A Comparison Of Gravity Filtering Methods Using Wavelet Transformation And Moving Average (A Study Case Of Pre And Post Eruption Of Merapi In 2010 Yogyakarta, Indonesia)
Journal Title: IOSR Journal of Applied Geology and Geophysics (IOSR-JAGG) - Year 2018, Vol 6, Issue 3
Abstract
Merapi had a big eruption in 2010. This eruption caused a change in its mass distribution. The changes of mass distribution can be identified by the local and regional anomalies of gravity data. The separation of local and regional anomalies can be done by applied a data filtering method using wavelet transformation and moving average. The assumed data are used is a 2-period data with a separate distribution. A comparison between two methods is used to obtain a more detailed anomaly separation. The result are wavelet transformation method able to separate the local anomaly more detail than the moving average method. Anomaly value in wavelet transform method is ranging between 1.0 mGal to 2.8 mGal while moving average method is ranging between 0.2 mGal to 2.2 mGal. A higher anomaly value indicates an increase of density variation. Local anomalies that appear in the pre and post-eruption of 2010 are located to the southeast part of the Merapi’s peak supposed as its reservoir and other gravity anomalies in the northwest are suspected as lowdensity regions.
Authors and Affiliations
Rina D Indriana1* ,, Kirbani S. Brotopuspito, 2 , Ari Setiawan, Tarcisius A Sunantyo 3
Keywords
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A Comparison Of Gravity Filtering Methods Using Wavelet Transformation And Moving Average (A Study Case Of Pre And Post Eruption Of Merapi In 2010 Yogyakarta, Indonesia)
Merapi had a big eruption in 2010. This eruption caused a change in its mass distribution. The changes of mass distribution can be identified by the local and regional anomalies of gravity data. The separation of local a...