Earthquake occurrence processes in the Indo-Burmese wedge and Sagaing fault region

Kundu, Bhaskar; Gahalaut, Vineet K.

doi:10.1016/j.tecto.2011.12.031

Cited by 92 publications

(65 citation statements)

References 52 publications

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“…Thus, these earthquakes and the stress state do not support active subduction across the IBA which is also consistent with the relative motion of India-Sunda plates. In the Sagaing fault region, earthquakes occur through dextral strike slip motion along the N-S oriented plane and the stress state is consistent with the plate motion across the Sagaing fault (Kundu & Gahalaut 2012).…”

Section: Earthquakes In the Iba Regionmentioning

confidence: 64%

“…Under the accretionary wedge of the Indo-Burmese arc, majority of the earthquakes occur in the depth range of 30À60 km and define an eastward gently dipping seismicity trend surface that coincides with the Indian slab. The dip of the slab steepens in the east direction and earthquakes occur down to a depth of 150 km (Kundu & Gahalaut 2012), though the slab can be traced up to the 660 km discontinuity (Pesicek et al 2010). Frequency of earthquakes increases as the dip of the slab increases.…”

Section: Earthquakes In the Iba Regionmentioning

confidence: 99%

“…It consists of mainly three units, approximately E-W extending eastern Himalaya, which marks the collisional boundary between the underthursting Indian plate beneath the Eurasia plate, approximately N-S extending Indo-Burmese Arc (IBA), which extends further southward to join the Andaman Arc, and the eastern Himalayan syntaxis (EHS) which lies at the junction of the above two. Subduction surely occurs along the Andaman Arc, but whether it is still active in the IBA is debated (Kundu & Gahalaut 2012;Gahalaut et al 2013). The 4 January 2016 Manipur earthquake (Mw 6.7) occurred in the wedge part of the IBA, about 30 km west of Imphal with its epicentre at 24.85 N latitude and 93.55 E longitude (figure 1).…”

Section: Introductionmentioning

confidence: 99%

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The 4 January 2016 Manipur earthquake in the Indo-Burmese wedge, an intra-slab event

Gahalaut

Kundu

2016

Geomatics, Natural Hazards and Risk

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Earthquakes in the Indo-Burmese wedge occur due to India-Sunda plate motion. These earthquakes generally occur at depth between 25 and 150 km and define an eastward gently dipping seismicity trend surface that coincides with the Indian slab. Although this feature mimics the subduction zone, the relative motion of Indian plate predominantly towards north, earthquake focal mechanisms suggest that these earthquakes are of intra-slab type which occur on steep plane within the Indian plate. The relative motion between the India and Sunda plates is accommodated at the Churachandpur-Mao fault (CMF) and Sagaing Fault. The 4 January 2016 Manipur earthquake (M 6.7) is one such earthquake which occurred 20 km west of the CMF at »60 km depth. Fortunately, this earthquake occurred in a very sparse population region with very traditional wooden frame houses and hence, the damage caused by the earthquake in the source region was very minimal. However, in the neighbouring Imphal valley, it caused some damage to the buildings and loss of eight lives. The damage in Imphal valley due to this and historical earthquakes in the region emphasizes the role of local site effect in the Imphal valley.

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Section: Earthquakes In the Iba Regionmentioning

confidence: 64%

Section: Earthquakes In the Iba Regionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The 4 January 2016 Manipur earthquake in the Indo-Burmese wedge, an intra-slab event

Gahalaut

Kundu

2016

Geomatics, Natural Hazards and Risk

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“…In addition, the Sagaing fault zone striking north-south in central Myanmar, zone C, and the Sumatra fault zone striking northwestsoutheast in Sumatra Island, zone E, are the major inland strike-slip faults in this region. According to Brown and Leicester (1933), an M w -8.0 earthquake (number 2 in Figure 1) in zone C was created by the Sagaing fault zone on May 23, 1912, as were a number of other major earthquakes (Kundu and Gahalaut 2012). Zone D, the Andaman Basin off the coast of Andaman Sea, is occupied by transform fault systems consisting of the Andaman transform zone and Central Andaman rift in addition to the West Andaman and Seuliman faults (Cattin et al 2009).…”

Section: Seismic Sourcesmentioning

confidence: 99%

“…Zone D, the Andaman Basin off the coast of Andaman Sea, is occupied by transform fault systems consisting of the Andaman transform zone and Central Andaman rift in addition to the West Andaman and Seuliman faults (Cattin et al 2009). Tectonically, zones C, D, and E include the plate boundary between the Burma and Sunda plates (Kundu and Gahalaut 2012).…”

Section: Seismic Sourcesmentioning

confidence: 99%

Earthquake frequency-magnitude distribution and fractal dimension in mainland Southeast Asia

Pailoplee

Choowong

2014

Earth, Planets and Space

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The 2004 Sumatra and 2011 Tohoku earthquakes highlighted the need for a more accurate understanding of earthquake characteristics in both regions. In this study, both the a and b values of the frequency-magnitude distribution (FMD) and the fractal dimension (D C ) were investigated simultaneously from 13 seismic source zones recognized in mainland Southeast Asia (MLSEA). By using the completeness earthquake dataset, the calculated values of b and D C were found to imply variations in seismotectonic stress. The relationships of D C -b and D C -(a/b) were investigated to categorize the level of earthquake hazards of individual seismic source zones, where the calibration curves illustrate a negative correlation between the D C and b values (D c = 2.80 − 1.22b) and a positive correlation between the D C and a/b ratios (D c = 0.27(a/b) − 0.01) with similar regression coefficients (R 2 = 0.65 to 0.68) for both regressions. According to the obtained relationships, the Hsenwi-Nanting and Red River fault zones revealed low-stress accumulations. Conversely, the Sumatra-Andaman interplate and intraslab, the Andaman Basin, and the Sumatra fault zone were defined as high-tectonic stress regions that may pose risks of generating large earthquakes in the future.

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Coulomb stress transfer and accumulation on the Sagaing Fault, Myanmar, over the past 110 years and its implications for seismic hazard

Xiong

Shan

Zhou

et al. 2017

Geophysical Research Letters

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Myanmar is drawing rapidly increasing attention from the world for its seismic hazard. The Sagaing Fault (SF), an active right‐lateral strike‐slip fault passing through Myanmar, has been being the source of serious seismic damage of the country. Thus, awareness of seismic hazard assessment of this region is of pivotal significance by taking into account the interaction and migration of earthquakes with respect to time and space. We investigated a seismic series comprising10 earthquakes with M > 6.5 that occurred along the SF since 1906. The Coulomb failure stress modeling exhibits significant interactions among the earthquakes. After the 1906 earthquake, eight out of nine earthquakes occurred in the positively stress‐enhanced zone of the preceding earthquakes, verifying that the hypothesis of earthquake triggering is applicable on the SF. Moreover, we identified three visible positively stressed earthquake gaps on the central and southern SF, on which seismic hazard is increased.

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Earthquake occurrence processes in the Indo-Burmese wedge and Sagaing fault region

Cited by 92 publications

References 52 publications

The 4 January 2016 Manipur earthquake in the Indo-Burmese wedge, an intra-slab event

The 4 January 2016 Manipur earthquake in the Indo-Burmese wedge, an intra-slab event

Earthquake frequency-magnitude distribution and fractal dimension in mainland Southeast Asia

Coulomb stress transfer and accumulation on the Sagaing Fault, Myanmar, over the past 110 years and its implications for seismic hazard

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