Determination of Fault Type of Lombok Earthquakes from July 1 to December 31, 2018, using Focal Mechanism Method
Abstract
Research has been conducted on determining the type of fault in Lombok earthquake on July 1 to December 31 2018 using the focal mechanism method. The focal mechanism is a method of reviewing fault parameters that include strike, dip and rake based on the initial movement direction of P wave recorded by the station, which then projected into a focal ball. There are 246 stations are used in several countries. There were 139 earthquakes with M?4.0 on July 1 to December 31 2018, at coordinates 7.0? S-9.0? S and 115.5? E-117.5? E. The result of fault field parameters is at nodal 1 strike=52?-149?, dip=6?-75?, rake=39?-143? and at nodal 2, strike=233?-313?, dip=18?-84?, rake=58?-119?, then projected into focus ball. Based on these results shows that earthquakes occur as a result of thrust fault movement.
Downloads
References
[2] M. Ridwan, D. Arbiyakto, Y. Megantara, et al., Kajian Rangkaian Gempa Lombok Provinsi Nusa Tenggara Barat, Pusat Penelitian dan Pengembangan Perumahan Pemukiman, 2018, pp. 3
[3] N. Diaz, Relokasi Gempabumi di Pulau Bali Bagian Utara Tahun 2015-2017 dengan Menggunakan Metode Double Diffrence (DD), Skripsi, Program Studi Fisika Faluktas Matematika dan Ilmu Pengetahuan Alam Universitas Udayana, 2018.
[4] H. E. Putra, Gemuruh di Lombok Palu dan Donggala Senyap di Selat Sunda, PT Reasuransi MAIPARK Indonesia, 2019, pp. 1
[5] Daryono, Identifikasi Sesar Naik Belakang Busur (Back arc thrust) Daerah Bali Berdasarkan Seismisitas dan Solusi Bidang Sesar, Artikel Kebumian, BMKG, 2011, pp. 1
[6] W. Prawirodikromo, Seismologi Teknik dan Rekayasa Kegempaan, Pustaka Pelajar Yogyakarta, 2012, pp. 160
[7] M. Utami, Analisis Mekanisme Pusat Gempa Soroako, Skripsi, Program Studi Fisika Fakultas Sains dan Teknologi Universitas Islam Negeri Syarif Hidayatullah, 2011.
[8] T. Ismawati, Mekanisme Fokus Gempabumi Mentawai, Skripsi, Program Studi Fisika Fakultas Sains dan Teknologi Universitas Islam Negeri Syarif Hidayatullah, 2011.
[9] F. A. Mubarok, Estimasi Momen Tensor dan Pola Bidang Sesar Amerika Serikat Pada Tahun 2016-2017 dengan Inversi Waveform Tiga Komponen dengan Program ISOLA, Skripsi, Program Studi Fisika Fakultas Ilmu Alam Institut Teknologi Sepuluh Nopember, 2017.
[10] D. Harmadhoni, Analisis Mekanisme Fokus Gempabumi di Blitar-Jawa Timur 17 Mei 2011, Skripsi, Program Studi Fisika Fakultas Sains dan Teknologi Universitas Islam Negeri Syarif Hidayatullah, 2011.
[11] P. Supendi, Identifikasi Sesar Aktif di Jawa Barat Bersadarkan Penentuan dan Relokasi Hiposenter serta Mekanisem Fokus Gempabumi, Tesis, Program Studi Megister dan Sains Kebumian Institut Teknologi Bandung, 2016.
[12] P. M. Shearer, Introduction to Seismology, Cambridge University Press, 2009, pp. 256.
