Active Convergence of the India‐Burma‐Sunda Plates Revealed by a New Continuous GPS Network

Mallick, Rishav; Lindsey, E. O.; Feng, Lujia; Hubbard, Judith; Banerjee, Paramesh; Hill, Emma M.

doi:10.1029/2018jb016480

Cited by 72 publications

(138 citation statements)

References 56 publications

Supporting

Mentioning

131

Contrasting

Order By: Relevance

“…We propose that the scatter in arc perpendicular motion across the detachment leads to ambiguity whether the BMT is either locked or creeping in aseismic manner. This observation differs with the results of Steckler et al (2016) and Mallick et al (2019) that the subduction between India and Sunda is active in the frontal part, which makes the region highly vulnerable for seismic activity. Moreover, the rate of subduction is significantly lower in our analysis which correspondingly brings down the associated seismic hazard in this region.…”

Section: 1029/2019tc006034contrasting

confidence: 99%

“…In fact, high-resolution seismic and multibeam survey profiles from the offshore of Myanmar do not support active accretion in the sedimentary wedge, except the presence of some massive landslides along the Myanmar coastline, suggesting faster rate of uplift of the Arakan Range (Rangin, 2019). Interestingly, this arc normal motion is significantly lower than the motion estimated by previous studies (Mallick et al, 2019;Steckler et al, 2016).…”

Section: Crustal Deformation and Strain Accumulation Across The Ibacontrasting

confidence: 73%

See 1 more Smart Citation

India‐Sunda Plate Motion, Crustal Deformation, and Seismic Hazard in the Indo‐Burmese Arc

et al. 2020

View full text Add to dashboard Cite

Plate motion along the Indo‐Burmese Arc (IBA), strain accommodation in the Indo‐Burmese wedge, status of active convergence and seismic vulnerability in the outer wedge, is a matter of concern due to the large population density in northeast India, Bangladesh, and Myanmar. In the present study, we have constrained the India‐Sunda plate motion by estimating the Euler pole using updated GPS observations from the region. Our estimated India‐Sunda relative plate motion at a point on the blind megathrust (24°N and 90°E) in Bangladesh constrains India‐Sunda relative motion at ~37 mm/year oriented along N11°E. This motion is partitioned among three major active units, namely, the Sagaing Fault (~18 mm/year), Churachandpur‐Mao Fault (~17 mm/year), and the blind megathrust (~7 mm/year), from west to east of the IBA, respectively. Our estimate of convergence across the blind megathrust is significantly lower than that estimated earlier. Due to large scatter in the data close to the updip edge of the blind megathrust, it is not certain whether it is accommodated through shallow creep or in stick‐slip manner, thus leading to uncertainty in the seismic hazard in this densely populated region.

show abstract

Section: 1029/2019tc006034contrasting

confidence: 99%

Section: Crustal Deformation and Strain Accumulation Across The Ibacontrasting

confidence: 73%

India‐Sunda Plate Motion, Crustal Deformation, and Seismic Hazard in the Indo‐Burmese Arc

et al. 2020

View full text Add to dashboard Cite

show abstract

“…In the CB, the newly discovered YUF and KF are able to accommodate surplus strike‐slip deformation along the N‐S direction not taken up by the Sagaing Fault. The CB would not be treated as a rigid block in future geodetic analyses (Mallick et al, 2019). Overall, the strike‐slip deformation dominates to the east of the KBF, while the shortening is mainly confined to the west of the KBF.…”

Section: Discussionmentioning

confidence: 99%

“…Furthermore, the investigations were hampered by no obvious tectonic landform due to sedimentation and/or rapid erosion. Steckler et al, 2016;Searle et al, 2017;Mallick et al, 2019;Wang et al, 2019). The tectonic units are delimited by different colors.…”

Section: Citationmentioning

confidence: 99%

Insight Into Major Active Faults in Central Myanmar and the Related Geodynamic Sources

Mon

Gong

Wen

et al. 2020

Geophysical Research Letters

View full text Add to dashboard Cite

Myanmar, one of the most active tectonic regions in the world, endures the risk of destructive earthquakes. Based on seismic data recorded at the recently deployed dense array of the China-Myanmar Geophysical Survey in the Myanmar Orogen (CMGSMO), we detect 854 and locate 599 shallow earthquakes with high precision and determine the focal mechanisms of 40 earthquakes. We identify two NW-SE trending fault zones accommodating dextral strike-slip earthquakes beneath the Central Basin, indicating potential seismic risk in the region. We also recognize a nearly N-S trending seismic zone in the overlying Indo-Burma Ranges (IBR) crust near the Kabaw Fault (KBF). The earthquakes within this seismic zone mostly show thrusting focal mechanisms. Our results suggest that strike-slip deformation dominates to the east of the KBF, while shortening is mainly confined to the west of the KBF in Central Myanmar.Plain Language Summary Myanmar in Southeast Asia suffers from disasters resulting from destructive earthquakes. However, the present knowledge on their causative faults is limited due to the deployment of few seismic observation stations in Myanmar. We deployed a seismic observation network containing 71 stations for 1.5 years and tried to identify unknown causative faults and their characteristics by studying the small earthquakes there. Our results suggest that larger areas than previously expected in Myanmar may encounter significant seismic hazards. More attention to mitigating hazards should be paid to the Central Basin and western mountain areas, where densely populated cities are located.

show abstract

“…The smoothing factor α and weight factor γ can be found by numerically finding the minimum of the ABIC function (Fukahata et al, 2004;Funning et al, 2014;Mallick et al, 2019) as follows:…”

Section: Glacier Mass Balance Inversionmentioning

confidence: 99%

Contemporary Mountain‐Building of the Tianshan and its Relevance to Geodynamics Constrained by Integrating GPS and GRACE Measurements

Pan

Wang

et al. 2019

JGR Solid Earth

View full text Add to dashboard Cite

The present-day deformation of the Tianshan Mountain range is largely resulting from the collision between India and the Eurasian plate, but the mechanism causing its uplift remains controversial. In this study, we present the contemporary tectonic and geodynamic processes resulting in the growth of the Tianshan Mountain range as revealed by integrating Global Positioning System (GPS) and Gravity Recovery and Climate Experiment (GRACE) measurements during 2010-2016. The average ground uplift rate is 0.72 ± 0.12 mm/year, of which 0.39 mm/year is attributed to elastic effects of glacier melting. The residual average tectonic uplift rate of 0.33 ± 0.12 mm/year closely matches the crustal thickening rate (0.33 ± 0.03 mm/year), indicating that horizontal compression plays an essential role in Tianshan orogeny. We also find the Lake Issyk-Kul region is converging and subsiding, which can be explained by a regional crust folding model. The interaction of adjacent rigid blocks in the Tianshan and surrounding areas is also manifested by the crustal shortening derived from GPS horizontal velocities. This study provides new geodetic results and a new model in current orogenic movement in the Tianshan Mountain range and highlights its complexity.

show abstract

Active Convergence of the India‐Burma‐Sunda Plates Revealed by a New Continuous GPS Network

Cited by 72 publications

References 56 publications

India‐Sunda Plate Motion, Crustal Deformation, and Seismic Hazard in the Indo‐Burmese Arc

India‐Sunda Plate Motion, Crustal Deformation, and Seismic Hazard in the Indo‐Burmese Arc

Insight Into Major Active Faults in Central Myanmar and the Related Geodynamic Sources

Contemporary Mountain‐Building of the Tianshan and its Relevance to Geodynamics Constrained by Integrating GPS and GRACE Measurements

Contact Info

Product

Resources

About