Morphology of the Andaman outer shelf and upper slope of the Thai exclusive economic zone

Jintasaeranee, Pachoenchoke; Weinrebe, Wilhelm; Klaucke, Ingo; Snidvongs, Anond; Flueh, Ernst R.

doi:10.1016/j.jseaes.2011.11.003

Cited by 5 publications

(5 citation statements)

References 36 publications

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“…The system uses a frequency of 50 kHz, 126 individual beams and a swath width of up to 153 • (Jintasaeranee et al, 2012). Resolution of the processed bathymetric grid is 50 m.…”

Section: Dataset and Methodsmentioning

confidence: 99%

“…Jintasaeranee et al (2012) identified possible slumping areas, though these landslides are considered to be too small for having triggered a significant tsunami in the recent past. Jintasaeranee et al (2012), however, did not investigate older slope failures. New seismic data were collected during the MASS III research cruise in January 2011.…”

Section: Introductionmentioning

confidence: 99%

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Submarine mass wasting and associated tsunami risk offshore western Thailand, Andaman Sea, Indian Ocean

Schwab

Krastel

Grün

et al. 2012

Nat. Hazards Earth Syst. Sci.

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Abstract. 2-D seismic data from the top and the western slope of Mergui Ridge in water depths between 300 and 2200 m off the Thai west coast have been investigated in order to identify mass transport deposits (MTDs) and evaluate the tsunamigenic potential of submarine landslides in this outer shelf area. Based on our newly collected data, 17 mass transport deposits have been identified. Minimum volumes of individual MTDs range between 0.3 km 3 and 14 km 3 . Landslide deposits have been identified in three different settings: (i) stacked MTDs within disturbed and faulted basin sediments at the transition of the East Andaman Basin to the Mergui Ridge; (ii) MTDs within a pile of drift sediments at the basin-ridge transition; and (iii) MTDs near the edge of/on top of Mergui Ridge in relatively shallow water depths (< 1000 m). Our data indicate that the Mergui Ridge slope area seems to have been generally unstable with repeated occurrence of slide events. We find that the most likely causes for slope instabilities may be the presence of unstable drift sediments, excess pore pressure, and active tectonics. Most MTDs are located in large water depths (> 1000 m) and/or comprise small volumes suggesting a small tsunami potential. Moreover, the recurrence rates of failure events seem to be low. Some MTDs with tsunami potential, however, have been identified on top of Mergui Ridge. Mass-wasting events that may occur in the future at similar locations may trigger tsunamis if they comprise sufficient volumes. Landslide tsunamis, emerging from slope failures in the working area and affecting western Thailand coastal areas therefore cannot be excluded, though the probability is very small compared to the probability of earthquake-triggered tsunamis, arising from the Sunda Trench.

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“…The system uses a frequency of 50 kHz, 126 individual beams and a swath width of up to 153 • (Jintasaeranee et al, 2012). Resolution of the processed bathymetric grid is 50 m.…”

Section: Dataset and Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Submarine mass wasting and associated tsunami risk offshore western Thailand, Andaman Sea, Indian Ocean

Schwab

Krastel

Grün

et al. 2012

Nat. Hazards Earth Syst. Sci.

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show abstract

“…We note from the multibeam bathymetry that there are three channels that all emerge from this zone and coalesce into a 400 m wide primary channel downslope (Figures and ). Such linear slope “chutes” have been associated with submarine landslides in many other locations [e.g., Twichell et al ., ; Tappin , ; Migeon et al ., ; Jintasaeraneea et al ., ; Dalla Valle et al ., ; Gales et al ., ; Laberg et al ., ]. These are the primary pathways that landslide materials moved downslope on the Valdez delta front; we conclude this from interpreting the combination of multibeam bathymetry and subbottom seismic reflection profiling.…”

