PublicationS

Peer Reviewed Research Articles

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Geophysical Research Letters

Published: Jun 2024

Sea Ice Deformation Is Not Scale Invariant Over Length Scales Greater Than a Kilometer<em>Geophysical Research Letters</em> is an AGU journal publishing high-impact, innovative articles on major advances spanning all of the major geoscience disciplines.

Nature Communications

Published: April 2023

Sediment delivery to sustain the Ganges-Brahmaputra delta under climate change and anthropogenic impacts - Nature CommunicationsThe potential for enhanced sediment delivery to the Ganges-Brahmaputra delta exists, but it alone is insufficient to sustain the system. The delta may be resilient to climate change, but only in the absence of dam construction and water diversions.

Journal of Geophysical Research

Published: April 2023

New GNSS and Geological Data From the Indo‐Burman Subduction Zone Indicate Active Convergence on Both a Locked Megathrust and the Kabaw Fault<em>Journal of Geophysical Research: Solid Earth</em> is a premier AGU geophysics journal, publishing research articles from across the Earth sciences that significantly advance the field.

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Earth Science Review

Published: Jan 2022

Synthesis of the distribution of subsidence of the lower Ganges-Brahmaputra Delta, BangladeshDeltas, the low-lying land at river mouths, are sensitive to the delicate balance between sea level rise, land subsidence and sedimentation. Banglades…

Journal of Geodesy

Published: May 2021

VLBI measurement of the vector baseline between geodetic antennas at Kokee Park Geophysical Observatory, Hawaii - Journal of GeodesyWe measured the components of the 31-m-long vector between the two very-long-baseline interferometry (VLBI) antennas at the Kokee Park Geophysical Observatory (KPGO), Hawaii, with approximately 1 mm precision using phase delay observables from dedicated VLBI observations in 2016 and 2018. The two KPGO antennas are the 20 m legacy VLBI antenna and the 12 m VLBI Global Observing System (VGOS) antenna. Independent estimates of the vector between the two antennas were obtained by the National Geodetic Survey (NGS) using standard optical surveys in 2015 and 2018. The uncertainties of the latter survey were 0.3 and 0.7 mm in the horizontal and vertical components of the baseline, respectively. We applied corrections to the measured positions for the varying thermal deformation of the antennas on the different days of the VLBI and survey measurements, which can amount to 1 mm, bringing all results to a common reference temperature. The difference between the VLBI and survey results are 0.2 ± 0.4 mm, −1.3 ± 0.4 mm, and 0.8 ± 0.8 mm in the East, North, and Up topocentric components, respectively. We also estimate that the Up component of the baseline may suffer from systematic errors due to gravitational deformation and uncalibrated instrumental delay variations at the 20 m antenna that may reach ± 10 and −2 mm, respectively, resulting in an accuracy uncertainty on the order of 10 mm for the relative heights of the antennas. Furthermore, possible tilting of the 12 m antenna increases the uncertainties in the differences in the horizontal components to 1.0 mm. These results bring into focus the importance of (1) correcting to a common reference temperature the measurements of the reference points of all geodetic instruments within a site, (2) obtaining measurements of the gravitational deformation of all antennas, and (3) monitoring local motions of the geodetic instruments. These results have significant implications for the accuracy of global reference frames that require accurate local ties between geodetic instruments, such as the International Terrestrial Reference Frame (ITRF).

Tectonophysics

Published: Jul 2018

Microatolls document the 1762 and prior earthquakes along the southeast coast of BangladeshIn order to understand the seismic hazard associated with the Sunda megathrust along SE Bangladesh, it is necessary to document geologic evidence for …

Nature Geoscience

Published: Jul 2016

Locked and loading megathrust linked to active subduction beneath the Indo-Burman RangesIt is unclear whether subduction is still active beneath the Indo-Burman mountain range. Analyses of GPS measurements from this region reveal a locked megathrust fault, implying that subduction is active and could generate a large earthquake.

