Updating Thai Reference Frame to ITRF2005 Using GPS: Diversion Between ITRF2000 and 2005 in Southeast Asia

Satirapod, Chalermchon; Simons, Wim; Panumastrakul, E.; Trisirisatayawong, Itthi

doi:10.1179/003962610x12747001420906

Cited by 7 publications

(3 citation statements)

References 6 publications

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“…However, the large difference of rotation rates between NNR-MORVEL56 and ITRF2008 indicates that alignment accuracy of ITRF2008 to NNR-MORVEL56 is not better than 2 mm/year . Finally ITRF2000 velocities are not fully compatible with either ITRF2005 and ITRF2008 as velocities in latitude component (at least within SE Asia) were found to differ up to a few mm/year (Satirapod et al 2011) and hence also affect the Euler pole and rotation rate estimations (e.g., Sundaland ITRF2000 and ITRF2005 results by Simons et al (2007) in Table 1). …”

Section: Previous Estimatesmentioning

confidence: 94%

Quantifying deformation in North Borneo with GPS

Mustafar

Simons

Tongkul

et al. 2017

J Geod

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The existence of intra-plate deformation of the Sundaland platelet along its eastern edge in North Borneo, South-East Asia, makes it an interesting area that still is relatively understudied. In addition, the motion of the coastal area of North-West Borneo is directed toward a frontal foldand-thrust belt and has been fueling a long debate on the possible geophysical sources behind it. At present this foldand-thrust belt is not generating significant seismic activity and may also not be entirely active due to a decreasing shelfal extension from south to north. Two sets of Global Positioning System (GPS) data have been used in this study; the first covering a time period from 1999 until 2004 (ending just before the Giant Sumatra-Andaman earthquake) to determine the continuous Sundaland tectonic plate motion, and the second from 2009 until 2011 to investigate the current deformations of North Borneo. Both absolute and relative positioning Moreover, station velocities and rotation rate tensors on the northern part of North Borneo suggest a clockwise (microblock) rotation. The first analysis of vertical displacements recorded by GPS in North-West Borneo points to low subsidence rates along the western coastal regions of Sabah and inconsistent trends between the Crocker and Trusmadi mountain ranges. These results have not been able to either confirm or reject the hypothesis that gravity sliding is the main driving force behind the local motions in North Borneo. The ongoing Sundaland-Philippine Sea plate convergence may also still play an active role in the present-day deformation (crustal shortening) in North Borneo and the possible clockwise rotation of the northern part of North Borneo as a micro-block. However, more observations need to be collected to determine if the northern part of North Borneo indeed is (slowly) moving independently.

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Section: Previous Estimatesmentioning

confidence: 94%

Quantifying deformation in North Borneo with GPS

Mustafar

Simons

Tongkul

et al. 2017

J Geod

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“…Co-seismic vertical displacements at these locations, determined from GPS processing (the difference between the first weekly averaged static solution after and before the earthquake), are PHKT (20.4 ± 14.5 mm), NTUS (−8.1 ± 5.2 mm), ARAU (12.1 ± 13.0 mm) and BNKK (−5.9 ± 9.2 mm). These co-seismic rates are derived from a data set, of which the horizontal component is analyzed and presented in Satirapod et al (2011). Both uplift and subsidence are present at PHKT and NTUS, contradicting the model that predicts only subsidence in the far field.…”

Section: Co-seismic Displacements Of the Sumatra-andaman Earthquakementioning

confidence: 97%

Sea level change in the Gulf of Thailand from GPS-corrected tide gauge data and multi-satellite altimetry

Trisirisatayawong

Naeije

Simons

et al. 2011

Global and Planetary Change

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“…The primary (first-order) network is extended from the zero-order network and comprised 19 GNSS stations with an interval of about 250km for each station. After the concurrence of the 9.2 Mw Sumatra-Andaman earthquake on the 26 th December of 2004, the network was readjusted and classified as class B by FGCC standard from 2005 (Satirapod et al 2009). For the secondary (second-order) network, there are 94 GNSS stations tied from the first-order network with a spacing interval of 50 to 100km and an accuracy of about one part per million (ppm).…”

Section: Gnss/leveling Datamentioning

confidence: 99%

The determination of Thailand Geoid Model 2017 (TGM2017) from airborne and terrestrial gravimetry

Dumrongchai¹,

Srimanee²,

Duangdee³

et al. 2021

Terr. Atmos. Ocean. Sci.

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The Royal Thai Survey Department and Chiangmai University developed the Thailand geoid model 2017 (TGM2017) with a 1x1 grid to support the transformation between Global Navigation satellite System (GNSS) ellipsoid heights and Kolak-1915 vertical datum orthometric heights.TGM2007 was based on Thailand gravimetric geoid model 2017 (THAIG17) and 299 GNSS ellipsoidal heights co-located with Kolak-1915 heights. All terrestrial gravity data used for geoid computation came from the new national gravity network, consisting of 87 absolute and 9,929 relative gravity stations at 10-25 km intervals, mostly along with existing roads. From 2016 to 2017, airborne gravity surveys were conducted at a 4,000m-flight altitude and 10km along-track spacing to acquire the gravity data over mountainous and inaccessible areas, including coastal and marine areas, at an estimated accuracy of 3.0 mGal. Long-wavelength geoid structure was controlled by the GOCE-EGM2008 combined model (GECO) and the Technical University of Denmark's global marine gravity model 2013 (DTU13). All gravity data were combined and downward, using leastsquares collocation with the residual terrain model reductions from a digital terrain elevation data level 2 (DTED2). THA17G was determined by multi-band spherical Fast Fourier Transform and converted to TGM2017 with the 38.2cm root-mean-square (rms) fit of 299 GNSS/leveling co-points and a mean offset of 37.0cm. This value represents the separation between Kolak-1915 and a global mean sea level. The evaluation of TGM2017 at 100 GNSS/leveling checkpoints shows the rms of 4.9cm, consequently leading to reliable orthometric heights at a 10-cm accuracy level or better.

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Updating Thai Reference Frame to ITRF2005 Using GPS: Diversion Between ITRF2000 and 2005 in Southeast Asia

Cited by 7 publications

References 6 publications

Quantifying deformation in North Borneo with GPS

Quantifying deformation in North Borneo with GPS

Sea level change in the Gulf of Thailand from GPS-corrected tide gauge data and multi-satellite altimetry

The determination of Thailand Geoid Model 2017 (TGM2017) from airborne and terrestrial gravimetry

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