TEXTURAL CHARACTERISTICS OF TSUNAMIITE: STUDY ON RECENT TSUNAMI DEPOSIT AT PANGANDARAN COAST, CIAMIS AND PARANGENDOG COAST, YOGYAKARTA
PROCEEDINGS JOINT CONVENTION BALI 2007
The 32nd HAGI, The 36th IAGI, and The 29th IATMI Annual Conference and Exhibition
TEXTURAL CHARACTERISTICS OF TSUNAMIITE:
STUDY ON RECENT TSUNAMI DEPOSIT AT PANGANDARAN COAST,
CIAMIS AND PARANGENDOG COAST, YOGYAKARTA
Hendra Amijaya, Ngisomuddin
Department of Geological Engineering, Gadjah Mada University
Jalan Grafika 2, Yogyakarta 55281
ABSTRACT
July 17, 2006 tsunami which occurred in Indian Ocean had swept most of the south coast of Java, especially at Pangandaran area, West Java. The tsunami wave transported and deposited sediment known as tsunamiite. This research was done to characterize the textural appearance of tsunami sediment taken from Pangandaran Beach, Ciamis and Parangendog Beach, Yogyakarta. At least three different textural characteristics have been recognized on the tsunami sediment deposit. First type is on the tsunamiite found at West Pangandaran Beach, which is darker than the older beach sediment and separated by erosional surface. The sedimentary structures are parallel lamination and current ripple. The grains have no fining trend in vertical as well as lateral direction. Whereas the second type is found at East Pangandaran Beach, which is brighter than the older beach sediment and also separated by erosional surface. The sedimentary structures are cross lamination on the lower layer, parallel lamination on the middle layer and massif on the upper layer. The grains have no fining trend in vertical and lateral direction. Other typical characteristic of tsunamiite is found at Parangendog Beach. The tsunamiite is deposited above soil layer and characterized by eroded soil surface and by the occurrence of soil clumps in the tsunami deposit. The sedimentary structures are parallel lamination on the lower layer and current ripple on the upper layer. No fining upward trend is found. The textural characteristics of tsunamiite are locally typical. They depend on the local physical characteristics of the coast.
Keywords: tsunamiite, sediment, Pangandaran
The 32nd HAGI, The 36th IAGI, and The 29th IATMI Annual Conference and Exhibition
TEXTURAL CHARACTERISTICS OF TSUNAMIITE:
STUDY ON RECENT TSUNAMI DEPOSIT AT PANGANDARAN COAST,
CIAMIS AND PARANGENDOG COAST, YOGYAKARTA
Hendra Amijaya, Ngisomuddin
Department of Geological Engineering, Gadjah Mada University
Jalan Grafika 2, Yogyakarta 55281
ABSTRACT
July 17, 2006 tsunami which occurred in Indian Ocean had swept most of the south coast of Java, especially at Pangandaran area, West Java. The tsunami wave transported and deposited sediment known as tsunamiite. This research was done to characterize the textural appearance of tsunami sediment taken from Pangandaran Beach, Ciamis and Parangendog Beach, Yogyakarta. At least three different textural characteristics have been recognized on the tsunami sediment deposit. First type is on the tsunamiite found at West Pangandaran Beach, which is darker than the older beach sediment and separated by erosional surface. The sedimentary structures are parallel lamination and current ripple. The grains have no fining trend in vertical as well as lateral direction. Whereas the second type is found at East Pangandaran Beach, which is brighter than the older beach sediment and also separated by erosional surface. The sedimentary structures are cross lamination on the lower layer, parallel lamination on the middle layer and massif on the upper layer. The grains have no fining trend in vertical and lateral direction. Other typical characteristic of tsunamiite is found at Parangendog Beach. The tsunamiite is deposited above soil layer and characterized by eroded soil surface and by the occurrence of soil clumps in the tsunami deposit. The sedimentary structures are parallel lamination on the lower layer and current ripple on the upper layer. No fining upward trend is found. The textural characteristics of tsunamiite are locally typical. They depend on the local physical characteristics of the coast.
Keywords: tsunamiite, sediment, Pangandaran
Labels: Geology
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