Seismicity, gravity anomalies and lithospheric structure of the Andaman arc, NE Indian Ocean

Radhakrishna, M.; Lasitha, S.; Mukhopadhyay, Manoj

doi:10.1016/j.tecto.2008.08.021

Cited by 49 publications

(18 citation statements)

References 55 publications

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“…Seismic activity is common along the Sunda trench and also within the Andaman Sea (Lay et al, 2005;Ornthammarath et al, 2011;Khan, 2012;NGDC, Global Significant Earthquake Database, 2012). Neotectonic activities have been reported from many structures in the Andaman Sea, such as the modern spreading centre (Kamesh Raju et al, 2004), the Sagaing Fault (Wang et al, 2011), the Andaman Arc (Radhakrishna et al, 2008), or the West Andaman Fault (Kamesh Raju et al, 2007). Ongoing tectonic activity is also documented in our data as faults reaching the surface.…”

Section: Final Trigger Mechanismsupporting

confidence: 74%

“…This value is relatively small compared to areas with recent extension, for example the Corinth Basin with a subsidence rate of 1 mm a −1 (Lykousis et al, 2007). In addition, subsidence rates tend to decrease after termination of rifting (Prosser, 1993). Therefore, subsidence and steepening may still play a role for slope stability but its influence became probably smaller since the onset of rifting that created the large mass flows described by Jha et al (2010).…”

Section: Tectonic Influence: Subsidence and Fault Controlled Failuresmentioning

confidence: 86%

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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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Section: Final Trigger Mechanismsupporting

confidence: 74%

Section: Tectonic Influence: Subsidence and Fault Controlled Failuresmentioning

confidence: 86%

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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“…Interpretation of gravity data suggests the crust beneath the Sewell and Alcock rises varies considerably in thickness, but may be in the order of 15-20 km in many places (Radhakrishna et al 2008). It can be argued that the relatively thick oceanic crust is due to the effects of magmatic underplating and volcanism.…”

Section: Alcock and Sewell Risesmentioning

confidence: 99%

Chapter 2 Active tectonics of Myanmar and the Andaman Sea

Sloan

Elliott

Searle

et al. 2017

Memoirs

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“…Seismicity and gravity anomalies reveal the downdip limit of the SZ in terms of upper plate mantle intersecting the oceanic subducting slab at a distance of ∼160-170 km from the trench axis and at a depth of ∼35 to 40 km for the Andaman region from 5 • to 9 • N (Radhakrishna, et al, 2008). Several studies were conducted in the area north of Simeulue island at 3 • N to 4 • N using MCS and wide-angle seismic studies Dessa et al, 2009;Klingelhoefer et al, 2010) as well as gravity and thermal modelling (Klingelhoefer et al, 2010).…”

Section: Off Sumatra From North To Southmentioning

confidence: 99%

Bathymetry of the Indonesian Sunda margin-relating morphological features of the upper plate slopes to the location and extent of the seismogenic zone

Krabbenhoeft

Weinrebe

Kopp

et al. 2010

Nat. Hazards Earth Syst. Sci.

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Seismicity, gravity anomalies and lithospheric structure of the Andaman arc, NE Indian Ocean

Cited by 49 publications

References 55 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

Chapter 2 Active tectonics of Myanmar and the Andaman Sea

Bathymetry of the Indonesian Sunda margin-relating morphological features of the upper plate slopes to the location and extent of the seismogenic zone

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