The Quantifying Crustal Deformation Caused by the Cianjur Tectonic Earthquakes Magnitude 5.6 through InSAR and GNSS Technology
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Abstract
Indonesia, an archipelagic country situated within the volatile Ring of Fire and the convergence of multiple tectonic plates, frequently experiences seismic activity. These earthquakes have led to alterations in the Earth's surface layers and even damage to the land. The Cianjur earthquake, which occurred on November 21, 2022, was a shallow crustal tectonic earthquake of the mainshock variety, followed by a series of aftershocks. The objective of this research is to conduct deformation mapping before and after the Cianjur Magnitude 5.6 earthquake. The research employs remote sensing technology, specifically interferometric synthetic aperture radar (InSAR), in conjunction with global navigation satellite system (GNSS) analysis techniques. The results have yielded valuable insights into the spatial distribution of vertical tectonic deformation through InSAR and GNSS analysis, revealing that the co-seismic deformation reached a maximum value of 5.87 cm, concentrated in the Cugenang sub-district. In contrast, GNSS station data recorded co-seismic deformation of 4.6 cm and horizontal deformation of approximately ±12 cm, directed southeastward. These findings indicate that aftershocks had a more significant impact on deformation in the Cianjur region, particularly around the Cugenang fault area. Variations in the source of the main earthquake and subsequent aftershocks substantially influenced deformation patterns and the direction of horizontal deformation.
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Copyright © 2008 Department of Geology, Faculty of Science, Chulalongkorn University. Parts of an article can be photocopied or reproduced without prior written permission from the author(s), but due acknowledgments should be stated or cited accordingly.
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