A Preliminary Result: Characteristic and Mechanism of Deep earthquake in Java subduction zone Aditya Rahman (a)(c)(*), Afnimar (b), Yusuf Hadi Perdana (c), Aprilia Nur Vita (c), Supriyanto Rohadi (c), Nelly Florida Riama (c)
(a) Master Program of Earth Sciences, Faculty of Earth Sciences and Technology, Institut Teknologi Bandung, Bandung, Indonesia
(b) Global Geophysics Research Group, Faculty of Mining and Petroleum
(c) Agency of Meteorology, Climatology and Geophysics (BMKG), Jakarta, Indonesia
(*) Email : ad.rahman29[at]gmail.com
Abstract
The occurrence of deep-focus earthquakes is unusual and has become one of mysterious seismic phenomena. The behavior of deep earthquake occurrence is still poorly understood. The geodynamical process of a deep earthquake must have a fundamental difference of physical processes from a shallow or intermediate earthquake. There are two main processes of deep earthquake occurrence, water infiltration into the subduction zone (dehydration embrittlement) and transformational faulting of metastable olivine. In Indonesia, the Java subduction zone is known as the deep earthquake source region. We will present preliminary results from the study of characteristic and geodynamical processes of deep earthquake events We use earthquake data within the Java subduction zone with magnitude M > 6 and deeper than 60 km from 2010-2020. We relocate earthquakes hypocenter using Double Difference method, apply moment tensor inversion to obtain earthquake focal mechanism then classify and grouping the earthquake.
Keywords: deep earthquake, java subduction, dehydration embrittlement, metastable olivine
