Combining Estimates of Tectonic Plate Rotations:

Earthquake in Assam and north Bengal in IndiaOn April 28, 2021, a 6.4 Richter scale earthquake affected the Sonitpur district of Assam, the tremors of which were felt in north Bengal and other parts of North-East India, as reported by the National Centre for Seismology1. Six more tremors followed the first shake 2. There were reports of widespread damage to buildings and other structures from across Assam, mostly in the central and western towns of Tezpur, Nagaon, Guwahati, Mangaldoi, Dhekiajuli, and Morigaon3. Again on May 3rd, 2021, an earthquake was felt in the Sonitpur district of Assam with a 3.7 magnitude on the Richter scale4. Assam disaster management authority reported that 10 people from 4 districts suffered physical injuries since the first attack on April 28, 2021, and some more time will be needed to know about the actual amount of damage that had taken place5. According to the National Centre for Seismology, the area affected by the earthquake is seismically very active and falls in the highest seismic hazard zone where the Indian tectonic plate subducts with the Eurasian plate because of which there are high chances of future quakes as well6.

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Investigation of Changes of the Kinematic Parameters of Antarctic Tectonic Plate Using Data Observations of Permanent GNSS Stations

Reports on Geodesy and Geoinformatics ◽

10.1515/rgg-2017-0010 ◽

2017 ◽

Vol 103 (1) ◽

pp. 119-135 ◽

Cited By ~ 1

Author(s):

Kornylii Tretyak ◽

Al-Alusi Forat ◽

Yurii Holubinka

Keyword(s):

Angular Velocity ◽

Kinematic Parameters ◽

Antarctic Region ◽

Tectonic Plate ◽

Euler Pole ◽

The Mean ◽

Using Data ◽

Gnss Permanent Stations ◽

The Antarctic

Abstract The paper describes a modified algorithm of determination of the Euler pole coordinates and angular velocity of the tectonic plate, considering the continuous and uneven distribution of daily measurements of GNSS permanent stations. Using developed algorithm were determined the mean position of Euler pole and angular velocity of Antarctic tectonic plate and their annual changes. As the input data, we used the results of observations, collected on 28 permanent stations of the Antarctic region, within the period from 1996 to 2014.

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Analysis of Sangihe Islands Movements derived from Recent GPS Observation

JGISE Journal of Geospatial Information Science and Engineering ◽

10.22146/jgise.51146 ◽

2019 ◽

Vol 2 (2) ◽

Author(s):

Krishna Fitranto Nugroho

Keyword(s):

The Philippines ◽

Border Region ◽

Movement Speed ◽

Deformation Analysis ◽

Normal Strain ◽

Vertical Deformation ◽

Horizontal Deformation ◽

Tectonic Plate ◽

Monitoring Point ◽

Plate Movement

Sangihe Islands is one of the districts located in the border region of the Republic of Indonesia precisely located in North Sulawesi Province which borders with the Philippines. Sangihe subduction zone is a subduction between the Sangihe plate and the Maluku sea plate. (Di Leo, et al., 2012). This situation causes the Sangihe Islands region to be very prone to earthquake and others disasters, so mitigation efforts are needed to minimize casualties and losses in other material forms. One of these efforts is mapping the potential of earthquakes through Geodynamic studies which are represented at the point of deformation control. This study is using four times GNSS observations epoch 2015, 2016, 2017 and 2018 tied to ITRF 2014. The data used for 3D deformation analysis with the multiepoch method to calculate the movement speed of the Sangihe plate and simultaneous tectonic plate strain observation. The results of this study are the coordinates and accuracy values of monitoring point also the plate movement speed and annual tectonic plate strain values. The movement speed of the Sangihe plate is SGH1 point is having horizontal deformation of 9.88 mm / year to the southeast and vertical deformation descend by 58.66 mm/year. SGH3 point is having horizontal deformation of 12.74 mm/year to the southeast and vertical deformation descend by 18.51 mm/year. SGH4 point is having horizontal deformation of 19.04 mm/year to the southeast and vertical deformation descend by 5.27 mm/ year. This research also proves the hypothesis of a change in the volume of the Sangihe Islands tectonic plate based on the values of normal strain parameters and shear strain in the fraction of 10-6 to 10-4 strains.

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Hotspot swells and the lifespan of volcanic ocean islands

Science Advances ◽

10.1126/sciadv.aaw6906 ◽

2020 ◽

Vol 6 (1) ◽

pp. eaaw6906 ◽

Cited By ~ 3

Author(s):

Kimberly L. Huppert ◽

J. Taylor Perron ◽

Leigh H. Royden

Keyword(s):

Residence Time ◽

Plate Motion ◽

Tectonic Plate ◽

Mantle Sources ◽

Volcanic Islands ◽

Ocean Islands

Volcanic ocean islands generally form on swells—seafloor that is shallower than expected for its age over areas hundreds to more than a thousand kilometers wide—and ultimately subside to form atolls and guyots (flat-topped seamounts). The mechanisms of island drowning remain enigmatic, however, and the subaerial lifespan of volcanic islands varies widely. We examine swell bathymetry and island drowning at 14 hotspots and find a correspondence between island lifespan and residence time atop swell bathymetry, implying that islands drown as tectonic plate motion transports them past mantle sources of swell uplift. This correspondence argues strongly for dynamic uplift of the lithosphere at ocean hotspots. Our results also explain global variations in island lifespan, which influence island topography, biodiversity, and climate.

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Tectonic Plate Theory

Introduction to Earth Sciences ◽

10.1142/9789813148437_0004 ◽

2017 ◽

pp. 133-169

Keyword(s):

Plate Theory ◽

Tectonic Plate

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