| Summary: | Wall Cracks in a slope area with high landslide risk is very common. Triggered by small
horizontal land movement, relative movement of walls separated by the crack line to create wider
crack can occur. In the present work, an early warning system for landslide utilizing such movement
is presented. For this purpose, a bar is connected to the displacement sensor. Sensor is fixed to one
side of wall at either before or after crack line. The bar from this sensor is fixed to the other side of
the wall at the direction perpendicular to the crack. With this configuration, small movement of one
part of wall (before or after crack line) activate the sensor. In this paper, two displacement sensors
are used, i.e., displacement sensor based on slide resistor and fiber sensor. In the present work,
warning is given in the form of sound characterized the increase of frequency as the width of crack
increase.
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