Abstract
This study uses data provided by BMKG Indonesia which is downloaded from the website www.webdc.eu. The data processing is done by using some software, one of them is Matlab to run Isola software. The software provides information about the fault direction. In addition, this study also uses Coulomb 3.3 software to provide information on subsequent earthquake forecasts. The results showed that the earthquake that occurred on 27th February 2015 gave impact to Coulomb's increase and decrease of stress to some areas in the northern mainland of Flores. The impact of this major earthquake is expected to trigger an earthquake that occurred in northern Flores. Based on the results of data processing obtained form focal mechanism is oblique reverse with the first nodal value strike 139, dip 73, and rake 50. While on the second nodal has a strike value 30, dip 43, and rake 154. Main earthquake impact Coulomb stress increase of 0.15-0.2 bar. Meanwhile, Coulomb stress result obtained shear value -18.890, normal -0.217, and Coulomb -19.976 .
Highlights
This study uses data provided by BMKG Indonesia which is downloaded from the website www.webdc.eu
The data consist of earthquake events for at least 4.8 SR occurred on coordinates of 7.020 ̊ 10,210 ̊ South Latitude and 118,030 ̊ - 124,750 ̊ East Longitude
The data picking processed by using VELEST software to get model of local earth velocity
Summary
This study uses data provided by BMKG Indonesia which is downloaded from the website www.webdc.eu. The results showed that the earthquake that occurred on 27th February 2015 gave impact to Coulomb's increase and decrease of stress to some areas in the northern mainland of Flores. Flores Thrust is known as a destructive earthquake generator that will constantly threaten to shake the arch of the archipelago. This fault became very popular because on 12 December 1992 caused the Flores earthquake followed by tsunami tidal wave that killed 2,100 people. Eastern segmentation fault is known as Wetar rising fault (Wetar thrust) that stretches from north of Alor island to Romang island This structure is no less dangerous than Flores thrust in terms of producing large earthquakes and damaging the area of NTT.
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