[G04-4] Earth rotation and geodynamics IV

[G04-4-04] Distribution of interplate coupling in the south of Central and Eastern Java from GPS observation

^○Irwan Meilano¹, Endra Gunawan¹, Dina Sarsito¹, Rahma Hanifa¹, Bambang Setyadji¹, Hasanuddin Abidin¹, Susilo Susilo² (1.Faculty of Earth Science and Technology, Institut Teknologi Bandung, Indonesia, 2.Agency for Geospatial Information (BIG), Indonesia)

Java is one of the many islands at the Eurasian margin in Indonesia in which subduction has been an important influence on its tectonic condition. The subduction process or plate coupling at the Java Trench was considered to be weak. However, two tsunami earthquakes, accompanied by tsunamis have occurred off the south coast of Java, the 1994 Mw7.8 and the 2006 Mw7.8 earthquakes. Given the evidence of this earthquake, it is very important to have detail information of the interplate coupling in particular off the Central and Eastern .
Interplate seismogenic zones in the south of Central and Eastern Java were estimated by using campaign and continuous GPS observation. The observation period is strarting from 2008 to 2016. The GPS analysis indicates that present-day deformation in the south of Central and Eastern Java from is controlled by rotation of Sunda land, postseismic deformation of the 2006 earthquake and the coupling between Indo-Australian plate and Sunda land. The estimated interplate coupling in the Java trench is larger than 50 percent in the Central Java and become bigger to the East.