Earthquake Characteristics of Mount Semeru Eruption, East Java Year 2009

Cholisina Anik Perwita, Sukir Maryanto, Agus Budianto

Abstract


Type of eruption during the year 2009 can be classified into three types. Type I is a visual explosion that manifested by the eruption of contain volcanic material. Type II is the eruption of the manifestated by fog. Type III is the eruption that occurred during lava dome growth. Spectral and hypocentre analysis has been done used four seismic stations Kepolo (KPL), Leker (LEK), Tretes (TRS) and Besuk Bang (BES). From the analysis found that the correlation between visual eruption and frequency indicates that the seismic eruptions have type I has a frequency 0.87 to 3.8 Hz frequency, seismic eruption of type II has a frequency 0.87 to 2.64 Hz frequency, while the seismic eruptions type III  has a frequency 1.06 to 2.73 Hz. Result of study shows hypocenter is located at a depth of 0.90-1.47 km below the crater, interpreted as shallow magma pockets. Described based on the seismicity of 2009. Activities eruption caused by changes of pressure in deep and shallow magma pockets. The eruption process is more controlled by increase of pressure in the shallow magma pockets


Keywords


explotion earthquake, Semeru volcano, frequency, hypocenter

Full Text:

PDF

References


Maryanto, S. (1999), Analysis of Seismic Signal of Mt Semeru (East Java, March 1st-21st, 1988) In Order to Determine It’s Source and Eruption Mechanism, Thesis, Universitas Gajahmada, Yogyakarta.

Siswowidjoyo, S. Djoko Santoso, Untung Sudarsono, Surono (1995), Laporan Final Riset Unggulan Terpadu I 1993/1994 dan 1994/1995, Penelitian Mekanisme Letusan G. Semeru di Jawa Timur dan Evaluasi Daerah Bahayanya, Dewan Riset Nasional dan Proyek Pusat Pengembangan Ilmu Pengetahuan dan Teknologi, Bandung.

Kirbani, S.B., Fadeli, A. Wahyudi, Imam, S. Ari, S. (1992), Laporan Penelitian, Studi Pendahuluan Seismisitas Gunung Semeru, Jawa Timur, FMIPA, UGM, Yogyakarta, Indonesia.

Perwita, Cholisina A. (2011), Analisis Sinyal Seismik Gempa Letusan Gunung Semeru, Jawa Timur Tahun 2009, Skripsi Fakultas MIPA Universitas Brawijaya, unpublished.

Iguchi, M. Hendrasto. M, Hirabayashi Jun-ichi (2007), Eruption mechanism of explotion at Semeru Volcano, East Java, Indonesia.

Susilo, A. (1997), Analisis Sinyal Seismik Gunungapi Semeru (Jawa Timur, Desember 1993 – Februari 1994) dengan Dekonvolusi Homomorfik untuk Menentukan Mekanisme Sumbernya, S-2 Tesis, Program Studi Fisika, Jurusan Ilmu-ilmu Matematika dan Pengetahuan Alam, Pasca Sarjana, Universitas Gadjah Mada. Yogyakarta.




DOI: http://dx.doi.org/10.21776/ub.natural-b.2012.001.03.6

Refbacks

  • There are currently no refbacks.