Present-day crustal deformation revealed active tectonics in Yogyakarta, Indonesia inferred from GPS observations

Widjajanti, Nurrohmat; Pratama, Cecep; Parseno,; Sunantyo, Tarsisius Aris; Heliani, Leni Sophia; Ma'ruf, Bilal; Atunggal, Dedi; Lestari, Dwi; Ulinnuha, Hilmiyati; Pinasti, Arinda; Ummi, Riska Fajrul

doi:10.1016/j.geog.2020.02.001

Cited by 18 publications

(5 citation statements)

References 19 publications

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“…At the same time, ω is the angular velocity of the rotation pole and radius of the earth. Based on the 𝑋, 𝑌, and 𝑍 angular rotation vectors, the value of 𝜑, 𝜆, and ω can be estimated with equations (4), (5), and (6) by [6].…”

Section: Sunda Block Reference Framementioning

confidence: 99%

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Estimation of Slip Rate and the Opak Fault Geometry Based on GNSS Measurement

Adam

Widjajanti

Pratama

2022

IOP Conf. Ser.: Earth Environ. Sci.

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GNSS observations are usually used in periodic deformation monitoring. The Opak fault, which was in the Special Region of Yogyakarta, became a concern after the 2006 earthquake. The horizontal velocity values of each observation station are needed to estimate the slip rate and locking depth values of the Opak fault. The magnitude of the velocity vector is computed by the linear least square method, then translated into the Sunda Block reference frame. The creep of fault assumption is used in analyzing the potential for the earthquake in the Opak fault region. The velocity is done by reducing the Sunda Block using the Euler pole method, and it produces a velocity vector value on the east component is -6.08 to 5.25 mm/year while the north component is -3.38 to 5.74 mm/year. Meanwhile, in the northern segment of the Opak fault, the estimated slip rate is around 3.5 to 10.5 mm/year, with the locking depth obtained of 1.1 to 8 km, while in the southern segment of the Opak fault, the estimated slip rate is 4 to 5.5 mm/year, with a locking depth obtained of 0.6 to 1.2 km. The creep of the fault effect is predominantly in the southern segment of the Opak fault. This case indicates that the potential for earthquake hazards is smaller in the south segment than in the north segment.

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Section: Sunda Block Reference Framementioning

confidence: 99%

“…In the last decade, the Opak fault became a single fault that identified as a significant active tectonic deformation. There is an indication that a new fault occurred in the northern part of the Opak fault [5]. Therefore, this study focuses on the estimation of locking depth in the north part of the Opak fault.…”

Section: Introductionmentioning

confidence: 99%

Estimation of Slip Rate and the Opak Fault Geometry Based on GNSS Measurement

Adam

Widjajanti

Pratama

2022

IOP Conf. Ser.: Earth Environ. Sci.

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“…The eruption of Mount Anak Krakatau was caused by active faults in the basement. Strain level analysis can identify tectonic and volcanic activity [1]. Undersea slope instability is widespread in Indonesia [2].…”

Section: Introductionmentioning

confidence: 99%

Indications of transtensional strike slip fault in the Mount Anak Krakatau based on earthquake focal mechanism data

Mahbub

Ragil²,

Qoyyibi³

2023

IOP Conf. Ser.: Earth Environ. Sci.

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Anak Krakatau volcano in the Sunda Strait was through pyroclastic materials landslide phenomenon that caused by a tsunami wave at the end of December 2018. Tsunami wave hit the west coast of Pandeglang and part of the coast of Lampung. Recent tectonic activity produces an epicenter around Anak Krakatau volcano, a shallow earthquake depth of 10 - 15 km below the surface. These data were collected by the interpretation of remote sensing DEM SRTM images, focal mechanism, bathymetry, and hillslope analysis. Quantitative analysis in determining the movement mechanism of strike slip faults and the damage zone as the trigger for landslides on the southwestern volcano sidewall. The main fault has N153°E / 74°E rake 9° is related to the surface of stress and strain results of synthetic and antithetic faults. It is suspected that the post-eruption caldera of Krakatau Volcano is the remaining surface openings in the 1883 while erupted. Knowledge of the causes of landslides to be prepared to anticipate broken infrastructure, victims, and tourism along the coast of Banten and Lampung.

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“…Some researchers propose that the fault structure responsible for the 2006 mainshock is located east of the Opak River [6,[8][9][10][11]. According to temporal geodetic observation conducted by [12], the fault mechanism is primarily dip-slip. There is also suspicion of the existence of other faults with a sinistral strike-slip mechanism in the southern part.…”

Section: Introductionmentioning

confidence: 99%

Analyzing Recent Seismic Activity of the Opak Fault System in Central Java, Indonesia, From 2009 to 2021

Ekarsti

2023

GEOMATE

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The shock was felt with an intensity of VI-VII MMI around Yogyakarta, Indonesia. The earthquake was presumably caused by the movement of the Opak Fault. Following the strong earthquake, seismic activity along the fault has remained high to this day. In order to explain the progression of seismic activity and understand the mechanism of the Opak fault, we conducted catalog relocation, focal mechanism inversion, and statistical analysis of the earthquake events from 2009-2021. The events were relocated using the Double Difference Method. To improve the accuracy of the focal mechanism inversion, we updated the 1-D velocity model from Crust 1.0 to a local velocity model. We inverted the mechanism of earthquakes with a magnitude of M≥3.0. The results indicate that the recent hypocenters are clustered in the southeastern part of the Opak Fault. This cluster is located within the rupture zone of the Mw6.4 2006 mainshock, providing further evidence that postearthquake deformation from 2006 is still ongoing and primarily involves left-lateral oblique-slip faulting. The mechanism results are consistent with the observable morphological contrast on the surface. Cross-section plots of seismicity and dip angle, perpendicular to the mainshock strike, reveal a flower structure pattern, indicating a complex mechanism. The fault system is believed to be in the interseismic period, supported by the low bvalue. The suspicion is further strengthened by an increase in microseismic activity and a decrease in M>3.0. This evidence suggests that the Opak Fault is currently experiencing strain accumulation.

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Present-day crustal deformation revealed active tectonics in Yogyakarta, Indonesia inferred from GPS observations

Cited by 18 publications

References 19 publications

Estimation of Slip Rate and the Opak Fault Geometry Based on GNSS Measurement

Estimation of Slip Rate and the Opak Fault Geometry Based on GNSS Measurement

Indications of transtensional strike slip fault in the Mount Anak Krakatau based on earthquake focal mechanism data

Analyzing Recent Seismic Activity of the Opak Fault System in Central Java, Indonesia, From 2009 to 2021

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