AL
A.M. Lăpădat
info
Please Note
<p>This page displays the records of the person named above and is not linked to a unique person identifier. This record may need to be merged to a profile.</p>
1 records found
1
Preprint
(2025)
-
Alexandru M. Lăpădat, Heri Andreas, Wietske S. Brouwer, Simon A.N. van Diepen, Dhota Pradipta, Ramon F. Hanssen
Coastal megacities face compounding hazards from rising sea levels and land subsidence. Jakarta, one of the fastest-sinking megacities, already experiences recurrent flooding amplified by rapid land subsidence. Assessing and mitigating this hazard requires reliable estimates of three-dimensional ground motion over wide spatial and temporal scales in a well-defined geodetic reference frame and datum. Here we combine spaceborne InSAR and GNSS measurements to characterize Jakarta’s land deformation. We develop a datum-connection procedure that aligns multi-track InSAR line-of-sight datasets acquired between 2014 and 2025 to a common datum, enabling unbiased three-dimensional velocity decomposition. The resulting displacement field is then connected to the Sunda Plate Fixed Frame using GNSS observations, yielding a three-dimensional characterization of land deformation in a globally consistent reference frame. Our results show that Jakarta’s land motion is dominated by six main subsidence bowls, with vertical subsidence rates of up to −7.7 cm/yr and horizontal rates of up to 1.7 cm/yr, superimposed on slow regional subsidence of approximately −1.1 cm/yr across the metropolitan area. As these results rely on the availability of a single continuous GNSS station, we recommend the installation of dedicated geodetic ground-based infrastructure to ensure sustainable and rigorous long-term monitoring capabilities.
...
Coastal megacities face compounding hazards from rising sea levels and land subsidence. Jakarta, one of the fastest-sinking megacities, already experiences recurrent flooding amplified by rapid land subsidence. Assessing and mitigating this hazard requires reliable estimates of three-dimensional ground motion over wide spatial and temporal scales in a well-defined geodetic reference frame and datum. Here we combine spaceborne InSAR and GNSS measurements to characterize Jakarta’s land deformation. We develop a datum-connection procedure that aligns multi-track InSAR line-of-sight datasets acquired between 2014 and 2025 to a common datum, enabling unbiased three-dimensional velocity decomposition. The resulting displacement field is then connected to the Sunda Plate Fixed Frame using GNSS observations, yielding a three-dimensional characterization of land deformation in a globally consistent reference frame. Our results show that Jakarta’s land motion is dominated by six main subsidence bowls, with vertical subsidence rates of up to −7.7 cm/yr and horizontal rates of up to 1.7 cm/yr, superimposed on slow regional subsidence of approximately −1.1 cm/yr across the metropolitan area. As these results rely on the availability of a single continuous GNSS station, we recommend the installation of dedicated geodetic ground-based infrastructure to ensure sustainable and rigorous long-term monitoring capabilities.