Section: Observationsmentioning

confidence: 99%

Source and progression of a submarine landslide and tsunami: The 1964 Great Alaska earthquake at Valdez

et al. 2014

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Like many subduction zone earthquakes, the deadliest aspects of the 1964 M = 9.2 Alaska earthquake were the tsunamis it caused. The worst of these were generated by local submarine landslides induced by the earthquake. These caused high runups, engulfing several coastal towns in Prince William Sound. In this paper, we study one of these cases in detail, the Port Valdez submarine landslide and tsunami. We combine eyewitness reports, preserved film, and careful posttsunami surveys with new geophysical data to inform numerical models for landslide tsunami generation. We review the series of events as recorded at Valdez old town and then determine the corresponding subsurface events that led to the tsunami. We build digital elevation models of part of the pretsunami and posttsunami fjord-head delta. Comparing them reveals a~1500 m long region that receded 150 m to the east, which we interpret as the primary delta landslide source. Multibeam imagery and high-resolution seismic reflection data identify ã 400 m wide chute with hummocky deposits at its terminus, which may define the primary slide path. Using these elements we run hydrodynamic models of the landslide-driven tsunamis that match observations of current direction, maximum inundation, and wave height at Valdez old town. We speculate that failure conditions at the delta front may have been influenced by manmade changes in drainage patterns as well as the fast retreat of Valdez and other glaciers during the past century.

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“…Accordingly, the Andaman Sea is active basin it could be divided by the different of tectonic characteristics into three parts (Jintasaeranee et al, 2012); the southwestern part (active N-S fault systems), the western part (volcanic areas), and the eastern part (distinctly smooth flat areas). The southwestern part is dominated by N-S trending fault systems (Raju et al, 2004) as Fig.…”

Section: Geological Settingmentioning

confidence: 99%

“…The third part, the eastern and the southern margin of Andaman Sea are between by the Burmese Archipelago and the Sumatra Islands (Jintasaeranee et al, 2012).…”

Section: Geological Settingmentioning

confidence: 99%

Feeding ecology of priapiumfish neostethus lankesteri regan, 1916 in Sirinart Rajini mangrove ecosystem learning center and Pranburi river, Prachuap Khiri Khan province

Bunsomboonsakul

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The priapiumfish, Neostethus lankesteri is a dominant species of the Pranburi River ecosystem. It was hypothesized as a link between primary producer and higher consumer of the Pranburi River Estuary ecosystem, Prachuap Khiri Khan Province. However, the roles and utilization of N. lankesteri in the ecosystem have not been reported. In this study, I used gut content analysis and morpho-histology of the digestive tract and the gametogenesis to examine the habitat utilization of this fish. Thirty individuals of N. lankesteri were collected monthly by larval trawl from two sites: Pranburi River estuary and Sirinart Rajini Mangrove Ecosystem Learning Center (SRMELC), during Northeast Monsoon and Southwest Monsoon season. Based on the gut content of N. lankesteri, food items were categorized into four groups: diatoms, algae, dinoflagellates, and zooplankton. The index of relative importance, IRI showed that diatoms were a major component followed by zooplankton at Pranburi River estuary, whereas zooplankton was a major component followed by the diatoms at SRMELC during the two seasons. Moreover, Neostethus lankesteri has a superior mouth with canine teeth. The pharyngeal toothplates were numerous with canine-shaped. The intestine coefficient of N. lankerteri was 0.55. The results of the histology of the digestive tract in N. lankesteri showed that they were stomachless, which the intestine consisted of three regions: anterior intestine, middle intestine, and posterior intestine. Goblet cells were also observed among epitheliums and positively reacted to Periodic Acid Schiff staining method. The study of the gametogenesis of female N. lankesteri revealed that the mature ovary in these fish was an asynchronous development oocyte type which consisting of two phases: primary growth phase and secondary growth phase. Post-ovulatory phase was observed in the sampling periods as well. In male N. lankesteri, the mature testicular parenchyma was observed. The spermatogenetic stage was divided into three phases including spermatogonial, spermatocyte and spermiogenetic phases. Overall, based on gut content, morpho-histology of the digestive tract, and gametogenesis, I suggest that N. lankesteri is zooplankton feeder specialist (sensu lato) and utilized the Pranburi River estuary ecosystem for both feeding ground and spawning ground.

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Morphology of the Andaman outer shelf and upper slope of the Thai exclusive economic zone

Cited by 5 publications

References 36 publications

Submarine mass wasting and associated tsunami risk offshore western Thailand, Andaman Sea, Indian Ocean

Submarine mass wasting and associated tsunami risk offshore western Thailand, Andaman Sea, Indian Ocean

Source and progression of a submarine landslide and tsunami: The 1964 Great Alaska earthquake at Valdez

Feeding ecology of priapiumfish neostethus lankesteri regan, 1916 in Sirinart Rajini mangrove ecosystem learning center and Pranburi river, Prachuap Khiri Khan province

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