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.
Highlights
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
Hasilnya adalah pengelompokan dari take off angle dan azimuth yang memisahkan antara daerah kompresi dan dilatasi, yang diproyeksikan ke dalam bentuk bola fokus
Introduction to Seismology, Cambridge University Press, 2009, pp. 256
Summary
Gelombang P merupakan gelombang badan yang menjalar dalam tubuh bumi. Gelombang ini dapat merambat pada media padat, cair (air, magma) dan gas atau udara. Gerakan gelombang ini searah dengan rambatan gelombang, sehingga elemen batuan kadang-kadang mampat (compression) dan merenggang (dilatation). Gelombang ini mempunyai kecepatan yang lebih tinggi dibandingkan dengan gelombanggelombang lainnya dan yang pertama tercatat oleh seismograf [6]
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