Current Land Deformation Monitoring of Sidoarjo Mudflow (LUSI) Using Geodetic GPS and GAMIT/GLOBK

Agustawijaya, Ausa Ramadhan (2023) Current Land Deformation Monitoring of Sidoarjo Mudflow (LUSI) Using Geodetic GPS and GAMIT/GLOBK. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Indonesia's geographic location and high tectonic activity make it prone to frequent natural events. One notable occurrence is the Sidoarjo mudflow in Sidoarjo Regency, East Java, triggered by the release of hot mud and gas from the PT. Lapindo Brantas drilling site. To investigate this phenomenon, GPS devices were deployed to collect data from the mudflow embankment and nearby areas. Data Observation employing both static and differential methods up until 2 hours. The GAMIT/GLOBK software was utilized to estimate three-dimensional positions and process daily observations to obtain average station coordinates. Before the reduction of the Sunda Block, horizontal displacements showed a southeastward trend, ranging from 25.60 mm/yr to 28.95 mm/yr between 2021 and 2022. Post-reduction, the northing shift speed ranged from -9.33 mm/yr to -9.70 mm/yr, while the easting shift speed ranged from 22.94 mm/yr to 23.18 mm/yr. Vertical displacements indicated a subsidence velocity of -12.53 mm/yr at the CORS station and an uplift velocity of 15.52 mm/yr. The CLMG station exhibited the highest subsidence rate with a standard deviation of 0.49 mm/yr, while the CPAS station experienced an uplift of 15.52 mm/yr with the same standard deviation. The CMJT station displayed the smallest displacements at a rate of 0.49 mm/yr. Campaign observations revealed varying velocities and directions. The PSPD station demonstrated maximum subsidence at -423.52 mm/yr, while the PTGG station exhibited an uplift of 30.06 mm/yr. Compression was observed along the Kendeng Faults based on the strain model derived from strain interpolation, it is expected did not affected Sidoarjo mudflow significantly.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Mudflow, Embankment, GPS, Displacements.
Subjects:	G Geography. Anthropology. Recreation > G Geography (General) > G109.5 Global Positioning System G Geography. Anthropology. Recreation > GB Physical geography > GB1399.9 Floods G Geography. Anthropology. Recreation > GE Environmental Sciences
Divisions:	Faculty of Civil, Planning, and Geo Engineering (CIVPLAN) > Geomatics Engineering > 29202-(S1) Undergraduate Thesis
Depositing User:	Ausa Ramadhan Agustawijaya
Date Deposited:	21 Aug 2023 04:16
Last Modified:	21 Aug 2023 04:16
URI:	http://repository.its.ac.id/id/eprint/102212

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