.itb.ac.id/gdl/view/37302 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | The south coast of Java had experienced tsunamis that were associated with
subduction zone. Kulon Progo region is in South of Java. That region is used to
identify tsunamis event in the past as reference to predict tsunamis in the future.
This study uses a hand core sample with TRK-02 code along 1 m at a depth 20-
120 cm The sample was taken in Kulon Progo, Daerah Istimewa Yogyakarta by
Research Center for Technology LIPI. The purpose of this study is to determine
the tsunamiites of Kulon Progo by grainsize, chemical element, and microfossil
analysis.
Kulon Progo had experienced tsunamis three times. The sediment founded at a
depth 99 cm-102 cm, 90cm -95 cm, and 78 cm – 85 cm. The characteristic of
paleotsunami deposits are very different from those above and below the deposit.
Based on granulometri analysis, the paleotsunami deposits have medium silt –
very coarse silt, poorly sorted-very poorly sorted, and bimodal-polymodal
grainsize distribution curve. Based on XRF analysis, the paleotsunami deposit
have Ca and Sr which been as marine characteristic more abundant than other
layers. Based on microfossil analysis, the paleotsunami deposits have 9 species
planktonic foraminifera and 5 species bentic foraminifera. Uvigerina peregrine
and Cibicides bradyi show that the tsunamis occurred from bathyal-abyssal and
mixed with outer neritic. Juvenil foraminifera indicate that tsunamis occurred
when the foraminifera still alive and the rupture shells of foraminifera also
indicate there were intensive clash because of the tsunamis. |
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