Coulomb stress analysis of West Halmahera earthquake mw=7.2 to mount Soputan and Gamalama volcanic activities

10th Aceh International Workshop and Expo on Sustainable Tsunami Disaster Recovery

Sinaga, G.H.D.^1 ; Zarlis, M.^2 ; Sitepu, M.^1 ; Prasetyo, R.A.^3 ; Simanullang, A.^3

Post Graduate Program, Physics Department, University of Sumatera Utara, Bioteknologi No.1 USU, Medan, North Sumatera, Indonesia^1

Ilkom-TI Faculty, University of Sumatera Utara, University No.9A USU, Medan, North Sumatera, Indonesia^2

BMKG Balai Besar Wilayah i, Jl. Ngumban Surbakti No.15 Medan, North Sumatera, Indonesia^3

关键词: Convergency;    Coulomb stress;    Earthquake magnitudes;    Eurasian plates;    Focal mechanism;    Input models;    Philippines;    Volcanic activities;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/56/1/012005/pdf
DOI  :  10.1088/1755-1315/56/1/012005

来源: IOP

【 摘 要 】

West Halmahera is the convergency of three plates, namely the Philippines plate, the Eurasian plate, and the Pasific plate. The location of the West Halmahera is located in the thress plates, so the Western Halmahera potentially earthquake-prone areas. Some events increased activity of Mount Soputan and Mount Gamalama preceded by a massive earthquake. This research was conducted in the BMKG Region I Medan. This research uses Coulomb Stress Model. Coulomb Stress Model was used to show increasing and decreasing stress consequence from earthquake in the area of West Halmahera. Data such as the earthquake magnitude, earthquake depth, and Focal Mechanism required as input models. The data obtained from BMKG, Global CMT, and PVMBG. The result of data analyzed show an increase in the coulomb stress distribution at Mount Soputan 0.023 bar and 0.007 bar in mountain Gamalama. This stress followed by increased volcanic activity of the mount Soputan and mount Gamalama with freatic eruption type.