University of Twente Student Theses


Seismicity in Java, Indonesia: spatial & temporal study using fractal dimension & b-value

Ramadhani, Ayu Litang (2012) Seismicity in Java, Indonesia: spatial & temporal study using fractal dimension & b-value.

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Abstract:The study about earthquake and seismic activity, from time to time has been developing. Despite of so many efforts to mitigate, to assess, to reduce the risk, or even to forecast earthquake, it still considered as a random and unpredictable events. Some research examined earthquake data in order to determine the similarity of the time and spatial pattern of seismic activity in tectonic zone. Self similar pattern which is the property of fractal geometry, can be measured, and later will be defined in a value of dimension. Box-counting and correlation integral are common used as the method of space covering. An area being observes its fractal dimension using sliding windows with different cell size. It determines the relationship between the numbers of non-empty cells of different cell size inside the region of space. At one fractal dimension may change with the epicenters cluster or fault location. Temporal change in fractal dimension, the time interval between two events of the same magnitude is approximately proportional to the magnitude of the event. Another fractal property can be found in frequency-magnitude relation in Guttenberg-richter law. It estimated best using Maximum-likelihood. Using data which heterogeneous, can caused temporary change in data frequency. To avoid this effect, it is necessary analyzing lower limit magnitude of an earthquake catalogue to get homogenous data set. The magnitude of completeness of the study area found to be 5,5 Mw. And the relation between fractal dimension and b-value are both positive and negative. Keywords: fractal, b-value, box-counting, correlation integral, seismicity
Item Type:Essay (Master)
Faculty:ITC: Faculty of Geo-information Science and Earth Observation
Programme:Geoinformation Science and Earth Observation MSc (75014)
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