Abstract
Volcanic earthquakes of mount Merapi have been investigated periodically. The investigation aims to determine the hypocenter and epicenter of mount Merapi's volcanic earthquake using wave polarization analysis. The analysis was carried out in three domains, which are the time domain, the frequency domain, and the space domain. The analysis in the time domain was conducted by the arrival time of the volcanic earthquake, and the analysis in the frequency domain was done by observing the spectrum to get information on source frequency and bandwidth passed from polarization analysis, while the analysis in the space domain was conducted especially on hypocenter determination of the volcanic earthquakes. The analysis leads to the frequency of source 6 Hz and a bandwidth of 0.1 Hz. Thus, the hypocenter of volcanic earthquakes by polarization analysis was distributed to depth from 670 m to 3250 m from Merapi's top
Highlights
Mount Merapi slopes spread in the various districts of Magelang, Boyolali, Klaten, and Yogyakarta
If the arrow of back azimuth and angle of incidence of the volcanic earthquake are extended, they will find the hypocenter and epicenter of the volcanic earthquake. If this projection line goes to the earth's surface, it will find the volcanic earthquake's hypocenter
Volcanic earthquake recording data from the seismometer consists of 3 directional components, which are vertical (Z), North-South (N), and East-West
Summary
Mount Merapi slopes spread in the various districts of Magelang, Boyolali, Klaten, and Yogyakarta. Besides being recorded as the most active volcanoes in the world, it has many physical phenomena that are difficult to observe, such as sound wave symptoms (acoustic) and symptoms of deformation (shape changes) [1]. Apart from these two symptoms, there are still physical quantities correlated with the volcano's internal dynamics, including changes in geomagnetic fields, geoelectric fields, and temperature. For modeling, determining volcanic activities' status and forecast often used seismic symptoms and deformation without ignoring other symptoms [2]. This research succeeded in determining the polarization parameters (reverse azimuth and angle of incidence)
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