Friday, March 12, 2010

Landslide In Cianjur, West Java

Another devastating landslide has occurred in West Java, following Ciwidey landslide that were happened 18 days before. The landslide occurred at Kampung Ciawi Tali, Cianjur, West Java Province on Thursday, 11 March 2010 at 6.30 pm. Seven people were confirmed dead and four others still buried under the debris and subject for search and rescue. At least 20 houses and school damaged and 100 people have been evacuated.

The prominent factors of landslide in Indonesia are lithology and morphology. Highly weathered material can be easily found in Indonesia. If it occurred on the steep morphology and water penetrate into the material, it will weaken the slope and increase the potential of mass movement as it cross the threshold. The increasing of precipitation rate during the late monsoon season should raise alert of the potential similar hazard near in the future. People living on unstable areas should be warned, prepared and trained to face it. A map of the susceptible-to-landslide area are available for most of Indonesian region (low resolution of the West Java image can be found here), that the government, from high to low level should be familiarize themselves with this map and socialized it to the people in the area. As published before in this website, applying a simple-low cost early warning system could be considered to reduce the causalities of landslide at high susceptible area, if relocation is not possible.

Friday, March 5, 2010

Magnitude 6.5 Earthquake, Southwest of Sumatra

A magnitude-6.5 earthquake struck the western shore of Indonesia's Sumatra island on Friday, March 05, 2010 at 11:06:57 PM. The epicenter located offshore at 4.032°S, 100.806°E at 22 km depth, about 165 km (100 miles) West of Bengkulu and 345 km (215 miles) South of Padang, Sumatra. This event causing panic but no casualties or damage yet reported. No tsunami potential being issued.

Epicenter location on Google Earth map

Moment tensor solution for this event can be found here.
Base map (topographic map scale 1:10.000) of Padang, Jambi, Bengkulu and surrounding area can be found here.