Geological structure analysis in Central Java using travel time tomography technique of S waves

8th International Conference on Physics and its Applications

Palupi, I.R.^1 ; Raharjo, W.^1 ; Nurdian, S.W.^1 ; Giamboro, W.S.^1 ; Santoso, A.^1

Geophysical Engineering, Universitas Pembangunan Nasional Veteran Yogyakarta, Jln. SWK 104, Condongcatur, Sleman Yogyakarta, Indonesia^1

关键词: Direction of movements;    Geological structures;    Heterogenity;    Sub-surface imaging;    Subduction zones;    Travel time tomography;    Wave forms;    Wave velocity;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/776/1/012112/pdf
DOI  :  10.1088/1742-6596/776/1/012112

来源: IOP

【 摘 要 】

Java is one of the islands in Indonesia that is prone to the earthquakes, in south of Java, there is the Australian Plate move to the Java island and press with perpendicular direction. This plate movement formed subduction zone and cause earthquakes. The earthquake is the release of energy due to the sudden movement of the plates. When an earthquake occurs, the energy is released and record by seismometers in the waveform. The first wave recorded is called the P waves (primary) and the next wave is called S waves (secondary). Both of these waves have different characteristics in terms of propagation and direction of movement. S wave is composed of waves of Rayleigh and Love waves, with each direction of movement of the vertical and horizontal, subsurface imaging by using S wave tomography technique can describe the type of the S wave through the medium. The variation of wave velocity under Central Java (esearch area) is ranging from -10% to 10% at the depth of 20, 30 and 40 km, the velocity decrease with the depth increase. Moho discontinuity is lies in the depth of 32 km under the crust, it is indicates there is strong heterogenity in Moho.