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All Journal Jurnal Manajemen Kesehatan Yayasan RS.Dr. Soetomo Indonesian Physical Review Journal of Telenursing (JOTING) Jurnal Abdi Insani Cokroaminoto Journal of Primary Education Jurnal Sistem Informasi Universitas Dinamika International Journal of Innovation and Education Research Sipakaraya : Jurnal Pengabdian Masyarakat Eksplorium : Buletin Pusat Pengembangan Bahan Galian Nuklir
Indrawati, Yuni
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DEEP INTRASLAB DEFORMATION OFFSHORE NORTHERN JAVA REVEALED BY TIME-DOMAIN MOMENT TENSOR (TDMT) INVERSION Fahmi, Muhammad Nurul; Indrawati, Yuni; Realita, Arie; Madlazim, Madlazim
Indonesian Physical Review Vol. 9 No. 2 (2026)
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/ipr.v9i2.564

Abstract

This study investigates deep-focus intraslab deformation offshore Northern Java by analyzing two recent major earthquakes: 6 July 2020 (  6.67) and 14 April 2023 (  6.96), occurring at centroid depths of ~500–600 km. The objective is to constrain the source mechanisms and infer the prevailing deformation regime within the subducting Indo-Australian slab. We perform time-domain moment tensor (TDMT) inversion of broadband waveforms (GE/GEOFON network) using MTTime, with standard preprocessing (instrument correction and band-pass filtering) and Green’s functions computed from the 1-D ak135 velocity model. Centroid depth is refined via a grid search that maximizes waveform variance reduction (VR). The preferred solutions show good waveform agreement (VR = 82.0% for the 2020 event and 71.6% for the 2023 event) and are consistent with Global CMT solutions (Kagan angles = 7.04° and 6.31°, respectively). Both earthquakes exhibit oblique normal faulting with a persistent dextral strike-slip component, indicating a dominantly extensional stress regime at depth, likely driven by slab pull/gravitational sinking, while the consistent trench-parallel shear suggests more complex internal slab deformation. These results provide quantitative constraints on deep intraslab kinematics beneath Java and motivate expanded event sampling for a more robust regional interpretation.
Co-Authors Alhakim, Euis Etty Bondan, Abimanyu Eko Rudi Iswanto Fahmi, Muhammad Nurul Fatma Nadia Ferianto Ferianto Halisa, Nur Julianto Lemantara Kasmaini Kurnia Anzhar Kurnia Lestari, B. Farhana Kusnowo, Syahroni Bayu Madlazim Madlazim Muh amin Nabhila, Ridha Nur Rande, Silva Realita, Arie Rifa Yanti Riyanto, Theo Alvin Setiawan, Muhammad Anggri Solihat, Sufiana Sukriana, Sukriana Sulistiowati Sulistiowati Tri Ananda Wahyuli, Nur Wilyah, Wahdaniyah Wira Ekdeni Aifa Zaenal Arifin