Application of Tomography Seismic for Subsurface Modeling of Kelud Mountain

摘要

Kelud is a Quaternary volcano formed by the collision between the Indo-Australian plate with the Eurasian plate, exactly in the south of Java. This volcano is included in stratovolcanoes type explosive eruption characteristics. In order observation of subsurface conditions, performed imaging tomography. The research used data recordings from the 4 point observation in 2007. The data processing started from the initial velocity modeling, ray tracing calculations using the method of bending and tomographic velocity model Vp, Vs and Vp/Vs using inversion techniques delay time. Based on the research activities carried out, were resulted velocity structure models Vp, Vs, Vp/Vs and the hypocenter distribution of volcanic earthquakes occurring in Kelud. Velocity structures of Vp and Vs with variations of negative values between -60 to 0% and the value of Vp/ Vs positive indicating the presence of hot fluid Kelud from top to sea level. While the positive values of Vs velocity structure between 0 to 20%, which dominate the east and south peaks interpreted as the rest of the frozen magma from previous volcanic activity.