ANALISA VERTICAL TOTAL ELECTRON CONTENT DI IONOSFER DAERAH JAWA DAN SEKITARNYA YANG BERASOSIASI DENGAN GEMPABUMI YOGYAKARTA 26 MEI 2006 UTC

Abstract

Earthquake that struck Jogjakarta on May 27 2006 (local time) gives negative impact to life and it became of no awareness disaster. Previously, there are many researches that developed a system which can give signal to earthquake pre-detection. One of them is Seismo-Ionosperic Coupling. This research, explain phases in Ionospere before and after shock.Electron densities in vertical direction in Ionospere (Vertical Total Electron Content) is selected as parameter. Total Electron Content (TEC) is defined as the amount of electron in vertical column (cylinder) with cross-section of 1 m 2 along GPS signal trajectory in Ionospere at arround 350 km of height.There are three times of significant decrease of VTEC value in Java and its surrounding, i.e. at 18, 20, 22 of May 2006. However, after corrected by Dst Index, the decrease VTEC value on May 18 2008 has relationship with magnetic disturbance. The decrease of VTEC value on May 20 and May