| Summary: | Ministry of Energy and Mineral Resources of Republic of Indonesia (ESDM) state Timbang crater is more
dangerous than Sileri crater. In 1979 Timbang crater had released a poison gas that caused 48 people died.
This because the location of crater is near from the residential area and also has a high gas content of CO2,
H2S, and SO2. Therefore this study aims to delineate the area into the zone of the release of toxic gases.
The method used is multivariate kriging by interpolating 20 samples of Boron, pH, temperature data and
NDVI. Exploratory Data Analysis (EDA) and Exploratory Spatial Data Analysis (ESDA) are done to
make sure the data are acceptable to be analyzed. Multivariate analysis shows that higher to lower
correlation are between temperature and boron with value 0.426753, temperature and boron with value
0.330846, also NDVI and boron with value 0.256543. The data support of interpretation that temperature
is the most effectable parameter of poisonous gas manifestation, boron elements positively support life of
vegetation around Timbang Crater, and temperature positively makes boron has more energy to go out
through manifestation. Next, each parameter of data is interpolated using ordinary krigging with spherical
model as semi-variogram in certain lag, nugget and kurtosis value. Semi-variogram of each parameter is
used to make the map. Map of pH, temperature, NDVI and Boron Element are united to make the map of
poisonous manifestation around Timbang crater using Raster Calculator with scoring based on result of
multivariate analysis. Based on the final map, it shows that from north and east part of Timbang crater is
the most dangerous area which produces manifestation of poisonous gas, so to mitigate this disaster there
should be special treatment of that area.
Key words : timbang Crater, NDVI, Multivariate Kriging, Poison
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