Earthquake effect on volcano and the geological structure in central java using tomography travel time method and relocation hypocenter by grid search method

Relocating hypocenter is a way to improve the velocity model of the subsurface. One of the method is Grid Search. To perform the distribution of the velocity in subsurface by tomography method, it is used the result of relocating hypocenter to be a reference for subsurface analysis in volcanic and m...

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Bibliographic Details
Published in:Journal of physics. Conference series 2016-11, Vol.776 (1), p.12117
Main Authors: Suharsono, Nurdian, S. W, Palupi, I. R.
Format: Article
Language:English
Subjects:
Crystal lattices
Earthquakes
P waves
Physics
Relocation
Search methods
Subduction (geology)
Tomography
Travel time
Velocity
Volcanic activity
Volcanoes
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Summary:Relocating hypocenter is a way to improve the velocity model of the subsurface. One of the method is Grid Search. To perform the distribution of the velocity in subsurface by tomography method, it is used the result of relocating hypocenter to be a reference for subsurface analysis in volcanic and major structural patterns, such as in Central Java. The main data of this study is the earthquake data recorded from 1952 to 2012 with the P wave number is 9162, the number of events is 2426 were recorded by 30 stations located in the vicinity of Central Java. Grid search method has some advantages they are: it can relocate the hypocenter more accurate because this method is dividing space lattice model into blocks, and each grid block can only be occupied by one point hypocenter. Tomography technique is done by travel time data that has had relocated with inversion pseudo bending method. Grid search relocated method show that the hypocenter's depth is shallower than before and the direction is to the south, the hypocenter distribution is modeled into the subduction zone between the continent of Eurasia with the Indo-Australian with an average angle of 14 °. The tomography results show the low velocity value is contained under volcanoes with value of -8% to -10%, then the pattern of the main fault structure in Central Java can be description by the results of tomography at high velocity that is from 8% to 10% with the direction is northwest and northeast-southwest.
ISSN:1742-6588
1742-6596
DOI:10.1088/1742-6596/776/1/012117