Nature Climate Change

Published: Jan 2015

Flood risk of natural and embanked landscapes on the Ganges–Brahmaputra tidal delta plainControlled embankment breaches could reduce flood risk for the Ganges–Brahmaputra tidal delta plain as sea level rises.

Fire Journal

Published: Jul 2019

High Risk of Post-Earthquake Fire Hazard in Dhaka, BangladeshAccording to a recent survey conducted by the Fire Service and Civil Defense in Dhaka, Bangladesh, more than 400 hospitals and clinics are facing a dreadful risk of fire hazard [...]

Groundwater for Sustainable Development

Published: Dec 2019

Assessment of Bangladesh groundwater for drinking and irrigation using weighted overlay analysisA weighted overlay analysis was conducted to calculate Water Quality Index (WQI) for drinking water using WHO and Bangladesh drinking water standards …

Journal of Hydrogeology

Published: Aug 2016

Vulnerability of low-arsenic aquifers to municipal pumping in BangladeshSandy aquifers deposited >12,000years ago, some as shallow as 30m, have provided a reliable supply of low-arsenic (As) drinking water in rural Banglad…

Geomorphology

Published: Dec 2014

Late Quaternary sedimentary record and Holocene channel avulsions of the Jamuna and Old Brahmaputra River valleys in the upper Bengal delta plainThe first Holocene stratigraphic record of river-channel occupation and switching between the Brahmaputra–Jamuna and Old Brahmaputra paleovalleys is p…

Coastal and Shelf Science

Published: Oct 2013

Monsoon sedimentation on the ‘abandoned’ tide-influenced Ganges–Brahmaputra delta plainAnnual sediment delivery by the Ganges and Brahmaputra rivers to the Bengal margin has kept pace with sea level rise since the mid Holocene, sustainin…

Selected Conference Papers and Abstracts

2016 AGU FALL MEETING

Uplifted Terraces along the Southeastern Coast of Bangladesh Reveal the Extent of 1762 Earthquake Surface Deformation and Potentially Document Prior Earthquakes To better understand geohazards for Bangladesh, the surface expression of the 1...

Modern Sedimentation along the SE Bangladesh Coast Reveal Surprisingly Low Accumulation Rates Recent sediments recovered along the SE coast of Bangladesh, from Teknaf to Cox...

Complex Channel Avulsion in the Meghna River Foodplain During the Mid to Late Holocene: The Potential Effect of Tectonic and Co-Seismic Uplift Channel migrations and river avulsions in deltaic river systems are mainly driv...

Flexure from a superposition of sedimentary and structural loads: the Ganges-Brahamaputra Delta, the IndoBurma accretionary prism and the Shillong Massif The Bengal Basin is the outcome of the superposition of the heavily-sedimented ...

Interseismic deformation at the leading edge of obliquely converging Burmese plate in densely populated Bangladesh. Densely populated Bangladesh sits at the juncture of 3-tectonic plates, India t...

Tectonics of the IndoBurma Oblique Subduction Zone The Ganges-Brahmaputra Delta (GBD) is obliquely colliding with the IndoBurma su...

2015 AGU FALL MEETING

Submergence and Uplift Associated to Paleoearthquakes in the Northern Sunda Subduction System: Implications for Future Earthquakes. Recent studies documented that the northern part of the Sunda subduction zone r...

Embracing Non-Stationarity – Hysteresis and Coherence in the Ganges-Brahmaputra Source-to-Sink System and Its Imprint on the Stratigraphic Record. The transport and deposition of Himalayan sediment since the last lowstand has ...

Measurements of the Balance of Subsidence and Sedimentation in the Coastal Zone of Bangladesh In the face of rising sea levels, the balance of land subsidence, sea level ris...

Evidence for the 1762 Tsunamigenic Earthquake in an Extremely Sedimented Segment of the Sunda Subduction/Collision Boundary, SE Bangladesh After the catastrophic 2004 Sumatra earthquake and tsunami, attention focussed ...