IJOG : Indonesian Journal on Geoscience
Vol 7, No 1 (2020)

Locating Tremor Source with Polarization and Semblance Methods During the 2014 Crisis Period of Raung Volcano

Vico Luthfi Ipmawan (Departement of Physics, Institut Teknologi Sumatera)
Kirbani Sri Brotopuspito (Departement of Physics, Universitas Gadjah Mada)
Hetty Triastuty (Centre for Volcanology and Geological Hazard Mitigation, Geological Agency)



Article Info

Publish Date
17 Jan 2020

Abstract

DOI:10.17014/ijog.7.1.41-49Raung is a basaltic-andesitic volcano with strombolian-type eruptive activity located in East Java Province, Indonesia. The seismic activity of this volcano increased on 11th November 2014 which was dominated by tremors. Due to the difficulty to distinguish the onset of body waves of tremor waveform, polarization and semblance methods were proposed and applied to locate the tremor source. The tremors recorded during November to December 2014 were analyzed. The results showed that the back-azimuth values obtained by the polarization method were around N 288o - 324o E in accordance with the direction of Raung summit, while the incidence angle ranged around N 81o - 89.3o E. The semblance method was performed on 2 x 2 km area around the summit. The result of the tremor source showed the distribution of epicentre extending N52o E to the northeast direction about ±2.1 km away from the Raung summit.

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Journal Info

Abbrev

IJOG

Publisher

Subject

Earth & Planetary Sciences

Description

The spirit to improve the journal to be more credible is increasing, and in 2012 it invited earth scientists in East and Southeast Asia as well as some western countries to join the journal for the editor positions in the Indonesia Journal of Geology. This is also to realize our present goal to ...